I need your help!!!

It could be a number of things. We need more information, like what it is, a screenshot might help, did you give correct naming, pivots, parenting, etc.
 
Umm........is that an AP object, plane? Looks like a box to me. If its supposed to be an airplane, my guess is you'll need to define some physics of some sort. What are you trying to accomplish? Without all of the info I mentioned earlier, I'm still taking a shot in the dark. I don't even know what you made really.
 
I've never tried what you're doing, so this is really only a guess. With no wheels for ground contact, or flying surfaces (wings, horizontal, vertical), you have no control. In figuring RF is seeing your model setting on the ground with the propeller hitting the ground and bouncing it all over the place. If you're wanting to create a model, follow some of the tutorials that can be found on the forums. At least make some wheels and flying surfaces. Don't forget correct naming of parts as well.
 
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