If you're not locked in on the idea of a V-22 scale model, there are some simpler approaches, along the lines of the last couple posts. Many years ago, an engineer friend of mine and I really got the bug to design and build a V-22 model, and after we talked it over, we ended up deciding we couldn't do a faithful V-22 with our resources. We did think we might have a chance of taking off and landing vertically, using control surfaces which are being blown by the prop. You need to be able to control the thing a little bit, but I don't think you need to be able to do everything a helicopter or V-22 can do. Taking off is fairly simple, if you over-power the thing and use a prop which favors static thrust. For landing, you can picture going into a stall that ends up being a hover. At this point, you need to have at least some ability to move the thing laterally. We thought you could have a special control surface, not unlike flaps, near the wing root, which gives some side thrust. To 'steer', you need to make sure that the ailerons have some authority, or else have some differential in your 'thrusterons'. Needless to say, we never built the thing, and it's a far cry from a cool, scale V-22, but it might be a simpler way to get VTOL.

Have fun.

banktoturn