| Features
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
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O.S. 91VR-DF Small Head
OSMG1891
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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
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Construction: Aluminum and
Aluminum alloys
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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
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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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