I did the same. The aircraft parts are just so hard to use with the current parts and controls. I also noticed something weird. The propeller blade seems to create MUCH more lift than the wings ever can. I did some tests, and I came to the conclusion that air-speed passing over the wings has almost no effect. The biggest effect was at what angle the wings were tilted against the travel speed... (simulated air-resistance?) I tried making a flapping bird, and no matter how fast I flapped, the wings generated no upward force...

So far the best I've managed is a helicopter (of sorts) that basically works like a rocket. Don't fly too high or you'll freeze up! (literally)