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Flight performance and planning

7.6.2 Propeller pressure

Propeller pressure (or just pressure) is at its highest when the plane is stationary,

and the engine is at full throttle. As the plane gains speed, the propeller pressure

decreases.

Propeller pressure is a static quantity that is not related to time.

Where the distance to the “power required” curve / drag curve is greatest, we

find Vx, which is the speed for best climb angle.

The speed for least drag is where the curve is lowest.

The speed for best range is the point where the tangent touches the curve. It is

only in no wind that the tangent is drawn from the intersection of the axes.

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7.7 Engine failure

If you have an engine failure, there is a certain speed at which the aircraft glides

the longest distance.

7.7.1 Best glide distance

This is referred to as the “best glide speed”. The best glide speed can be found in

the aircraft manual.

This speed also depends on the weight of the aircraft. Since all data in flight

manuals is at full weight, remember that the lower the weight, the lower the glide

speed.

Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 638