The first twin cylinder Zenoah engine, the GT-74 (formerly known as the Z-445) has become one of the premier engines in the Giant Scale Formula 1 and Biplane racing classes. It is ideal for such larger models as the 1/3 scale Extra 300S and new G-202, as well as the popular 30% Extra 300S and Cap 232. The GT-74 comes with an included spring starter and will turn a 24 x 10 prop at 7200 rpm.