open B props

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Fred420
Posts: 277
Joined: Thu Feb 10, 2005 8:36 am
Location: USA

open B props

Post by Fred420 »

I am going to be flying open B at the Nat's and am going to use my Limited B planes without any mod's. No can or pipe. I just want to get a little more speed out of my FX-25's by changing prop size.

So...............what are the recommendations for this?



Thanks.
Dave "Sparky" Davis
RCCA #870
"Earth is the insane asylum for the universe"
"May you be poor in misfortune, rich in blessings, slow to make enemies
and quick to make friends. But rich or poor, quick or slow, may you
know nothing but happiness from this day forward. The way you lived yesterday determined your today.
But the way you love today will determine your tomorrow."
combatgoblin
Posts: 244
Joined: Sun Jan 08, 2006 11:20 am

Re: open B props

Post by combatgoblin »

I use A.P.C 8x4, 8x5 props when I run stock motors in open B.
Don Fourson 386
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lightning
Posts: 1444
Joined: Sun Jan 19, 2003 10:53 pm
Location: USA

Re: open B props

Post by lightning »

Hi Dave, what have you done with your mufflers?
Hopefully you have removed the baffle already.
I also remove the stinger and open up the remaining hole to about 3/8".
Perfectly legal for Open B, Limited B and 2548.
After spending almost $200 on mousse can headers last year I am using modified stock mufflers everywhere.

FWIW I run MA 8x5 props in Open.
30% nitro fuel will wake up an OS 25FX but make sure the head shim is still in or you may run into pre-ignition issues.
Keith Jones
AMA CD #7601
Radio Control Club of Detroit
and proud member of the OGC
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