OS 91FX

[David Gundling]

What is the story on the 91FX. I have seen guys reporting
 that they are running up to 15 inch props. Reports of running
 a 14-10 are common. Is this with the muffler or is it obyained only with a
tuned pipe? The factory 
recommended prop is something like a 13-8.On RC Universe there has
 been a love/hate situation with the engine. Some report no troubles.
Others can't get it to run well
despite numerous efforts and parts changes. Is this thing as strong as a
YS91?

Thanks.

Dave  
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