The NST BS 650 is a German

aircraft engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many ...

that was designed and produced by NST-Machinenbau of

Niedergörsdorf Niedergörsdorf is a municipality in the Teltow-Fläming district of Brandenburg, Germany. Demography File:Bevölkerungsentwicklung Niedergörsdorf.pdf, Development of Population since 1875 within the Current Boundaries (Blue Line: Population; ...

for use in

ultralight aircraft Ultralight aviation (called microlight aviation in some countries) is the flying of lightweight, 1- or 2-seat fixed-wing aircraft. Some countries differentiate between weight-shift control and conventional three-axis control aircraft with ailer ...

.Tacke, Willi; Marino Boric; et al: ''World Directory of Light Aviation 2015-16'', pages 260-261. Flying Pages Europe SARL, 2015. By March 2018 the engine was no longer advertised on the company website and seems to be out of production.

Design and development

The BS 650 is a twin-cylinder

four-stroke A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...

, Vee configuration, 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 at 4200 rpm, with a

compression ratio The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the stati ...

of 9.0:1.

Specifications (BS 650)

References

{{Reflist NST aircraft engines Air-cooled aircraft piston engines 2010s aircraft piston engines

Design and development

Specifications (BS 650)

See also

References