O.S. 65AX Glow-Powered Aircraft Engine with Advanced Bimetallic Liner and E-4010A Muffler The perfect power plant for trainers, sport planes and scale aircraft, offering outstanding reliability and easy tuning. Mounts in the same space as the 61FX while being 1.9 ounces lighter and delivering 5 percent more power! Compatible with a wide range of propellers and the E4050 In-Cowl Muffler (OSMG2842), which offers a choice of side or inverted exhaust outlet angles. Pair with Tower Hobbies TOWER Power 10% Airplane Fuel (TOWP1600, sold in quarts) for optimal results. Comes with a two-year limited manufacturers warranty.