Prop selection help please
 

i need your guys help i have a sig kobra with a 32sx with tuned pipe and i am in desprite need to know what is the best size prop
to use to get max mph
thanks

RE: Prop selection help please
 

The 32 SX works well on a smaller airframe with an APC 8 x 7.

For your plane - try an APC 9 x 6.

Or a Bolly 9.5 x 6.

Good luck.

RE: Prop selection help please
 

i used a OS32 (with a heli pipe) on a US40 and achieved max speed with an APC 9x7, took allot of runway to get airborne but top speed was clocked with a hand held at 104mph.

kc

RE: Prop selection help please
 

Nice little Kobra :)

prop selection has everything to do with how you pipe is set up.

What prop are you using now? What rpm? What is the pipe length set at ?

In general (without knowing the above info), the OS 32 likes rpm. I'd tend to work with an 8x7, 8x8, 9x6, and maybe even try the APC 8.5 x 7.25 q-500 prop - all depends on how the plane resonds to it.

Bob