Hey Guys!! I even went so far as to try and get the plans for the Sport version of the Superkraft cap [the one with the longer tail] so i could blow them upscale and make a bigger plane for a gasser engine, But they are a closely guarded secret like everything else in China. Saito 100 with a 15-6 zinger gives me excellent vertical here in Logan, Utah. Elevation 4,500 feet