I've been flying Contra equipped planes from late 2012 until the end of last year. This year I've been trimming and trimming a Nuance with a single 21x14 Falcon prop.
One thing that is really bugging me is the amount of rudder required during pulls and pushes. Once the plane is vertical it stays put very well but it really veers to the left during a pull up. I'm attributing most of this to P-Effect. I've noticed a lot of guys have gone to 3 bladed props ( I'm not sure if it's for this reason) but I would think this might reduce the P-Effect. So my question is, can anyone tell me if they have determined that 3 bladed props are really better, for curing this or other problems?
Jim O
Jim,
Your problem is nothing to do with the contra or three bladed/ two bladed prop.
Your problem is most likely related to misalignment or twists in the surfaces. I would get yourself some accurate and repeatable measuring tools and check the wing/stab incidence at the root, mid span and tip.
Straighten your model and the rudder corrections will mysteriously vanish.
Cheers,
Jason.