Contents
What makes the left engine critical?
The longer arm from the right engine’s Center of Thrust makes it more effective at rolling the aircraft into an inoperative left engine. Thus, making the left engine critical. Accelerated Slipstream also deals with Pitch. The accelerated airflow from the left engine flows over the elevator/stabilator.
How far should the prop be under the boat?
If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches. For a long shaft, I think 20 to 21 inches is correct.
Why does an aircraft have a higher p factor?
To attempt to paraphrase, it occurs when your aircraft is operating at high angles of attack. Just like the advancing blade on a helicopter produces more thrust because it’s heading upwind, the descending blade of the propeller produces more thrust because it has a higher angle of attack relative to the aircraft’s motion through the air.
What is the P factor of a propellor?
Note that the rotational component of the prop wash will cause a similar effect when it hits the rudder at an angle, adding to the leftward tendency of the plane. P factor stems from the fact that the downward side of a propellor generates more thrust than the upward side (because of the helix like nature of the air flow).
When does the P factor of an engine cancel out?
For multi-engine aircraft with counter-rotating propellers, the P-factors of both engines will cancel out. However, if both engines rotate in the same direction, or if one engine fails, P-factor will cause a yaw.
When does P factor increase during ground roll?
P-factor is insignificant during the initial ground roll, but will give a pronounced nose-left tendency during the later stages of the ground roll as forward speed increases, particularly if the thrust axis is kept inclined to the flight path vector (e.g. tail-wheel in contact with runway).