Abstract: In a rear wheel suspension system for a model racing car, the motor, rear axle and rear wheels are all supported from a supporting platform which is spring mounted to the chassis via the intermediary of a pair of springs, preferably coil springs, disposed in laterally spaced positions on opposite sides of the longitudinal center line of the chassis. A third point of attachment between the supporting platform and the chassis is provided at a point longitudinally spaced from the pair of mounting springs. The suspension system is so arranged as to permit a relative twisting action between the mounting platform and the main portion of the chassis so as to permit twisting or rotation of the supporting platform about both the longitudinal axis of the chassis and an axis transverse to the chassis, whereby independent suspension of the wheels is obtained relative to the chassis for improved stability and traction.

Abstract: In a muffler for a two-cycle combustion engine of the type commonly used to power miniature aircraft, cars, boats and models, the exhaust gas is directed into an expansion chamber for expansion and cooling, thence through a series of spaced baffles in a baffle chamber, and thence through a nozzle to the atmosphere. The baffle plates may comprise one or more different types having different sonic wave reflective characteristics and different impedances to gas flow. The baffle plates are spaced apart by one or more of a number of spacers providing different axial spacing between the baffle plates. THe baffle plates and their spacings are chosen by the user so as to obtain the required degree of muffling with the least amount of back pressure on the engine, as back pressure reduces engine power. The user is supplied with a kit having the various different type baffles and spacers.