Make your own free website on
OS .91 VR-DF
O.S. Ducted Fan Engines offer incredible performance and unsurpassed reliability. Designed to fit the popular ducted fan units, these ultra-high rpm engines feature ABC piston/sleeve construction for high compression and superior output. Developed to produce the high horsepower serious ducted fan fliers crave.
  • High speed performance characteristics

  • Glow plugs are required

Note: Due to their high-speed performance characteristics, O.S. does not offer a 2-year warranty on ducted-fan engines.

Displacement 0.900 (14.75 cc)
Bore 1.091 in (27.71 mm)
Stroke 0.965 in (24.5 mm)
RPM 2500 - 25000


4.8 BHP @ 22000 RPM
Weight 24.96 oz (707 g) (Heat sink)
23.37 oz (663 g) (Small head)
Price R Not Available
(available in heat-sink or small-head)