I flew my 4 star with a Fox .50. It was a wonderful airplane. Two suggestions. First, mount the engine as low on the firewall as possible to get the car on the same level as the fuel tank for a more consistent fuel draw. and second put some triangle stock around the landing gear mount. Not that my landings were the smoothest in the world but I managed to skim the gear off of a 4 star 40 and a 4 star 60. It is a great everyday flier and you should have a lot of fun with it.