ORIGINAL: RFJ
Jim,
Good to hear from a fellow Troublemaker fan. Mine is about half completed and is built from a J&J Industries kit plan plus additional information very kindly supplied by Freebird.
Just to make things clear the plan shows a small "balance range". In the scan below the forward limit is 130mm from the leading edge and the rear limit 140mm.
I had planned to use an Enya 61CX in mine but didn't appreciate how small the model was until I built it. I think my Enya 50CX will be more than adequate. It's entirely up to you of course but personally I don't think a four stroke would suit this model.
Ray
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Nothing wrong with using the .50CX, but don't over estimate the .61CX (actually a .58).
My favorite of the group of CX engines is the .45CX, because of its AAC piston/liner. I haven't compared the two against each other (.45CX & .60CX), but I'd be seriously surprised if the .50CX turned out to be as strong as the .45CX where it counts - in the air with the model going straight up.
I'm sure that many folks will see the .61CX as a dog, once experienced. But you have to keep in mind that it is a glorified .50CX and not a real .61 sized engine. It has its place and that place is not being compared to other full size .61 CID engines. That's what the .61 XF4-C engines are for. 8>
I wish Enya would return to using the AAC technology. That alone was what made the .40 & .45 CX engines outstanding in the first place.
Ed Cregger