I have a ROO with a Simjet 3000 that delivers 14,5 kg of thrust. (127 000 rpm) And thats why they call me the Rocket Man. But it flyes like a dream. You can just set the turbine down to low position and you should have no problems. The Simjet 3000 is such a nice engine for so many different planes so why buy anything smaller now, and then you might need a 3000 to your next project?

Christian