acdii

I want to reduce the plans down to a scale that a pair of .91 4 strokes can fly it with. Any ideas what scale that could be? They are 1/7th scale and use about a 50-60CC engine. I plan to build this scale, have the wood cut, but that is quite some time down the road and want to try a much smaller one first as a sport scale.

TFF

80"? Most of the structure of the Ziroli is to handle those gas engines. It does not need to be as heavy duty with glow engines.

acdii

That comes out to about 1/10th scale, so the next step is to determine the reduction from the plans and get some copies made at the reduced size and go from there. I have a pdf of a Sterling P-61 that could be blown up as well, but it is pretty marginal for powered flight and would need some modifications to make it work. I can see quite a few places on the Z plans where I can lighten the plane, and use CF in some areas too. Since it would be sport scale, I can go with the long aileron version wing with minimal flaps and fixed gear.