Most of the combat discussed here does not involve Jets or crashing into each other. The 2 most popular methods are 1) Cutting crepe paper streamers from each opponant's plane. Or 2) Electric planes that use a module to cut power to the opponants plane.
More info here:
http://www.rccombat.com/rcca.asp
And here:
http://www.rcuniverse.com/forum/Elec...mid_106/tt.htm
HTH,
D