Navigation 1
USCG Speed by RPM Problems
1. The propeller on a vessel has a diameter of 23.7 feet and a pitch of 24.8 feet. What
would be the apparent slip if the vessel cruised 442 miles in a 23 hour day (observed
distance) at an average RPM of 89?
a. -7.60%
b. 7.60%
c. -11.80%
d. 11.80%
2. The propeller on a vessel has a diameter of 20.6 feet and a pitch of 23.4 feet. What
would be the apparent slip if the vessel cruised 538 miles in a 24 hour day (observed
distance) at an average RPM of 87?
a. -11.60%
b. 11.60%
c. -10.30%
d. 10.30%
3. The propeller on a vessel has a diameter of 21.2 feet and a pitch of 20.0 feet. What
would be the apparent slip if the vessel cruised 391 miles in a 24 hour day (observed
distance) at an average RPM of 88?
a. -11.50%
b. 11.50%
c. -6.20%
d. 6.20%
4. The propeller on a vessel has a diameter of 19.9 feet and a pitch of 21.6 feet. What
would be the apparent slip if the vessel cruised 395 miles in a 23 hour day (observed
distance) at an average RPM of 78?
a. -3.20%
b. 3.20%
c. -12.00%
d. 12.00%
5. The propeller on a vessel has a diameter of 22.8 feet and a pitch of 19.3 feet. What
would be the apparent slip if the vessel cruised 287 miles in a 24 hour day (observed
distance) at an average RPM of 67?
a. -6.30%
b. 6.30%
c. -24.00%
d. 24.00%
6. The propeller on a vessel has a diameter of 24.6 feet and a pitch of 26.1 feet. What
would be the apparent slip if the vessel cruised 462 miles in a 24 hour day (observed
distance) at an average RPM of 72?
a. -2.70%
b. 2.70%
c. -3.80%
d. 3.80%
7. The propeller on a vessel has a diameter of 18.8 feet and a pitch of 21.4 feet. What
would be the slip if the vessel cruised 378 miles in a 24 hour day (observed distance) at
an average RPM of 76?
a. 1.90%
b. -1.90%
c. 4.70%
d. -4.70%
8. The propeller on a vessel has a diameter of 25.3 feet and a pitch of 23.2 feet. What
would be the apparent slip if the vessel cruised 515 miles in a 23 hour day (observed
distance) at an average RPM of 93?
a. -3.60%
b. 3.60%
c. -5.20%
d. 5.20%
9. The propeller on a vessel has a diameter of 20.9 feet and a pitch of 19.6 feet. What
would be the apparent slip if the vessel cruised 447 miles in a 23 hour day (observed
distance) at an average RPM of 108?
a. -5.60%
b. 5.60%
c. -7.00%
d. 7.00%
10. The propeller on a vessel has a diameter of 21.5 feet and a pitch of 24.5 feet. What
would be the apparent slip if the vessel cruised 458 miles in a 23 hour day (observed
distance) at an average RPM of 78?
a. 5.60%
b. -5.60%
c. 12.30%
d. -12.30%
11. The propeller on a vessel has a diameter of 24.0 feet and a pitch of 21.3 feet. What
would be the slip if the vessel cruised 510 miles in a 24 hour day (observed distance) at
an average RPM of 86?
a. -12.20%
b. 12.20%
c. -17.50%
d. 17.50%
12. The propeller on a vessel has a diameter of 20.2 feet and a pitch of 19.0 feet. What
would be the apparent slip if the vessel cruised 367 miles in a 24 hour day (observed
distance) at an average RPM of 84?
a. 2.90%
b. -2.90%
c. 5.20%
d. -5.20%
13. The propeller on your vessel has a pitch of 22.8 feet. From 0800, 18 April, to 1020, 19
April, you steamed an observed distance of 403.6 miles. If your average RPM was 74,
what was the slip?
a. 7.00%
b. -7.00%
c. 8.00%
d. -8.00%
14. The observed distance for a day's run was 302.7 miles. The propeller had a pitch of
20'06", and the average RPM was 67. What was the slip?
a. 0.70%
b. -0.70%
c. 7.00%
d. -7.00%
15. The propeller of a vessel has a pitch of 19.0 feet. If the vessel traveled 183.5 miles
(observed distance) in 24 hours at an average of 44 RPM, what was the slip?
a. 7.40%
b. -7.40%
c. 11.60%
d. -11.60%
16. The propeller on your vessel has a pitch of 18'09". If the observed distance for a day's
run was 399.4 miles and the average RPM was 86, which statement is TRUE?
a. The slip is a positive 5%.
b. The day's run by engine RPM was 404.5 miles.
c. The slip is a negative 5%.
d. The day's run by engine RPM was 390.6 miles.
17. The observed noon to noon run for a 24 hour period is 489 miles. The average RPM for
the day was 95. The pitch of the wheel is 22.5 feet. What is the slip of the wheel?
a. 3.20%
b. 3.40%
c. 3.70%
d. 3.90%
18. From 1020, 3 March, to 1845, 5 March, your vessel steamed an observed distance of
845.6 miles. The average RPM was 78 and the pitch of the propeller was 20'03". What
was the slip?
a. -4%
b. 4%
c. -8%
d. 8%
19. Your vessel's propeller has a pitch of 22'06". From 0530, 19 March, to 1930, 20 March,
the average RPM was 82. The distance run by observation was 721.5 miles. What was
the slip?
a. 4%
b. -4%
c. 7%
d. -7%
20. If the speed necessary for reaching port at a designated time is 18.5 knots and the pitch of
the propeller is 21.7 feet, how many revolutions per minute will the shaft have to turn,
assuming a 4% negative slip?
a. 83
b. 90
c. 97
d. 114
21. If the speed necessary for reaching port at a designated time is 19.6 knots and the pitch of
the propeller is 24.6 feet, how many revolutions per minute will the shaft have to turn,
assuming a 5% positive slip?
a. 76
b. 85
c. 97
d. 106
22. If the speed necessary for reaching port at a designated time is 20.7 knots and the pitch of
the propeller is 23.8 feet, how many revolutions per minute will the shaft have to turn,
assuming a 3% negative slip?
a. 74
b. 79
c. 86
d. 98
23. If the speed necessary for reaching port at a designated time is 17.4 knots and the pitch of
the propeller is 25.6 feet, how many revolutions per minute will the shaft have to turn,
assuming a 3% positive slip?
a. 63
b. 67
c. 71
d. 75
24. If the speed necessary for reaching port at a designated time is 16.8 knots and the pitch of
the propeller is 22.3 feet, how many revolutions per minute will the shaft have to turn,
assuming a 4% negative slip?
a. 61
b. 66
c. 73
d. 80
25. If the speed necessary for reaching port at a designated time is 19.2 knots and the pitch of
the propeller is 22.7 feet, how many revolutions per minute will the shaft have to turn,
assuming a 4% positive slip?
a. 82
b. 89
c. 96
d. 103
26. If the speed necessary for reaching port at a designated time is 15.7 knots and the pitch of
the propeller is 23.4 feet, how many revolutions per minute will the shaft have to turn,
assuming a 6% negative slip?
a. 64
b. 68
c. 72
d. 76
27. If the speed necessary for reaching port at a designated time is 16.4 knots and the pitch of
the propeller is 23.8 feet, how many revolutions per minute will the shaft have to turn,
assuming a 6% positive slip?
a. 66
b. 74
c. 82
d. 90
28. If the speed necessary for reaching port at a designated time is 23.7 knots and the pitch of
the propeller is 20.8 feet, how many revolutions per minute will the shaft have to turn,
assuming a 7% negative slip?
a. 108
b. 112
c. 116
d. 124
29. If the speed necessary for reaching port at a designated time is 17.8 knots and the pitch of
the propeller is 24.7 feet, how many revolutions per minute will the shaft have to turn,
assuming a 7% positive slip?
a. 67
b. 71
c. 75
d. 79
30. If the speed necessary for reaching port at a designated time is 18.2 knots and the pitch of
the propeller is 23.9 feet, how many revolutions per minute will the shaft have to turn,
assuming a 2% negative slip?
a. 70
b. 73
c. 76
d. 79
31. If the speed necessary for reaching port at a designated time is 21.6 knots and the pitch of
the propeller is 22.5 feet, how many revolutions per minute will the shaft have to turn,
assuming a 2% positive slip?
a. 81
b. 87
c. 95
d. 99
32. If the speed necessary for reaching port at a designated time is 12.6 knots and the pitch of
the propeller is 13.6 feet, how many revolutions per minute will the shaft have to turn,
assuming no slip?
a. 81
b. 85
c. 90
d. 94
33. The speed of advance necessary to arrive in port at a designated time is 15.8 knots. The
pitch of the propeller is 20.75 feet. You estimate 5% positive slip. How many RPM
must you turn to make the necessary speed?
a. 73.5
b. 76.2
c. 79.9
d. 81.2
34. The speed necessary to reach port at a designated time is 18.7 knots. The propeller pitch
is 24'03", and you estimate 3% positive slip. How many RPM's will the shaft have to
turn?
a. 81 RPM
b. 87 RPM
c. 98 RPM
d. 104 RPM
35. If the speed necessary for reaching port at a designated time is 18.6 knots, and the pitch
of the propeller is 26.2 feet, how many revolutions per minute will the shaft have to turn,
assuming a 4% negative slip?
a. 69
b. 72
c. 75
d. 78
36. You must average 16.25 knots to reach port at a designated time. Your propeller has a
pitch of 21'08", and you estimate 4% negative slip. How many RPM's must you average
to arrive on time?
a. 73 RPM
b. 77 RPM
c. 82 RPM
d. 88 RPM
37. If the pitch of the propeller is 19.7 feet, and the revolutions per day are 86,178, calculate
the days run allowing 3% negative slip.
a. 279.2 miles
b. 287.6 miles
c. 311.4 miles
d. 326.2 miles
38. If the pitch of the propeller is 20.6 feet, and the revolutions per day are 107,341, calculate
the days run allowing 3% positive slip.
a. 352.7 miles
b. 363.6 miles
c. 374.5 miles
d. 389.1 miles
39. If the pitch of the propeller is 21.5 feet, and the revolutions per day are 96,666, calculate
the days run allowing 9% negative slip.
a. 311.1 miles
b. 341.8 miles
c. 357.9 miles
d. 372.6 miles
40. If the pitch of the propeller is 22.4 feet, and the revolutions per day are 103,690, calculate
the days run allowing 9% positive slip.
a. 321.7 miles
b. 347.6 miles
c. 382.0 miles
d. 416.4 miles
41. If the pitch of the propeller is 26.3 feet, and the revolutions per day are 87,421, calculate
the days run allowing 7% negative slip.
a. 351.7 miles
b. 378.1 miles
c. 404.6 miles
d. 419.3 miles
42. If the pitch of the propeller is 25.1 feet, and the revolutions per day are 91,591, calculate
the days run allowing 7% positive slip.
a. 351.6 miles
b. 378.1 miles
c. 390.0 miles
d. 404.6 miles
43. If the pitch of the propeller is 24.8 feet, and the revolutions per day are 93,373, calculate
the days run allowing 11% positive slip.
a. 307.3 miles
b. 339.0 miles
c. 380.9 miles
d. 422.8 miles
44. If the pitch of the propeller is 23.2 feet, and the revolutions per day are 94,910, calculate
the days run allowing 11% negative slip.
a. 322.3 miles
b. 362.3 miles
c. 382.0 miles
d. 402.0 miles
45. If the pitch of the propeller is 26.7 feet, and the revolutions per day are 131,717, calculate
the days run allowing 4% negative slip.
a. 555.2 miles
b. 578.4 miles
c. 601.6 miles
d. 649.4 miles
46. If the pitch of the propeller is 21.3 feet, and the revolutions per day are 126,214, calculate
the days run allowing 4% positive slip.
a. 424.5 miles
b. 442.1 miles
c. 459.9 miles
d. 477.3 miles
47. If the pitch of the propeller is 20.1 feet, and the revolutions per day are 118,178, calculate
the days run allowing 6% negative slip.
a. 367.2 miles
b. 381.6 miles
c. 398.4 miles
d. 414.1 miles
48. If the pitch of the propeller is 19.4 feet, and the revolutions per day are 96,713, calculate
the days run allowing 6% positive slip.
a. 266.4 miles
b. 290.1 miles
c. 308.6 miles
d. 327.1 miles
49. If the pitch of the propeller is 21.2 feet, and the revolutions per day are 93,660, calculate
the days run allowing 5% positive slip.
a. 163.3 miles
b. 217.8 miles
c. 310.3 miles
d. 342.9 miles
50. The propellers on your twin screw vessel have a pitch of 16'04". What is the distance in a
day's run if the average RPM is 94, and you estimate 7% positive slip?
a. 338.3 miles
b. 389.3 miles
c. 676.6 miles
d. 778.6 miles
51. The pitch of the propeller on your vessel is 19'09". You estimate the slip at -3%. If you
averaged 82 RPM for the day's run, how many miles did you steam?
a. 370.8
b. 373.6
c. 393.7
d. 395.3
52. You are turning 100 RPM, with a propeller pitch of 25 feet, and an estimated slip of -5%.
What is the speed of advance?
a. 24.7 knots
b. 23.5 knots
c. 25.9 knots
d. 22.3 knots
53. You are turning 88 RPM, with a propeller pitch of 19 feet, and an estimated slip of 0%.
What is the speed of advance?
a. 16.5 knots
b. 16.9 knots
c. 17.3 knots
d. 18.1 knots
54. You are turning 93 RPM, with a propeller pitch of 25 feet, and an estimated slip of 0%.
What is the speed of advance?
a. 20.2 knots
b. 21.9 knots
c. 22.4 knots
d. 22.9 knots
55. You are turning 84 RPM, with a propeller pitch of 22 feet, and an estimated slip of 0%.
What is the speed of advance?
a. 16.8 knots
b. 17.7 knots
c. 18.0 knots
d. 18.2 knots
56. You are turning 82 RPM, with a propeller pitch of 23 feet, and an estimated slip of +6%.
What is the speed of advance?
a. 17.5 knots
b. 17.9 knots
c. 18.4 knots
d. 19.7 knots
57. You are turning 85 RPM, with a propeller pitch of 19 feet, and an estimated slip of +3%.
What is the speed of advance?
a. 14.7 knots
b. 15.5 knots
c. 16.4 knots
d. 17.1 knots
58. You are turning 68 RPM, with a propeller pitch of 18 feet, and an estimated slip of +2%.
What is the speed of advance?
a. 10.7 knots
b. 11.5 knots
c. 11.8 knots
d. 12.3 knots
59. You are turning 105 RPM, with a propeller pitch of 17 feet, and an estimated slip of -1%.
What is the speed of advance?
a. 15.3 knots
b. 16.9 knots
c. 17.4 knots
d. 17.8 knots
60. You are turning 90 RPM, with a propeller pitch of 24 feet, and an estimated slip of -3%.
What is the speed of advance?
a. 18.8 knots
b. 19.2 knots
c. 20.6 knots
d. 21.9 knots
61. You are turning 78 RPM, with a propeller pitch of 21 feet, and an estimated slip of -7%.
What is the speed of advance?
a. 14.9 knots
b. 15.7 knots
c. 17.3 knots
d. 17.8 knots
62. You are turning 100 RPM, with propeller pitch of 25 feet, and an estimated negative slip
of 5%. What is the speed of advance?
a. 23.4 knots
b. 24.7 knots
c. 25.9 knots
d. 26.3 knots
Answers
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
D
A
D
A
B
C
A
C
D
B
C
A
C
C
A
C
B
B
B
A
B
C
C
C
B
A
B
A
D
C
D
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
D
D
A
A
A
B
A
D
B
C
A
B
D
C
A
D
B
C
A
D
C
A
D
D
A
B
C
D
D
C
C