Propellers for large stunt engines

[Robert Zambelli]

Many people prefer the PA and Rojett engines for stunt.
What are some of the popular prop sized for thse engines,
from .60 up to the .90 displacements?

Bob Z.

[Jim Pollock]

Bob,

What I was running on a ROJ .61 was a 13X3.75 flat back Brian Eather 3 blade.
I think that it would very well on the PA .61 as well. Also a 13X4.25 Bolly 3 blade cut to 12.5" would work good too.
I don't know a lot about the 75.-90 engines but I think David used a 13X4.5 3 blade on his WC plane with a PA .75.

I'm sure others will chime in here as well shortly.

Jim Pollock   

[peabody]

Check the Bolly prop chart that Randy has on his web site....

[Mike Greb]

I run a Zinger Pro 14-5 on my RoJett76. 

[peabody]

Noel Drindak's "We have the technology" column in the currnt issue of STUNT NEWS does a great job of citing prop choices...and these choices reflect the top flyers in the Country...

[Brett Buck]

Many people prefer the PA and Rojett engines for stunt.
What are some of the popular prop sized for thse engines,
from .60 up to the .90 displacements?

      12.5-13.5" 3-blades for 60-75s, 3.5-4" of pitch.

     Brett


p.s. For reference, David's 75 setup uses a 13-4 Eather 3-blade.

[RC Storick]

PA .75 I run a 15 inch two blade and a 13.75 X 4 three blade. If I could get a bigger 3 blade I would run it. The reason to run a bigger engine is to turn the biggest prop possible. Ask Randy Smith