dsbarno wrote:

Will be putting a 20b in a cessna 185 look alike, a murphy super rebel.
Murphy recommends a 250  hp lycoming for the top end of power.  Some
guys are putting the russian mp 14 radial at 360 hp and are driving
murphy nuts. Its heavy, thirsty, and I'm not really sure of its
realiablity or tbo. Flew the super rebel at almost gross, at a field
that was at 1000 ft.  I'm building this as a bush plane, light, but with
more hp, especially when flying out of some of Idaho's fun airstrips.

Possibilities (as I see them, jump in at any time)

1 270 hp turbo.  No firewall modifications, no heavier windshield

2 300hp na.  Simpler, minor firewall modifications, heavier windshield

3 350 hp turbo.  More complicated, firewall modifications, heavier
windshield, probably wouldn't use it at 100 % power at all.  Thirsty,
but alot of fun.

Barny

Sounds doable Barny. How long is the cowl firewall to prop flange?
You might have to extend the cowl a bit for a three rotor.
Would probably improve the looks of the Murphy Super Rebel.
I would go with 1 as the gear box could be a problem at 350 HP. 
Better high altitude performance as well.

The Marcotte might be a better choice for a three rotor bush plane. Slightly
more reduction for a bigger prop and a bit shorter than a C6 based
gear box.

Paul Lamar
 
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