Re: What 3 blade for a OS 52 four stroker?

Hello Don... I've found out by experment that the rule of going down one inch in length ond up one pitch is just not the way to go.. I use the same in two blade and three blade..11-7 two..11-7 three blade..... But the bottom line is that you just have to experment till you find one that works good for your application.........If you get inbetween sizes and find one isa litte too much for your motor you can shave off a little off the back of the blades to unload the motor a llittle.... works for me.In your case you can always go to a 11-8 or a 12-6.I think either one of these will work fine....Bobby

I once used a Graupner 12x ? (6 I think) 3 blader on my saito 50 and it was cool!! used to pull the plane (i.e taxi) on an idle of 2100rpm toped out at

I used Graupner 11 x 7 or 7.5 's on Saito 50's to power my Royall B-25. Never tached them but they flew the plane great.