AFOQT Practice Test

What is the formula for calculating Thrust Horsepower (THP)?

1. thp = (thrust x aircraft speed) / 550

2. thp = (thrust x aircraft speed) / 375

3. thp = (thrust x aircraft speed) / 250

4. thp = thrust x (aircraft speed x 2)

The correct answer is: thp = (thrust x aircraft speed) / 375

The formula for calculating Thrust Horsepower (THP) is derived from the relationship between thrust, speed, and horsepower. When calculating THP, the thrust produced by an aircraft and its speed through the air are utilized. The proper formula indicates that Thrust Horsepower is equal to the thrust in pounds multiplied by the speed in miles per hour, divided by a constant factor to convert the result into horsepower. The specific constant used in this context is 550, which is derived from the definition of horsepower as the ability to perform work over time. For this calculation, it is crucial to use the correct conversion factors. The result of dividing thrust times speed by 550 gives you the equivalent power output in units that are understood in aviation contexts. This ties into the fundamentals of aerodynamics and performance metrics in aviation. Therefore, the correct formula applies the standard conversion factor alongside the thrust and speed components to yield an accurate measure of thrust horsepower.