I was going through some of my covers and came across this Polish motor glider stamp FDC, part of a sports planes set issued on 15th April,1978. It features a SZD-45 Ogar motor glider with a wingspan of 17.6m & length of 7.95m.
Unlike an airplane, the engine in a motor glider is not a major source of propulsion and is used only for take-off and flying without thermal conditions. The engines usually have a capacity below 100 hp. 67 of the SZD-45 Ogar powered sailplanes were produced in Poland, out of which 41 were exported. The first one was flown on 29.05.1973.
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