I posted this also in the scratch Building forum but thought I would check here also for advice.

I picked up a old set of Air trails Magazine plans for a Martin B-26 Maurder that was originally designed for control line use.

Does anyone have any idea if any modifications are normally needed when converting a control line model to RC use? CG's, wing incidence? It called for 4 degrees of incidence, I believe to match the original scale outline.

Any other ideas or suggestions would be appreciated.

Thanks.
Jim

usually controline plan are somewhay small for r/c especially multi engine as the wing area is small creating a high wing loading.the engines are larger in contoline than needed for r/c and the wing incidence should be reduced by about half.what size plans of the b-26 marauder are they as there is a 72" span for twin .40's available from flying models allready designed for r/c

Look those plans over carefully... measure the 'inside' wing. Lots of times, the wing inside the circle is a bit longer in order to keep line tension high. Other than that, go for it. I've often thought about building a profile from a Flite Streak kit i've got up in the rafters!

Being a scale plan it likely won't have the "usual" CL oddities with it but it sure wouldn't hurt to check for them.

The older generation of CL scale models like you're looking at here are almost always grossly overbuilt for RC use. If you know what you're doing you can likely cut the wood sizes down to 1/2 to 2/3 the thickness in all cases. Otherwise you risk a seriously overweight model. The engine sizes shown on the plan will also be grossly oversize for RC use.

But aside from the weight issue you'll want to follow through with the usual scale model requirements to check the outlines against a number of scale drawings to confirm that the plans are as close as you want or need to a proper scale model. If it's for sport scale flying then there's no need for that obviously.