I have a Hanger 9 UltraStick 40 with an OS FS 70 four stroke on it. This is my first 4 stroke and I don't think I'll ever go back. The engine performs great, sounded cool and the plane flies awesome. And as an added bonus cleanup is hardly anything compared to the messy 2 strokes.

If you're interested in hovering you should seriously consider a 4-stroke. They'll swing a larger prop, provide more torque and quicker throttle response than 2 strokes. In addition they will actually slow the plane down in a dive at low throttle (much the same as real planes do when feathering the prop).

Whatever you decide, I hope you enjoy your US40!

Keith