WYDAH No problem. One of my friends also just finished the Hellcat he went with the RCS 140. Fits great inside the cowl nice little 22cc gas motor with Electronic Ignition. Kind of wish I had done the same thing but it won't be as fast as my Hellcat. The Hellcat is very stable and tracks like it is on rails. flew mine for about 4 months before the repaint have no complaints. Can say that the original paint is very weak comes off easily watch when putting tape on it. It will pull paint off even using the good blue tape. But it makes a good base for new paint.