Hi Matt. I am using the Robert 550 in this one but it was built before there was instructions. So the correct gear is the Yellow Aircraft or the Robert 530 the difference being the way the air cylinder goes. As far as the speed-brake on top it is not much use. I have found when deployed the Aircraft will drop off to the right. It is properly the hinge twisting. The problem on how to get it slow enough for landing is the thrust at a idle is enough to keep it flying. Someone wanting to use a turbine like the P80 or simular turbine would make this worse. Paul JPOFL