QUESTION 2
Choose the best description of the difference between Shaft Horsepower (SHP) and Thrust Horsepower (THP).

A. SHP is a power rating with accessories, and THP is a power rating that also includes the propeller.
B. SHP is a power rating for helicopters, and THP is a power rating for reciprocating powered airplanes.
C. On aircraft, they are essentially the same: SHP is listed in horsepower (kW in Europe), and THP is listed in foot-pounds (ft-lb) of torque.
D. None of the above accurately describe horsepower.

Question

Skye1348 Skye1348

24-07-2024
Engineering

Answered

QUESTION 2
Choose the best description of the difference between Shaft Horsepower (SHP) and Thrust Horsepower (THP).

A. SHP is a power rating with accessories, and THP is a power rating that also includes the propeller.
B. SHP is a power rating for helicopters, and THP is a power rating for reciprocating powered airplanes.
C. On aircraft, they are essentially the same: SHP is listed in horsepower (kW in Europe), and THP is listed in foot-pounds (ft-lb) of torque.
D. None of the above accurately describe horsepower.

Answer :

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GinnyAnswer GinnyAnswer · Answer 1 · 2024-07-24T13:18:28-04:00

Answer: D. none of the above accurately describe horsepower.

Step-by-step solution:

1. Understanding Shaft Horsepower (SHP):
- Shaft Horsepower (SHP) refers to the power output of an engine measured at the engine’s output shaft.
- This measurement of power is taken before any losses so it represents the power that is available to drive systems such as propellers, pumps, generators, etc.

2. Understanding Thrust Horsepower (THP):
- Thrust Horsepower (THP) is a measure of the actual thrust produced by an aircraft engine and propeller combination.
- It takes into account the propeller efficiency and represents how effectively the engine’s power is converted into thrust to propel the aircraft.

3. Analyzing the Given Choices:
- Option A: This option suggests SHP is a power rating with accessories and THP includes the propeller. This is not accurate as it does not distinguish the correct nature of SHP and THP.
- Option B: This option incorrectly states SHP is for helicopters and THP for reciprocating powered airplanes. SHP is not exclusive to helicopters, nor is THP for reciprocating engines only.
- Option C: This option claims SHP and THP are essentially the same on aircraft, which is incorrect. They represent different measures of power and are not the same.
- Option D: This suggests that none of the descriptions accurately describe horsepower, which after analyzing the given options, is correct.

So, after evaluating all the provided choices, we determine that none accurately describe SHP or THP, which leads us to conclude that the correct answer is D. none of the above accurately describe horsepower.