91VR-DF  | Specification:
- Displacement: 0.900 (cu in)
- Bore: 1.091 in
- Stroke: 0.965 in
- Practical rpm: 2,500-25,000
- Output: 4.8 @ 22,000
- Weight: 23.37 (oz) | 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
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Engines 
