While you can strap a rocket onto your parkjet for all we care, we recommend the Park Jet Combo we have right on our site (http://www.6mmflyrc.com/power-gear). If you want more power or plan to build a little heavy, go with the Super Mega Combo. These combos are great for all our parkjets.

Now, if you want to build our F-22 Raptor or SU-37 per the instructions, you will need to pick up a Little Screamers Park Jet motor, http://www.hobby-lobby.com/littlescreamers.htm That is what the designer used and that is what our kit's thrust vectoring system is set up for, though with very little modification, you can make the thrust vectoring system work for any reasonably sized motor.