O.S. 91VR-DF Small Head OSMG1891
The O.S. Ducted Fan Engines are designed to develop high power at high RPM.
These are used in Jet (ducted fan) Models where the engine drives a turbine-like impeller (compressor) that draws a large quantity of air through a shroud to create thrust.
These engines are NOT covered under the O.S. 2-year warranty.
Because this is a high-performance engine, reliability is sacrificed.
The Ducted Fan does NOT come with this engine. One must purchase the fan to fit BOTH the engine size and the specific plane
Features
O.S. 91VR-DF Small Head OSMG1891
Rear Exhaust
Schnuerle Porting
2-piece Crankcase
2-Crankshaft Ball Bearings
Rear-Mounted Carburetor
Drum Rotor Induction
ABC piston/cylinder (aluminum piston with a chromed brass cylinder)
Specifications
Construction: Aluminum and Aluminum alloys
Displacement: 0.91 cu in
Bore: 27.7mm (1.09")
Stroke: 24.5mm (.97")
Max Output: 4.8 BHP at 22,000 RPM
Practical RPM Range: 2,500 - 25,000 RPM
Weight: 662g (23.4oz)
Length: 133.5mm (5.26") from carb intake to front of drive washer
Width: 43.5mm (1.71") neglecting the engine mounting flanges 52mm (2.05") distance between mounting hole centers
Height: 103.3mm (4.07")
Crankshaft: 5/16-24
Package Contents
One Assembled .91 VR-DF Engine w/small head
One Set of Instructions and Poster
One Exhaust Adaptor w/screws and O-ring (OSMG2709)
Bellcrank for use with the remote needle assembly (OSMG7258-comes with the engine!)
Requirements
low Plug (O.S. #8 or #9 (OSMG2691 is recommended)
Tuned pipe
Fuel with 20% MINIMUM lubricant content and 20%-50% Nitromethane
Wildcat Ducted Fan fuel exceeds these requirements
Comments
This engine is the "small head" version of the .91 VR-DF engines.
This engine is designed to operate where space is at a minimum.
This engine works w/ Dynamax or Turbax fan units.
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