RE: Hempel 50% BD5 Build
I would not raise the engine, the bd has bad habits with raising the engine. When you hit over 1/2 thottle it will push the nose down. I have experieince with this from my bd's, due to the thrust line I had to lower (angle) the front half of the motor. After that it flew alot better and you didnt have to worry about losing (or having enough) elevator when trying to pull up. I would check with Hempel before you raise the engine.