I can now answer my own question. I have flown the Messerschmitt Bf-109, the Spitfire, the P-51 and the FW-190. All of them fly great. The modular power system plugs in and out of the various air frames without any problems, and provides plenty of power. I have purchased three of the power cores and all three work well. All in all, I'm very happy with the system and the air frames. Thanks; Ernie P.