Rocket Flight Analysis
Team Members:________________________________
Rocket when ejection charge is seen.(white puff of smoke)
Measure
flight time
and angle
Launch site
baseline
You need ONE Successful launch. Two are written here in case the first launch is unsuccessful.
2nd Launch
1st Launch
Variables
Engine type used
Avg Thrust Force of engine(N)
Mass of rocket before launch
(include engine and wadding)(kg)
Mass of propellant kg
Average mass during thrust stage kg
Thrust time (s)
Calculated Maximum height (m)
Cross sectional diameter of rocket (mm)
Parachute diameter (mm)
Data taken during 1st Launch
Time to maximum height (s)
Total flight time (s)
Baseline (m)
Timer 1
Timer 2
Timer 3
Avg Time
Angle student 1 Angle student 2 Angle student 3 Avg Angle measured
Angle at maximum
height/ejection charge (degrees)
Data taken during 2nd Launch
Time to maximum height (s)
Total flight time (s)
Baseline (m)
Timer 1
Timer 2
Timer 3
Avg Time
Angle student 1 Angle student 2 Angle student 3 Avg Angle measured
Angle at maximum
height/ejection charge (degrees)
Calculate acceleration of rocket during thrust stage
Free body diagram
F=F(net)=ma
Final Thrust velocity
Fthrust -Wavg=mavga
Vf =vi + at
a= Fthrust -Wavg/mav
(t= thrust time)
Thrust Force (N)
Net Force
F(net)=ma
Thrust displacement
d=1/2at2
(t= thrust time)
Weight (N)
Thrusting stage calculations table
Launch trial
Thrust time(s)
Acceleration(m/s/s)
Final Thrust
Velocity (m/s)
Displacement
during
thrust
stage (m)
1st
2nd
Show work here for calculating acceleration, final thrust velocity and displacement during thrust stage
Coasting stage calculations table
Assume final thrust velocity = initial coasting velocity
d= 1/2gt2 + vit (g= -10m/s/s)
Launch trial
Time
maximum
height (s)
to Coasting
(s)
time Initial coasting Displacement to
velocity (m/s)
ejection charge
during coasting
stage (m)
Total
displacement to
ejection charge
height (m)
Show work here for calculating Coasting time, Displacement to ejection charge during coasting stage, and total
displacement to ejection charge
Data calculated from "Model Rocket Altitude Predictor" internet site.
BE SURE TO PRINT OUT ROCKET FLIGHT GRAPH WITH DATA!!!
http://webalt.markworld.com/webalt.html
Launch trial Height to ejection Peak
speed Total flight
charge(m) (use time (m/s)(same as final time (s)
from above table)
thrust velocity)
Determine (show in box)percent error for ejection charge height between your calculated
values, Internet site, and actual data (use your internet site data as the true value)
Your calculated value ignores air resistance. The Internet site includes air resistance.
Your calculated values. Internet site
Actual measured value vs. Internet site
Calculated and internet values should not be very close.
Internet and actual measured should be closer to each other in comparison to calculated and internet values.
Wow you really shouldn’t ignore air resistance!!
More PHUN PHUN PHUN
Links to Model Rocket formula and descriptions
http://www.rocketmime.com/
http://my.execpc.com/~culp/rockets/rckt_sim.html
http://www.rocketmime.com/rockets/rckt_eqn.html