SAILING VESSEL DYNAMICS: INVESTIGATIONS INTO AERO-HYDRODYNAMIC COUPLING by GRAHAM TABER SKINNER Brown University (1975) AB. B.M.E., The Catholic University of America (1980) Submitted in partial fulfillment of the requirements for the degrees of Master of Science in Naval Architecture and Marine Engineering and in Mechanical Engineering at the MASSACHUSETTS INSTITUTE OF TECHNOLOGY June 1982 f, Graham T. Skinner The author hereby grats to distribute copies of to .I.T, permission to reproduce and nii'doqumenV/X whole or in part. Signature of Author DOpartment of O0ean Engineering Certified By J-tip ,wIn Accepted By E. Kerwp, Thesis Supervisor R enovl-Thesis Reader A. Dougtas Carmichael, Chairman Departmental Committee on Graduate Students, Department of Ocean Engineering -la- SAILING VESSEL DYNAMICS: INVESTIGATIONS INTO AERO-HYDRODYNAMIC COUPLING by GRAHAM TABER SKINNER Submitted to the Department of Ocean Engineering and Mechanical Engineering, June 1982 in partial fulfillment of the requirements for the degrees of Master of Science in Naval Architecture and Marine Engineering, and Master of Science in Mechanical Engineering. ABSTRACT An investigation was undertaken of the extent to which the motions and added resistance of a vessel sailing in waves could be attenuated by the aerodynamic damping of sails. The analysis used quasi-steady inviscid lifting line and lifting surface approaches to the aerodynamic problems. The primary focus was the attenuation of added resistance by aerodynamic pitch damping, which was 14% for an example. The value depended strongly on the viscous drag. In addition, it was shown that pitching can increase the driving force slightly and that rolling is overdamped by aerodynamics. Thesis Supervisor: Title: Justin E. Kerwin Professor of Naval Architecture -2- ACKNOWLEDGMENTS The author wishes to thank Professor M. Triantafyllou for his helpful hints and Professor J.E. Kerwin and Professor J. Milgram for providing the direction which was needed to conclude this investigation. Thanks also to Professor Hedrick for his advice and encouragement. I am grateful for the excellent typing service provided by Jessa Frankel, Joanne Sullivan and Marilyn Staruch. -3- 'CONTENTS ..... Page . . . . . . . . . . . . . . . . . . . . . . . -9 1 Abstract . . . . . . . . . . . . . . . . . . . . . . * la 0 * 2 . . . . . . . . . . . . . . 0 * 3 . . . . . . . . . . 0 5 . . 0 4. . . . . . . * 0 * * Title . . . . . . . . . Acknowledgements Contents . . . . . . Nomenclature . . . . . . . . . I I'I II'I IIV V fI VIII VI]I IX X . . Introduction . . . . . . Formulation of the Problem . . . 8 11 The Effect of Vessel Motions on the Apparent Wind Derivation of the Linearized Aerodynamic Pitch Damping Coefficient . . . . . . . . . . . ..... . 12 Approximate Calculation of the Aerodynamic Pitch Damp ing Coefficient Using Lifting Line Theory . . .. . . . 15 . . . 17 a·· 24 Numerical Modeling of Sail . . Seakeeping Reduced Frequencies . . . . . . . . . . . . . . . . . . . · · · 28 The Effect of Aerodynamic Pitch Damping on Added . . . . . . . . . Resistance Due to Pitching 30 . . 32 The Effect of Pitching on the Average Drive Force . . . XI Other Motions: Roll ... XII Other Motions: Surge, Sway, Heave, Yaw XIII Other Motions: Pitch Coupling . . . · · 0 0 · 0 * 0 · 0 · · · e* * XIV 7 0 . References . . . . . . .. . . . . . * 0 * 0 Appendices: 39 40 0 0 . . . . . .. Conclusions 33 . * * 8 · o· · · · · · · · · · 41 43 · 1. Rough Calculation of Aero Pitch Damping 56 2. Explanation of Program Cyclone 58 3. Transformation · · of PSF2 Output 63 · o· 4. PSF2 Output . . . . . . 65 · 5. MIT 5-D Output . . . . . . . . · · · 86 -4- LIST OF FIGURES Page .. . . 45 1. Sstems .. Vessel-ixedCoordinate 2. Wind Triangle 3. Sailplan for Lifting Line Analysis 4. Geometry for Lifting Surface Analysis . . . . ...... . . . .. . .... 46 47 48 -5- NOMENCLATURE a Wave amplitude Aj Added mass coefficients A Aspect ratio s2/S c Chord CD = D/ Cji - SVA Drag coefficient Hydrostatic restoring force coefficients CL = L/- p SV~ Lift coefficient d Vertical distance between hub surface and center of lateral resistance D Drag Force Fji Exciting force (or moment) in jth direction due to motion in in ith direction, i, j = 1,2..6 Fn Froude number v/vji FR Driving force Gj. Element of the generalized mass matrix GM Metacentric height GRAD Vertical true wind gradient, sec k Reduced frequency L Lift force n Propeller rpm 1 L,M,N Aerodynamic moments corresponding to i = 4,5,6 p,q,r Aerodynamic notation equivalent to RHUB Radius of Propeller HUB s Span S Sail planform area t Time x4, x5, x6 -6- T Period of oscillation VA Apparent wind velocity VB Steady (average) vessel velocity XCAM Ratio of Maximum camber of section to chord ~X Displacement in jth direction (surge, sway, heave, roll, pitch, yaw) ; YVessel velocity in ith direction a Apparent wind angle to vessel centerline A Displacement AF1 Added resistance Y True wind angle to vessel centerline X Leeway angle between course and vessel centerline P Density of fluid e Pitch angle (lbs.) Frequency of oscillation X Angle of incidence of waves (for head seas - 108° ) Damping ration between actual damping coefficient and damping coefficient required to just damp out oscillations Superscripts & Subscripts -A Aerodynamic -H Hydrodynamic -n Natural (frequency or period) -p Derivative with respect to p -q Derivative with respect to q -7- I. INTRODUCTION Analysis of sailing vessel performance in a seaway is complicated by the coupling of hydrodynamic and aerodynamic forces and motions. Performance of a vessel sailing in calm water has been analyzed by Kerwin 3. Behavior of a yacht hull moving through waves has been analyzed by Gerritsma and Moeyes 4 . A program has been written to combine these analyses for performance prediction for a vessel sailing in a seaway 5 , but neglects the contribution of the rig to the equations of motion. For downwind sailing results have been reported for studies hull-sail of interaction, such as the coupling between wave induced roll and wind induced sway moment, which can lead to the instability known as broaching 6 '7 For upwind sailing the possibility exists that aerodynamics provides substantial damping of wave excited motions. If so, then added resistance due to wave radiation should be less than that predicted by models which neglect this coupling. No investigations of this phenomenum are known to have been reported. Such an investigation was the primary purpose of this work. A corollary result of this work was the development of a program to facilitate the analysis of a single sail using numerical lifting surface techniques. Use of such techniques for sail design has been reported 1 , and such techniques have been used for wing and propeller blade analysis 8 However, no previous use of this technique for sail analysis is known. -8- II. FORMULATION OF THE PROBLEM Observation of the motions of vessels sailing in waves shows that pitch is the most severe motion and probably contributes most to added resistance due to wave radiation. These observations are supported by the results of the seakeeping analysis of a sailing vessel hull moving through waves, (see later chapter). Since pitch motions seem to make the largest contribution to added resistance, the initial and primary focus of this investigation was in:terms or the aerodynamic contribution to pitch damping. It is easiest to model this flow using quasi-steady inviscid theory 9 First, however the relative importance of viscous and unsteady effects must be evaluated. The most significant effect of viscosity is separation of the boundary layer from the sail surface. When this condition is severe the sail has -"stalled", and the effective mean camberline of the sail is so different from the actual sail shape that inviscid flow modelling based on the actual shape is invalid. Experiments have shown that stall occurs when the lift coefficient exceeds a value of about 1.9.2 For a sail of fixed shape the lift coeffi- cient varies with angle of attack. Then as long as the pitch induced change in angle of attack is small, separation is insignificant. Unsteady effects include periodic changes in sail shape. Because the sail is a flexible membrane, its shape is pressure distribution dependent. -9- When the angle of attack is "ideal" the fluid velocity at the leading edge is directed along the mean camberline at the leading edge. Below ideal angle of attack the pressure drop across the fabric at the leading edge will tend to deform (or "luff") the sail. For small pitch induced changes in angle of attack not much less than ideal, the change in sail shape due to luffing can be neglected. Unsteady effects also include periodic changes in the inviscid flow alone. Outside the boundary layer the flow is essentially inviscid. Here the vorticity must be constant so that vorticity must be shed into the flow as the lift coefficient varies. As this vorticity is convected downstream it changes the effective angle of attack. large with respect to the pitch rate, If the rate of convection is then this effect can be neglected. A measure of the importance of this unsteady effect is the reduced frequency, k TVA For small k unsteadiness of the flow can be neglected. The magnitude of all the effects considered above is proportional to the magnitude of the change of angle of attack due to pitch. small in high winds. This change is Since high winds generate the large amplitude waves which excite large pitch motions, the simplification of the problem to a quasi-steady inviscid analysis should be valid. Further assumptions, which will be repeated later as they are applied, are -1 0- (1) Heel, leeway are negligible for hydrodynamic motions, and (2) Groundplane, heel, boundary layer effects, aspect ratio, sail interaction, optimal sail trim are second order aerodynamic considerations. Two different approaches were taken to the evaluation of both the aerodynamic and hydrodynamic pitch damping coefficients. The first approach consisted of simple rough estimates. The second approach consisted of very accurate evaluations using numerical methods. -11- III. THE EFFECT OF VESSEL MOTIONS ON THE APPARENT WIND Two equivalent vessel fixed coordinate systems are given in Figure 1. The one without subscripts is usually used for analysis, the other for comparison of results. Sail interaction is neglected. Consider the effect of pitch and roll on the apparent wind. Assume axes of motion pass through center of waterplane area, (which is at least consistent with hydrostatic theory). Define the true and apparent wind angles y,B with respect to the vessel centerline. Then the local instaneous apparent wind is given by VA(pqz) = [(VTsiny - VBsinx - pz) + (VTcosy + VB q)]1/2 (1) and the instaneous apparent wind angle is o(p,q,z) = arctan[(VTsiny - VBsinx - pz)/(VTcosy + VBcosX + qz)] (2) -12- IV. DERIVATION OF THE LINEARIZED AERODYNAMIC PITCH DAMPING COEFFICIENT. Consider the linearized single degree of freedom equation for pitch motions: (G5 5 + A55 )q + B5 5 q + C 55 X5 = F5 sinwt (3) It can easily be shown that this is the truncated Taylor series expansion 18 about the equilibrium condition = q X=5 0 . The aerodynamic contribution, BA ,to the damping coefficient is to be determined. Taking the partial -55 derivative with respect to q yields BA -a5M- Mq (4) Now the moment of the aerodynamic force can be written M(q) =dM(q,z) (5) where for rigs of high aspect ratio and neglecting heel, the moment increment can be approximated by dM(q,z) = -z[dD(q,z)cosa(q,z)-dl(q,z)sin(q,z)] (6) where dD(q,z) = : P[VA(q,z)]2 c(z) dz C(q,,z ) (7) and dL(q,z) = Pp[VA(q,z)]2 c(z) dz C(q,z) (8) -13- Combining and (5) yields (4) BA5 =;(dM)q (9) S Combining (6), dM = implicitly (8) yields (7), Z zV 2 c dz(CDcos ADL (10) - CLsinB) + dependent on q, z. Taking the derivative (dM)q with respect to q: = -p -z V c dz(Cqcos -CLqsin This expression - CLsinS) z VA VAq c dz(CDcosS can be simplified. - CDsinB q + - CLcosS q) Note that (12) z cosB VAq (11) and -z sinB q at = 0. (13) VA Combining (11), (12), (13) and substituting into (9) yields for the linearized aerodynamic damping coefficient A - PVA 55 S cz2 [2CDCos2 3 + (CD + CLB)sin2B- 2(c L 2 ]dz + CDB)sin (14) -14Here VA and are found from the steady state and CD, CL, CL, in general vary with spanwise position, CDS may -15- V. APPROXIMATE CALCULATION OF THE AERODYNAMIC PITCH DAMPING COEFFICIENT USING LIFTING LINE THEORY Equation (14) was used to get a rough idea of the order of magnitude of the pitch damping coefficient for a 12-meter yacht. This example was chosen because data was already available in a useful form for calculation of the hydrodynamic coefficients of the 12-meter yacht "Valiant". Gross approximations to the lift and drag coefficients were made on the basis of diagrams in a handy reference11. Although no constraint was placed on the heeling moment, the lift coefficient was set low. the lift and drag coefficients were assumed to be spanwise Accordingly, constants, The lift coefficients were assumed to be CCL = 0,7 and (15) CL LO = 211 AA A+2 which would be correct for an elliptically loaded foil. To account for viscous drag the lift to drag ratio was assumed to be fairly low: L/D = 6 (16) whence CD = .1167 and4 CD8: Da CL TL (17) -1 6- The assumed sailing conditions throughout are VT = 20 knots VB = 8 knots 'y = 360 X = 40 (18) Then for steady state from (1) and (2) VA = 45 B fps = 29 ° (19) The damping coefficients were calculated for the typical mainsail and genoa jib shown in Figu The result obtained (in Appendix 1 2-meter Sail interaction was neglected. ) for the overall aerodynamic pitch damping was BA555 = 79,000 (ft-lb)/(rad/sec) -17- VI. NUMERICAL MODELLING OF SAIL An alternative and more accurate method than lifting line theory was desired for evaluation of aerodynamic pitch damping. A set of computer programs 1 0 for propeller analysis were available, and could be adapted to the analysis of a single sail by specifying a one bladed propeller. A very large ratio of hub radius to blade (sail) span was specified so that the helical nature of the geometry and wake was linearized on the sail and in the neighboring flow. The spanwise distributions of chord, camber, and twist, (see Figure 4), were specified. Precise relative displacements of the sections in the y, z directions (corresponding to dihedral and sweep) were neglected on the assumption that these caused only higher order effects. Heel was not modelled, on the assumption that the effect of heel is also analogous to sweep. The ground plane (water surface) was not modelled either. The programs only model lifting surfaces (not the propeller hub for example). These assumptions were justified by experience from modelling and testing propellers. Sail Specification and Design For the 12-meter used as an example, a sail was specified with the same span and area as a typical mainsail and jib combination so as to provide approximately the same forces and moments. For simplicity a sail with an untwisted planform equivalent to an isoceles triangle was selected. a = 0.8 mean camberlines2, It was also convenient to specify N.A.C.A. since they could be generated automatically by the program. The following sectional properties remained to be determined: (1) camber ratio, defined as the ratio of maximum camber to chord length, and (2) twist defined as the angle between the chord of the sail and the centerline of the vessel, so as to optimize the driving force subject to the constraint of maximum allowable heeling moment equal to 150,000 ft-lb. This limit was chosen because it corresponded to a maximum allowable heel angle of 30° and a 5,000 ft-lb righting moment per degree of heel. (This is the rate of righting moment generated by a 65,000 lb vessel with a GM = 4.4 ft). At this point it might have been convenient to design the optimum sail shape for these specifications by using the design program of Milgram1 . Instead an iterative approach using the analytical package was undertaken. This was a very expensive and time consuming procedure. As a practical approach to the problem, optimization of the driving force was interpreted as maximization of the lift coefficient. Also, the independent variables were subject to various constraints. -19- Twist was assumed to vary linearly with height. Observations1l that camber ratio, as well as twist, increases with height. indicated Furthermore, the package included a spline curve fitting routine which required a smoothly specified spanwise distribution of camber ratio. Finally, it was recognized that large pressure differentials across the leading edge could not be tolerated in the real flow, as indicated in Chapter I. The iterative procedure was complicated by (1) the presence of downwash, whose effect on the vertical distribution of load was hard to predict, and by (2) the extreme sensitivity of the leading edge pressure distribution to 18 the angle of twist. An attempt to design a suitable sail with a camber ratio of 0.11 was abandoned due to indications that such a sail could not meet the heel constraint without excessive luffing. -20- Finally a sail was found which came close to meeting all the design requirements. It should give a fairly good idea of the quasi-steady inviscid pitch damping. The Designer's Choice: (Also see Appendix ) Geometry: Area = 2320 ft2 Span = 80 ft. Camber Ratio = .075 to .095 Twist Angle = 11.5 ° to 29.5° Operating conditions as in (18), plus wind gradient Grad = 0.05 (ft/sec)/ft Performance: CL = 0.68 CD = 0.167 (including viscous drag coeff = 0.1) L = 159,000 ft-lb -21- Damping Coefficients: Damping coefficients were calculated using a simple finite difference method. For the design sail, approach velocities were perturbed to correspond to small changes from equilibrium in the rates of pitch, roll, and sway. Then the damping coefficients for the jth -[F( + - F(i Bji = i) force due th motion were )] Ak. Following linear theory these coefficients were evaluated for xi = 0, and Axi The velocity increment Axi was considered small enough if small. (1) Sectional lift coefficients were low enough for unseparated flow, (i.e. less than 1.9)2. (2) Bji(-Axi) Bji!(xi). Results: The damping coefficients for the designed sail were, for Pitch: BA 5 = 80,000 (ft - lb)/(rad/sec), BA (ft - lb)/(rad/sec), 55 Roll: = 700,000 -22- Sway: A B22 = 300 lb/(ft/sec), Pitch due to roll: BA = -350,000 (ft - lb)/(rad/sec), Pitch due to sway: BA2 = 7,000 (ft - lb)/(ft/sec). Summary of Results of Numerical Investigation of Aerodynamics: The results of the numerical analysis using vortex lattice techniques for realistic sail shapes confirmed the results of the approximation which assumed constant spanwise coefficients of lift and drag. damping coefficients were obtained. roll is probably the largest Additional These indicated that roll damping of aerodynamic contribution to damping. It is suprising to note that the damping of pitch by roll is very negative. However, this unusual coupling is not significant since roll is heavily damped. -23- In addition it was found (see Appendix 4 ) that when the viscous drag coefficient was decreased by 10% from 0.1 to 0.09 then the aerodynamic pitch damping coefficient was decreased by 20%. Next the hydrodynamic characteristics of this vessel are investigated, making it possible to determine (1) the relative values of the aerodynamics and hydrodynamic damping, and (2) the absolute value of the total damping. . .~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -24- VII. SEAKEEPING To quickly obtain a very rough idea of the order of magnitude of the hydrodynamic pitch damping coefficient published data14 was used to calculate the hydrodynamic pitch damping coefficient for a merchant vessel hullform. For a series 60 hullform of block coefficient 0.6, with water- line length of 50 feet, it was calculated that the hydrodynamic pitch damping coefficient would be about 500,000 (ft-lb)/(rad/sec). To obtain a more accurate value, the M.I.T. 5-D seakeeping program 15 was run using available data for the hull of the 12-meter "Valiant". theoretical 1 basis of the program can be found in Salveson, et a1 Gerritsma and Beukelman 7 . The 6 and in The program calculates the frequency dependent added mass and damping coefficients, and the Froude-Kriloff and sectional diffraction force coefficients using two parameter Lewis forms. The program can use these results to compute various responses such as motions in irregular waves and added resistance due to waves. The input and output are presented in Appendix 5. The operating conditions correspond to the example used throughout, except that it is not possible to specify a nonzero leeway angle to the program. Therefore the angle of incidence of the waves was set at = 180 - + X/2 = 1420 as a compromise between accurate modelling of the encounter frequency and the angle of incidence. -25- The program assumes the vessel has port-starboard symmetry, i.e. it neglects the effects of a mean heel angle. Gerritsma and Moeyes have The vessel and centers Experiments reported by 4 indicated that this may be acceptable4 geometry is specified by the sectional area coefficients of buoyancy. For motions not in the vertical plane there is also a multiple choice of sectional shapes. Viscous roll damping due to twin bilge keels can be calculated by a stripwise method. To model a yacht keel it is necessary to specify an equivalent pair of bilge keels. This was not done because pitch response was the primary focus of this investigation, and the program assumes pitch is uncoupled from roll. Results of the Seakeeping Program Displacement, The A: displacement is calculated tonnes divided by gravitational from the shape and appears in units of acceleration G22 = 1.04318 so that in yacht sized units A = 75,000 lb. This is high, but in the rightrangel3 Natural Frequency of Pitch, 5n: Since the added mass is frequency and speed dependent the natural -26- frequency in pitch was found by interpolation to be equal to the encounter frenquency, we, at which the following equation was satisfied e +A5n G55 Here C5 5 is the pitch restoring coefficient (tonne-ft/radian); Grr is the pitch moment of inertia 2 G 22 (RYY) G55= where RYY is the specified pitch gyradius; and A 5 5 is the added moment of inertia for pitch. m5n The result was 2.1 rad/sec. = This corresponds to a natural period of pitch for these conditions T - 2 2.9 sec. which is somewhat high for a 12-meter but also in the right range 3 . Since these results were fairly accurate it was assumed that the results for the hydrodynamic damping coefficients were also within the correct range. At the natural frequency the pitch damping coefficient was (by interpolation): B55 = 378 55 tonne-ft-sec -27- or, in yacht-sized units: H B5 5 = 847,000 lb-ft-sec The damping coefficient decreased moderately with frequency of encounter to about 255,000 at = 3.0, we = 5.97. The hydrodynamic damping ratio at the natural frequency was H = B5 5 2(G55 + = 0.24. 55)w5n VIII. REDUCED FREOUENCIES ...... _ ..... - i~~~~~~~~~~~~~~~~~~~~~~~~~~ A typical reduced frequency along the span is k(z) ¥(z) -_c(z) TVA x 15 2.9 x45 T VA A weighted average reduced frequency can be defined: Jz. c dz TV T V _ TA ~A 2 TAzdz .T k This is quite high. less. 841,500 = = : 65 + 1,796,320 z'8 -6386 VA z -A (9.1967 + 8.4753) j .4254 Therefore unsteady inviscid damping will be even than the quasi-steady result, (still assuming steady geometry). To see this intuitively, consider what happens while pitching forward. Angle of attack is reduced. Therefore circulation must be shed into flow parallel to span, leaving upwash behind as it goes. to increase the effective angle of attack temporarily. This tends The amplitude of attack oscillation is inversely proportional to the frequency. Consider now the aerodynamic terms in the analytic expression for the pitch damping coefficient, (14). By far the most significant factor here is the variation of lift coefficient with angle of attack. -29- (See also Appendix I )o This suggests that the damping coefficient will decrease at high frequencies, since as we have just seen the effective angle of attack changes less at high frequencies. Thus, since the pitch damping coefficient is most highly dependent on changing angle of attack, and since the angle of attack changes less at high frequencies, it may be concluded that the pitch damping coefficient decreases with frequency. -30- IX. THE EFFECT OF AERODYNAMIC PITCH DAMPING 'ON ADDED RESISTANCE'DUE TO PITCHING Given that the results of the hydrodynamic investigation and the results of the aerodynamic investigation are correct, then the effect of aerodynamic pitch damping on added resistance due to pitching can be calculated. For pitch alone 2 0 the transfer relation between pitch amplitude and wave amplitude is a5- recalling the results H BA 55 = 0.24 = 0.1 . H 55 A comparison can be made between the transfer relations with and without aerodynamic damping. 05 The largest difference occurs at resonance, W5n' where -5 a = .927 a aX -31- The pitch amplitude is proportional to the amplitude of the radiated waves, at least within the range of validity of any linear theory. But the added resistance due to pitch is proportional to the energy lost in the radiated waves, which is proportional to the square of the wave height. AF 1 f- Therefore aF 1 H a 0.86: aF1 H is the added resistance at resonance. Thus the added resistance calculated by the seakeeping program should be adjusted downwards by up to 14%. e -32- THE EFFECT OF PITCHING ON THE AVERAGE DRIVE FORCE X. In a linear analysis the average driving force, FR, will equal the steady state driving force. there may be a difference. But for nonvanishing pitch amplitudes To get a rough idea of the difference, the driving force was calculated (see Appendix output for the three conditions ~ = 0, +.1 -±0 )from the PSF program rad/sec. From the results _ ·. F R 0.1 830.3 0.0 1,000.1 -0.1 1,191.3 A FR -175.8 ---+185.2 it can be inferred that the average quasi-steady inviscid driving force was higher than the steady state value by a fraction of a percent. (The exact nonlinear quasi-steady inviscid average thrust requires integration of the instaneous thrust throughout a half period of oscillation.) -33- XI. OTHER MOTIONS:' ROLL ..Natural Frequency of Roll, W4n: From the output of the seakeeping program it should be possible to calculate the natural frequency for roll, 4n, defined as that frequency at which the following relation is satisfied : e 44' 44. G44 +A 44 : 4n Recall, however that the displacement calculated by the program was probably high, and that both the radius of gyration and the metacentric height were somewhat arbitrary inputs to the program. Therefore values were used which were consistent with the assumptions made in the chapter on numerical aerodynamics: C4 4 = 5000 (ft-lb)/degree = (Ryy)2 65,000 G5 slug-ft2 50,506 Then, (using the value of A 5 5 at the encounter frequency without interpolating), the natural frequency in roll is . .... .. '4n = 5000 l0.4619x 2240 + 50,506 = 1.97 rad/sec ]/2 me = 1.78 The corresponding natural period is .T4n 3.19 sec : Wn 4n which seems high, although less so than if C4 4 and G44 had been taken directly from the output. From this data the damping ratio, 54 for uncoupled rolling can be calculated: ........ *4 -(G4 2 .B . B44 + A 4) w4n 44 (ft-lb)/(rad/sec) 291,326 Roll Damping: Linearized Aerodynamic Here the approach is identical to that of the pitch damping derivation. For a chordwise strip of the sail the increment of rolling moment is dLA = z[dL cosB + dD sin.] z c dz 2 VA [CLCCSs + C sin3]. Taking the derivative with respect to the roll rate p, using the derivatives VAp = -zsin. VAp -35- and p VA and integrating over the span yields for the linearized quasi-steady invisicid aerodynamic roll dampingcoefficient BA 44 IdL AP - SA 2 'PAVA A2A X c z [2 2 2 CDsin2 C+ LB) cos 2 A 1 2 For the elliptically BA44 = 580,000 (CL+CD)sin2S] dz loaded example of (15), (17), (19), the value is (ft-lb)/(rad/sec) and the dampingratio is A = 1.99 which is very highly damped. Aerodynamic Roll Damping by Numerical Lifting Surface Methods Recall the results presented earlier: BA = 700,000 (ft-lb)/rad/sec) C -36- Then the aerodynamic roll damping ratio for the numerical sail model is 44 = 2.4 which is still well over damped. Hydrodynamic Roll Damping from the Seakeeping Program At an encounter frequency close to the natural frequency, the seakeeping program output is B4 = 1.796 tonnes/(rad/sec) = 4023 (ft-lb)/(rad/sec) The value changes only moderately with frequency. The corresponding damping ratio is H = 0.014 However observations indicate that hydrodynamic damping is much higher. As :aforementioned, better modeling of roll in the seakeeping program requires the specification of an equivalent pair of bilge keels. Recall also that leeway is neglected. To improve the results here, revision of the FORTRAN code may be necessary. Hydrodynamic Roll Damping by an Approximate Lifting Line Approach Here the same approach is used as previously for the aerodynamics of pitch and roll. The underbody is modeled as a lifting line rather than a slender body. -37- The differential cohtribution to the hydrodynamic rolling moment along the span is dLH = zC-dz LV (CLcosX + CDsinx) where CD includes all hydrodynamic drag. Differentiating with respect to the roll rate, p, using the derivative forms VBp zsinx and _ zcos p V and integrating over the span yields for the quasi-steady inviscid hydrodynamic roll damping coefficient H 1 44 ==2 P PH H V; B44 IciBc 2 2 nz" f sin DLx LD 2 z2[2CDsin2z + (CD+CL)COSx + (CL+CDxd dz Assuming elliptical loading, constant chord of 14 ft, and span of 9 ft, and neglecting all bracketed terms except CLA cos2x, a very rough estimate is BH4 44 92,000 The corresponding damping ratio is 4 = 0.3 'Summary of Results of Investigation into Aero-Hydrodynamics of Rolling Both the lifting line and lifting surface approaches indicate that roll is aerodynamically overdamped. improved analysis techniques. The hydrodynamic roll damping needs XII. OTHER MOTIONS: 'SURGE; SWAY, HEAVE; YAW No investigations were made of these motions, except that it was possible to calculate from the available data that for-sway B2 A = 300 lb/(ft/sec) and H B2 2 = 4,000 lb/(ft/sec) depending somewhat on operating conditions. Surge is not modeled by the seakeeping program. Heave could be modeled by the lifting surface program but was neglected as uninteresting. Presumably quasi-steady inviscid heave is similar to variable sweepback since in both cases the angle of attack is constant, but the angle of the streamlines to the midchordline changes. Yaw could not be modeled by the lifting surface program unless the sail was rotated 900 about its y-axis. was not essayed. Such geometrical magic -40- OTHER MOTIONS: PITCH COUPLING The seakeeping program does not indicate any pitch-roll coupling, but coupling arises due to the asymmetry of the aerodynamic surface. Recall the results from the numerical sail analysis: B54 = B52 = -350,000 (ft-lb)/(rad/sec) 7,000 (ft-lb)/(rad/sec) The pitch damping due to sway, B52, ought to be negligible except under conditions of extreme sidewise motion. damping due to roll is surprising. The (negative) pitch However its effect is likely to be small since, as it has been shown, roll is very heavily damped. -41- XIV. Observations CONCLUSIONS indicate that for a vessel sailing in waves, pitch is a large periodic motion which generates significant added resistance. This was confirmed by results of the M.I.T. 5-D Seakeeping Program. An investigation was undertaken of the extent to which the added resistance in waves could be attenuated by the aerodynamic damping of sails. Quasi-steady, inviscid lifting line and lifting surface models were used to solve the problem for a 12-meter yacht sailing to windward in a twenty knot breeze. For this problem it was found that aerodynamic pitch damping attenuated the added resistance by 14% when the waves were encountered at the natural pitching frequency. It was found that a 10% decrease in the viscous drag coefficient caused a 20% decrease in the aerodynamic pitch damping coefficient. The quasi-steady assumption was not particularly good. Unsteady effects probably diminish the significance of aerodynamic pitch damping. According to the linearized analysis, there are six contributions to an aerodynamic damping coefficient: to lift. three due to drag and three due For both drag and lift the three contributions are due to (1) Changing apparent wind speed, (2) Changing lift or drag coefficient, and (3) Changing apparent wind angle. The sign and magnitude of each contribution depends on the motions, sail geometry, and operating conditions. -42- For example aerodynamic damping of roll appeared to be very highly over-damped. Some motions were not investigated due to lack of interest or modeling difficulties. It was found that pitch motions could increase the average driving force by at least a fraction of a percent. The development of an aero-hydro-integrated performance prediction program for vessels sailing in waves could be developed. In the process, further investigation into coupling should consider the remaining motions Such as the aerodynamics of yaw and the hydrodynamics of rolling and sideslipping. Another exciting development which could be undertaken is the coding of a versatile program for analysis of sailing vessel aerodynamics using numerical lifting surface methods. -43- .REFERENCES 1. Milgram, Jerome H., "The Analytical Design of Yacht Sails", S.N.A.M.E. Trans., 1968. 2. Milgram, "Sail Force Coefficients for Systematic Rig Variations", S.N.A.M.E. T&R Report R-10. 3. Kerwin, Justin E., "A Velocity Prediction Program for Ocean Racing Yachts Revised to June, 1978," M.I.T. 4. Gerritsma, J., and Moeyes, G., "The Seakeeping Performance and Steering Properties of Sailing Yachts", H.I.S.W.A., 1973. 5. Warrick, Alexander, Jr., "Racing Yacht Performance in a Seaway", M.I.T. Master Thesis, O.E., 1976. 6. Newman, J. Nicholas, "Stability and Control in Quartering Seas", Symposium on Sailing Yacht Research, 7. M.I.T., November, 1966. Letcher, John S., Jr., "Steering Qualities off the Wind", A.I.A.A. Symposium "The Ancient Interface", 1971. 8. Greeley, David S., and Kerwin, Justin E., "Numerical Methods for Propeller Design and Analysis in Steady Flow", to be published. 9. 10. Newman, J. Nicholas, "Marine Hydrodynamics", M.I.T. Press, 1978. Greely, David S., "Introduction to Propeller Steady Flow Computer Programs", unpublished. 11. Marchaj, C.A., "Sailing Theory and Practice", Dodd, Mead, & Co., 1964. 12. Abbott, I.H., and Von Doenhoff, A.E., "Theory of Wing Sections", Dover, N.Y., 1959. -44- 13. Spens, P.G., DeSaix, P., and Brown, P. Ward, "Some Further Experi- mental Studies of the Sailing Yacht", Stevens Institute of Technology, Hoboken, N.J., 1967. 14. "Principles of Naval Architecture", Comstock, J.P., Editor, S.N.A.M.E., 1967. 15. User's Manual, M.I.T. 5-D Seakeeping Program, Design Laboratory, Department of Ocean Engineering, M.I.T. 16. Salveson, N., Tuck, E.O.,Faltinsen, O., "Ship Motions and Sea Loads", S.N.A.M.E. Trans., 17. Gerritsma, 1970. J3. and Buekelman, W., "Analysis in Waves of a Fast Cargo Ship", International of the Resistance Increase Shipbuilding Progress, Vol. 14, February, 1967. 18. Marchaj, C.A., "Aerohydrodynamics of Sailing", Dodd & Mead, N.Y. 1979. 19. Hedrick, J. Karl, Paynter, Henry M., "Nonlinear System Analysis and Synthesis: 20. Vol. 1 - Fundamental Principles", A.S.M.E., 1978. Thomson, William T., "Theory of Vibration and Applications", 1972. -45- - X3·F 3 X 1 F, : . X2 z, Z,w N,r Mq yl Y v VESSEL-FIXED COORDINATE SYSTEMS Figure 1 J, XP I -46- p2 WIND TRIANGLE. Figure 2 -47- rf' """ o 7 I X " _ _ _ _ _ _ ___ SAILPLAN FOR LIFTING LINE ANALYSIS Figure 3 -48- Figure 4 LIFTING SURFACE ANALYSIS: GEOMETRY WITH WAKE FOLLOW4ING FREESTREAM (a) Sail, Hub, and Flow -49- Ily ___ _ _ _ __I _ (b) Planform view __i -50L __ __ __ _1___ ______ ___ i II I I__ I _ _ I __ A It I y ~ ~ Y __ i ~ __ m _ lI i½ i'll .am I ___ ___I__ I V _ __ - - - zs- -- ii~ _ i i I -- \.1 --- \- -\ -- (c) I C--·~--LIII Front view · 11-*--- - --_ -- -51 - ) 00 t- LL -J ct, Li XZ 0 I- Li C-) ul LL -I LLJ 0-0 -52- k,~~~~~Z N--t1 ··~~~~~~~~ (e) Pitching forward -53- (f) Pitching aft -54- (g) Rolling -55- (h) Swaying -56- APPENDIX ROUGH CALCULATION OF AERODYNAMIC PITCH DAMPING (14) Recall Equation BA P2VAjcz2[2CCDcos2 + (CD + CL)sin - (CL + CD) sin2¢]dz S Assume bracketed portion is spanwise constant (as for an elliptical load distribution)9 Recall (15), (17), (19): 0.7 CL CL_ 211 A 4C CD= .1167 C D A-+2 45 VA p = 0.00234 8 = 25 From Figure 3: s2 A S jib 602 - Amai n = 5.39 2 = 3.53 => 60 34 => jib A A- + = i 0. 7294 main Hence jib CL main 4.0087 4.5838 .5063 .3789 _1 CD B = 0.638 A+2 -57- then main jib 2 C COS2 5 = .1906 .1906 (CD + CL )Sin2B = .7367 .8394 = -(-CL +CDS) sin2~ -.4620 -.4132 .4653 .6168 and the moments of area are 34(65 z3 cz2 dz jCZ dz= 4 65 = 841,500 *0 5 jib I cz2 dz= 27 (86 main main z3 80 = 1,796,320 then BA 55 = 78,950 z4486 836 7)6 2~(402 4+ 40 2 [ - 462) 3 3 92 z 4 +4 5 5 86 1 6 -58- APPENDIX2 ·EXPLANATION OF PROGRAM CYCLONE This program takes a sail and whips it into a propeller. This program reads a datafile (with filetype DATA), containing generalized coordinates for a sail's geometry and operating conditions. Finally, it Then it transforms this DATA into propeller coordinates. writes the converted geometry into two files (filetypes INPGEO and ADIINt!) for analysis using the PSF2 package of lifting surface programs. For the most part the program is easily understood but note the following: * Geometry can be specified at spanwise stations. Since splines will be fit to the specified geometry, it must be smooth! - Alternatively, geometry can be specified by polynomial functions using the dummy variable "crew" which increases with height from its midspan origin. * The propeller must rotate(?). An RPM of 1 or less is recommended for ease of output interpretation and formating. : Heel cannot be accomodated at this time. · Bend is defined in the projection of the sail on the x-z plane as the displacement of the leading edge from vertical. The bend at the tack is zero. · Sag is defined in the projection of the sail on the x-y plane as the y-displacement of the leading edge from vertical. at the tack is zero. The sag -59- · Twist is defined as the angle between the chordline and the x-z plane · Chordwise thickness and camber distributions must be specified by editing an existing INPGEO file. * Use a large ratio of propeller diameter to sailspan! * x skew and x-rake are currently set to zero. · Due to an uncorrected error at this time, specifying positive sway velocity yields results for negative velocity. * z prime is a spanwise coordinate which increases with height from its origin at the foot. * Sailing vessel coordinates are = -x of propeller x positive ahead y positive to port = z of propeller 2 positive up = y of propeller Origin is at center of waterplane area. Vessel sails directly upstream on starboard tack, "semisubmerged" with sailfoot at hub surface. UF- -60, . 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U) 0J 0- 0 U) Ix I'-OI--Z >LLJ L 3Z h+ '- 00000 0000000 0 - U (0 MIm 0 UO C).)I 00 C x LU LU Li LU Ly I- 0_ 0,--Z -CYU CLO U) APPENDIX 3 the forces and momentsacting on the sail From the output of PSF2FOR are as follows: Heeling Moment: L = TORQUE - KFZ 600 d) (RHUB - 688,072,320 KFZ TORQUE - Lift Coefficient: [KFZ - KFX tan (-X)] CL = 1 2 = V PS VA A pn 2 D4 cos(-A) 3600 222(KFZ - 0.4663 KFX) Drag Coefficient: CD = 222(0.4663 KFZ + KFX) Pitch Moment: n2 5 3600 = KMZ - THRUST(RHUB - 5) 1,617,410 KMZ - 515 THRUST Sway Force: = pn2 D5 3600 KFZ -64- Driving Force: FR = THRUST cos + p n2D4 KFZ cos (90-x) 3600 = 0.9976 THRUST + 9,4020.5 KFZ -65- APPENDIX 4 PSF2 OUTPUT CONTENTS: PAGE Geometry Analysis: 66 Steady State DATA File for X 5 ±= 0.1 66 69 Analysis: Pitching Forward 70 Analysis: Pitching Aft 73 with 10% Change in Viscous Drag 76 DATA File for Roll and Sway 77 ADMIN File for Roll and Sway 78 Analysis: 79 Roll with 10% Change in Viscous Drag Analysis: Sway 82 83 ii 1 i N ; I N'. . . ... 4. 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BUZZARDS TOWER SPECTRUM, 20 KTS NSTA NROMS NENC 22 9 2 NVL NMOT 2 0 NSP 0 NSEA NS IO NADR NEVT 2 NWX NSOMS 1 1 12 1 BEAM 11.2700 DRAFT 9.5800 RYY 15.2000 RXX 5.0000 RZZ 15.2000 XZI 0.0 UNIT ORIGIN ZETAA 0.0 1.0000 XI(I) 25.9600 23.6000 21.2400 18.8800 16.5200 14.1600 11.8000 9.4400 7.0800 4.7200 2.3600 0.0 -2.3600 -4.7200 -7.0800 -9.4400 -11.8000 -14.1600 -16.5200 -18.8800 -21.2400 -23.6000 STATION I 1 2 3 4 5 6 7 IWBK(I) 4 1 i 1 1 1 1 1 1 1 1 3 3 3 3 3 3 3 3 3 3 YM(I) 1.8700 3.5600 4.8900 6.0800 7.2000 8.2600 9.1500 9.8500 10.4300 10.8700 1i.1000 11.2700 11.2000 11.0500 10.7000 10.2400 9.5900 8.7500 7.7000 6.1800 3.7800 0.1500 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 . 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 NFQ 0 NFR 0 GRAV 32.1740 XCG 0.1290 VCG -1.0000 GM 3.0000 RHO XRHO NU 0.0008890 1.9898996 0.0000128 WSURFA 1000.00 ALFA 0.0 ZM(I) SIGMA(I) 0.4300 0.6467 1.0800 0.6814 1.7000 0.6881 2.3200 0.6948 2.9700 0.6902 3.6400 0.6732 4.4200 0.6350 5.2500 0.5952 6.1500 0.5509 7.0500 0.5110 7.8500 0.4797 8.5300 0.4485 9.0500 0.4227 9.4000 0.3924 9.5800 0.3610 4.9000 0.6314 4.6000 0.5885 4.2500 0.5566 3.8300 0.5290 3.4100 0.4669 2.9600 0.2824 2.8000 0.5238 BKRAD(I) BILRAD(I) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 NPCH 1 0 XLBP 49.5600 STATION I 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 20 21 22 12 13 14 15 16 17 18 19 20 21 NSPC 2 MP NTURB HASBK N NBEND NWT 6 1 0 0 0 0 CB 0.2193 0 8 9 10 11 20 NP 10 BKGIR(I) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZCB(I) 0.1400 0.3600 0.5670 0.7700 0.9900 1.2000 1.5000 1.7500 2.0500 2.3000 2.6000 2.8000 3.0000 3.1000 3.2000 1.6000 1.5000 1.4000 1.3000 1.1000 0.1000 0.9000 GIRTH(I) 2.0000 4.1600 5.9500 7.6500 9.3000 11.0000 12.7000 14.4000 16.0000 17.8000 19.2000 20.4000 21.2000 21.8000 22.0000 14.1700 13.3000 12.2000 10.9000 9.2000 7.0000 5.6000 RIFLR(I) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ALPH(I) 0.0 0.0 0.0 0.0 0.0 0.0 0.0' 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BKWID(I) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PHI(I) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 PSI(I) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 LIWO(I) 0.0 0.0 0.0 0.0 0.0' 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 -88- 0 ocn 0a) oo O0 r(o 00T 00 - D rn um 00 00 00 ~NN0N -0 000 00 o0 8; 0 0 o w>- 00 00 o0 0N 00 ) LfO o gog OO oro0 00 00 0 8 In co 0 - 0r- . 0 00 0 000 000 000 o0 000 00N 0 0 oo 000 l000 (0 000 O0 000 (N00 00t -0- 00 cono o 00 0 0 C o 000to 0 0 In 00 000 0 (co 0 0O) lc0)oo w(ND 0 0-c4 0-0 P z 0 v x w 0 w o Im0 3: z = 3 z 0 0 c 0 ,, m oa. 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CD CD 0Z J0 0 Ln LO - 8 8 00 O O O O I0 I I O O 000 c O a !l I t' - 0 0 0 Ua Cl 0c' c t 0iIcr 000a U4 - N a LZ' t 00 0 CY 000 zi 00) I i iO IN ') CD C, ct) cO a 000 i( lu nOOL v a , a aU o- * a 000 Li C, o t/)00 - (D wO 1 OO z I *· tJ O O 0O 00 z0 a a a I u I0 0 0 0 zZ N N -. L- - I CD a. 00 00 00 a4 000 o z 0 w o a 5- 0 i-0 2.- ii *i .i .i IN N 0ZN0 Oj 0ZN0w 0, O -.. J a.J U. 0Z0 OZ0 Z Z Li Z L ZZ O OO Z ZZ z zz 0 00 3 c~~~~m~~~t~ a 0 c . _ a 0 0 0 . r-Q)(V~~~~~~ J L tn -IC c J 0f1o ztLn/) Lu a~~~~~~~~~~~ U. Z 3 - :. U. a: LL. > 3 rC-) Lu mE -3 a CD a .u 0 0.4 I a Z 3 a O z :E .- za4- 0 0 00 - -J Cn Lu t a - U, C- JO Lu a: co CD _ It a 0 co 0 0 I 43 00 a II0- 0 0 -J N O N 4J a-- Z a 0 00 rr C) CD Q 0 -91 - YAW FR-KRL -0.0008 -0.0011 -0.0000 -0.0000 WVDIFF -0.0561 -0.0719 -0.0003 -0.0004 TOTALS -0.0570 -0.0729 -0.0003 -0.0004 SUM OF ALL THE MODES AND THE DIFFRACTION POTENTIAL CONTRIBUTION ALL MODES FR-KRL 0.0825 ALL MODES WVDIFF -3.5919 - - - - - -- - -- - TOTALS DIFFR. POT. CONT. TOTALS ETA .0 -.726099E-04 G .0 .0 .0 .0 .0 .0 A .0 .0 .0 B -4.5974 - -- - - - -- - -- -0.0214 -0.0274 3.5244 4.5110 0.0215 0.0275 0.0150 0.0192 0.0001 0.0001 .462231E-01 .281453E-03 .0 .0 .0 .0 1.04318 .0 1.04318 .0 -0.0280 ____ _ ___- -4.4918 .271906E-02 .0 -0.0219 - --- -- --- -- 0.0006 -3.5094 .0 1.04318 0.0005 .0 .502922 -.632044E-02 1.04318 26.0796 1.00056 -.153121E-02 .0 .0 -.134571 .0 -.231467E-02 .148432E-02 .0 .134571 .0 .0 .0 .0 .0 241.017 .134571 .0 241.017 .0 .0 .0 .0 .0 2.03162 .0* 61.5843 .0 -3.83959 1.90662 .0 -.134571 2.50124 .0 .0 .0 .0 .0 .0 8.21540 .0 4.93073 .0 904.412 .0 .0 .0 .0 .0 .0 .0 19.3936 .0 19.8929 .0 160.257 .0 .0 .0 .0 .0 C 0.1056 .0 .0 .0 .0 .0 .0 2.03162 .0 .287614 .0 .334265 .0 -32.0944 .0 .0 .0 .0 .0 .0 .0 -61.9855 1.57528 .0 33.7092 .0 11.0589 .0 .334265 .0 .249234 .0 -34.9717 .0 .0 .0 .0 11.6684 .0 .0 -6.78122 .0 100.690 .0 .0 .0 1618.05 .0 -33.8302 .0 1008.24 .0 .0 .0 -6.78122 .0 1660.82 .0 -8.87453 .0 .0 .0 .0 .0 .0 .0 -92- 0 00 00 On oo 0l On Oo n 00 00 oo ro h rSn n nro - >& on 0-0-on 00 _I) W W on c0 n w@w W ao Pn --On On n -n oo no norn 00 o on 00 oo w 00 no org --on 00 oo no 00. 00 00 00 0g on o n- O- r t)w1 00 00 o-· ww - O Oa 0 nO rn -. n 00 . 0n 0 oO WD 040 o qo 00 03r uw .o -0.0 on. o. 00 -no . 00 @ .n 0000 00 O 101 n 00 00 00O0 r 0 wr .n 0.0. 0 on w n - - 10 l- r " ~~~~~~~~ *u oO l 0 .. v w 00 On 0o O -o O ) r 0 , -n cw "0.0 0)0@ cc @n 00c v - 0.0 n0. w >n Qo O- Pa .w .0.0 n0 *u ww C- - o ~O . oo 0.-00.0 o sO O00 w w 000 . 00. w Oc 4 o 00 0 Pn O ,E3 0 r _- 000 nh 00 sW0 . 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