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Scheibe motor glider manual6/12/2023 ![]() The fuselage doors over the engine and propeller bay are automatically opened and closed when the engine is raised or retracted. The engine is raised and retracted manually by a crank-driven draw chain-pushrod system, swinging upward and forward into the operating position. The fuselage center section has also been modified, increasing the overall length to accommodate the engine which, when retracted, lies inside the fuselage behind the wings. ![]() The wings and control surfaces are strengthened internally. The construction of the SF-27M is similar to that of the SF-27. ![]() In addition, the main wheel tire size is increased to 5.00 x 5. The main difference arises from the additional weight of the engine installation, amounting to approximately 88 lb (40 kg). Since the power plant is retractable, the SF-27M has about the same soaring performance as the normal SF-27 Zugvogel V high-performance sailplane. Remarks by Johan Visschedijk: "The SF-27M is a single-seat powered sailplane with a retractable power plant which makes it capable of self-powered take off as well as normal launching by winch or aero-tow.
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