What does "Full Throttle Height" refer to?

"Full Throttle Height" refers to the maximum height at which a specified boost can be maintained at a specified revolutions per minute (R.P.M.) of the engine. This concept is crucial for understanding how performance varies with altitude and the engine's ability to deliver power under different atmospheric conditions.

As altitude increases, the air density decreases, which directly affects engine performance. At full throttle height, the engine is still able to maintain the required boost pressure for optimal performance. It indicates the limit of the engine's capability to sustain that boost level before performance might degrade due to the thinning air. This parameter ensures that pilots and engineers understand how high they can operate the engine while still achieving efficient power output.

In contrast, the other options do not accurately encapsulate the definition of "Full Throttle Height." Each highlights different aspects of engine performance that may relate to throttle or boost characteristics, but they do not specifically address the maximum operational altitude at which a designated boost level can be maintained, making them less relevant in this context.