Originally Posted by
n233w
As I understand it, 3 bladed props are good for braking, nothing else.
P-factor is probably the biggest factor making your plane pull to the left when pulling up.
Gyroscopic effect (probably extremely negligible with our light props) during a pull up acts with a yaw to the right, so is not involved.
http://www.rapp.org/archives/2008/09...ic-precession/
If you can envision a two bladed prop when it is horizontal and the aircraft is at a positive angle of attack you can see the descending blade on the right will exert a greater forward force and the blade on the left will exert a lower force than they do when the plane is at zero angle of attack, and that is why the plane yaws left. With a three blade prop the blades are never horizontal at the same time so I would expect the force couple would be lower. However, from the comments in this thread it doesn't sound as if anyone experienced this or even expected it.
Jim O