I've ordered plans from Flying Models for their electric R/C Laird Solution profile bipe. I have ALWAYS loved this airplane.

As drawn it's got a 29" wingspan. I'm thinking about upsizing it about 25% to come out with about a 36" wingspan. Both wings ought to have a total area of about 500 sq inches by my guestimate. I was thinking about powering it with something in a .35-40 size engine. Too much or too little?

Since it is supposedly designed for electric R/C I'm guessing I'll need to reinforce some of the stress points - engine mount, wing mounts, etc. I plan to mount the bellcrank in the center of the fuselage and run the leadouts through the wing strut.

Does anyone have any suggestions for building a profile biplane that I need to bear in mind?

Thanks in advance

CG should be a little ahead of where you'd think.

Boy, that's pretty vague isn't it?  How about "A little behind the LE of the leading wing"?

Point being, bipes tend to be very sensitive, i guess all that wing area, or perhaps it's a function of all that LE--someone recently had some remarks about inches of LE per oz. of weight, a bipe would have lots!  I built some triplanes that required balancing 'way up, on LE of foremost wing IIRC, to tame them down.

--Ray

I didn't know there was scale racing. That sounds like fun!