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Most motor gliders are equipped with a propeller, which may be fixed, feathered (e.g. AMS-Flight Carat), or retractable.However jet engine-powered motorgliders are now available from some manufacturers, some of which are intended for use only as "sustainer" engines, i.e. for sustaining gliding flight rather than as self-launching aircraft.
The Carden–Baynes Auxiliary was the first motor glider with a retractable engine and propeller; it is known as the Abbott–Baynes Scud 3 when engineless. Both aircraft, built in the mid-1930s, were still flying in 2010 as pure sailplanes.
A pusher aircraft is a type of aircraft using propellers placed behind the engines. Pushers may be classified according to lifting surfaces layout (conventional or 3 surface, canard, joined wing, tailless and rotorcraft) as well as engine/propeller location and drive. For historical interest, pusher aircraft are also classified by date.
The Stemme S6 is a two-seat touring motorglider manufactured by Stemme AG.Unlike the S10, the S6 has a non-retractable three-bladed propeller (that can feather, like other touring motor gliders), a wider fuselage design, and tricycle landing gear, available both with fixed and retractable configurations.
The engine (based on a Porsche air-cooled car unit) can be shut down in flight with its propeller blades feathered. The aircraft then becomes a pure glider, with a best glide ratio of around 1:28. The Porsche-derived horizontally opposed air-cooled engine had the cylinder bore increase by Grob to make the engine 2.5-litre capacity and has had ...
This is in contrast to other motorgliders which mostly either store the propeller inside the fuselage, or merely feather the propeller blades. The Carat's propeller is opened by the centrifugal force on the turning blades, working against a folding force provided by a gas damping spring mechanism. [ 1 ]
The engine is a 19 kW (25 hp) Zanzottera MZ-35R, which is a special narrow engine design developed specifically for retractable engine motor gliders. The engine retracts rearwards into a bay behind the cockpit and is closed by two doors for drag reduction. The propeller is a two bladed wooden design of 1.18 m (46 in) diameter.
A foot-launched powered hang glider. A foot-launched powered hang glider (FLPHG), also called powered harness, nanolight, or hangmotor, is a powered hang glider harness with a motor and propeller often in pusher configuration, although some can be found in tractor configuration.