The SPAD Gnat is the club combat plane of choice at our field. We have some powered with OS LA, Thunder Tiger, Magnum, Norvel, and mine with an OS .15 CVA. The most powerful engine of the bunch by far is the OS .15 CVA. Our only engine rule at our club is that it must be a .15 size engine. Just remember, you are either chasing or being chased in RC combat, which do you want to be? Go with the speed baby!!!!