I have been a long time fan of Bruce Tharpe kits, I built one of his early, (1994) Venture 60 kits and powered it with a Saito 72. Sadly the right aileron servo locked in the down position and it spiraled into a concrete road in the Engineering Proving Grounds at Fort Belvoir, Va. The plane was splintered and the Saito 72 was crushed. Mr. Tharpe has built special planes for government projects and for some Docu Series such as Storm Chasers. This BTE Super Hauler was used to chase tornados and drop probes/sensors into tornados. It sounds as if it has a two cycle gasoline engine. I could not find any specs for it on his website.
Bruce Tharpe Engineering
BTE also builds a Jet called the Reaction 54, it makes 125 to 140 mph depending on your choice of engine. Slow compared to the one Jim showed, but probably more fun.