I guess I jumped the gun on the engine selection, it's being recommended that I put an 85 cc engine up front. For some of the engineering types out there, the front end has a 1/4" firewall with balsa longerons and balsa sheeting that go from the firewall back to the windshield. I would imagine I'd need replace the 1/4 x 1/4" balsa longerons with spruce and go with a 1/2" firewall and some plywood sheeting around the top area to replace the balsa sheeting too. Any advice will be greatly appreciated ! With a projected 30 lb. weight for the finished model I guess the 85 would be a better choice.
Not sure about prop clearance with a DA 85, I'm hoping it'll have enough for a 25" three blade.