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General control line discussion => Open Forum => Topic started by: Robert Zambelli on September 30, 2008, 02:39:47 PM

Title: Propellers for large stunt engines
Post by: Robert Zambelli on September 30, 2008, 02:39:47 PM

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.

Title: Re: Propellers for large stunt engines
Post by: Jim Pollock on September 30, 2008, 04:11:43 PM

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   H^^

Title: Re: Propellers for large stunt engines
Post by: peabody on September 30, 2008, 04:48:58 PM

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

Title: Re: Propellers for large stunt engines
Post by: Mike Greb on September 30, 2008, 07:19:15 PM

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

Title: Re: Propellers for large stunt engines
Post by: peabody on October 01, 2008, 06:03:42 AM

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...

Title: Re: Propellers for large stunt engines
Post by: Brett Buck on October 01, 2008, 10:12:26 PM

Quote from: Robert Zambelli on September 30, 2008, 02:39:47 PM

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.

Title: Re: Propellers for large stunt engines
Post by: RC Storick on October 02, 2008, 08:24:14 AM

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