RE: 42"wingspan p51d what size engine?
Hi,
I have made over 15 fighters in that size range.
The weights of mine range from 2.6 to 3.75 lbs, depending on what I cram into the fuselage.
For power, I've used everything from an 0S .20 FP to a .40 four stroke for glow, and from 160 to 655 W for electric.
This being said, if your ready to fly weight is under 2 lbs, a .10 or 15 will do you fine. 2-3 lbs, .15 to .25 (32 if at 3500+ FT ASL, and plane weigh 3+ lbs..
If your plane likes to "snap roll" on landing approach, raise both ailerons 1/16" or so. On a tapered wing, this effectively increases the wash-out. I, personally, don't feel that this trait is a "given" on small Warbirds, and use an airfoil/washout combination that doesn't do that. Having spent 2 years testing it back in the mid 90's helped......
Laddie Mikulasko regularly covers with the brown paper method. He is famous for building light airplanes.
Sorry I didn't find this thread earlier.
I hope this helps.
Ron Daniels