NST BS 650
{{Short description|German aircraft engine}}
{{Use dmy dates|date=January 2022}}
{{Use British English|date=January 2022}}
| {{Infobox aircraft begin
| name= BS 650 | image= | caption= }}{{Infobox Aircraft Engine |type=Aircraft engine |manufacturer=NST-Machinenbau |designer= |national origin=Germany |first run= |major applications= |produced= |number built= |developed from= |variants with their own articles= }} |
The NST BS 650 is a German aircraft engine that was designed and produced by NST-Machinenbau of Niedergörsdorf for use in ultralight aircraft.Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, pages 260-261. Flying Pages Europe SARL, 2015. {{ISSN|1368-485X}}
By March 2018 the engine was no longer advertised on the company website and seems to be out of production.{{cite web|url = http://fliegermeister.eu/|title =
ALF – Altes Lager Fliegermeister |accessdate = 5 April 2018|author= ALF - Altes Lager Fliegermeister |work =fliegermeister.eu}}
Design and development
The BS 650 is a twin-cylinder four-stroke, Vee configuration, {{convert|630|cc|cuin|1|abbr=on}} displacement, air-cooled, petrol engine design, with a poly V belt reduction drive with a reduction ratio of 2.7:1. It employs dual magnetos and produces {{convert|35|hp|kW|0|abbr=on}} at 4200 rpm, with a compression ratio of 9.0:1.
Specifications (BS 650)
{{pistonspecs|
|type=V-twin cylinder, four stroke aircraft engine
|bore={{convert|76|mm|in|1|abbr=on}}
|stroke={{convert|70|mm|in|1|abbr=on}}
|displacement={{convert|630|cc|cuin|1|abbr=on}}
|length={{convert|400|mm|in|1|abbr=on}}
|diameter=
|width={{convert|3600|mm|in|1|abbr=on}}
|height={{convert|280|mm|in|1|abbr=on}}
|weight={{convert|33|kg|lb|1|abbr=on}}
|valvetrain=
|supercharger=
|turbocharger=
|fuelsystem=
|fueltype=petrol
|oilsystem=
|coolingsystem=air
|power={{convert|35|hp|kW|0|abbr=on}}
|specpower=
|compression=
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=
|designer=
|reduction_gear=poly V belt
|general_other=
|components_other=
|performance_other=
}}