I put this plane into moto calc with both the razor and the MP jet motors. They both supposedly worked with the 12x6 on the 4.1:1 ratio of the MP jet gearbox, and performance was theoretically very good with both. I put the razor to the 6:1 and it liked that also, but the MP Jet had too little current draw at full throttle so that it was going to be less eficcient. I think I got it though, the Razor has a hotter wind according to motocalc and so has less torque. The MP Jet seems to be more similar to the Razor rz-400. I plugged this motor in and got the same results as the MP Jet. The MP JEt has a Maximum rpm per volt of 3850, the Razor has a maximum of 4200. The MPJet has a twenty turn winding, how many turns does the razor have?