Editing Motor glider (section)

===Sustainer motor gliders===
Sustainer motor gliders must be launched like an unpowered glider, but can climb slowly to extend a flight once the engine is deployed and started. They generally do not have an [[alternator]] or [[starter motor]], so the engine is started by "wind-milling" the propeller in flight. The propeller may be a rigid 2-blade design, or may have more than two blades that fold at the hub when the engine is retracted.  The propeller hub is usually attached directly to the crankshaft, but there is at least one example of a sustainer with a belt reduction drive, the DG-1000T.<ref>{{cite web|url=http://www.dg-flugzeugbau.de/index-e.html|publisher=DG Flugzeugbau|title=DG-1000T Information|access-date=24 November 2006|url-status=dead|archive-url=https://web.archive.org/web/20061205063859/http://dg-flugzeugbau.de/index-e.html|archive-date=5 December 2006}}</ref>

The smaller sustainer engines are usually not equipped with a throttle, but instead have a cable to open decompression valves in each cylinder to allow the engine to turn freely for starting. Sustainer engines are typically [[two-stroke]] two-cylinder [[air-cooled engine]]s in the range of 18–30&nbsp;hp (14–22&nbsp;kW). They are lighter in weight, and simpler to operate than self-launching powerplants.<ref>{{cite web|url=http://www.schempp-hirth.com/index.php?id=discus-2t&L=1|publisher=Schempp-Hirth|title=Discus 2T Sustainer Engine Information|access-date=24 November 2006|url-status=dead|archive-url=https://web.archive.org/web/20061016161425/http://www.schempp-hirth.com/index.php?id=discus-2t&L=1|archive-date=16 October 2006}}</ref>