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Tower Catalog Page:	196
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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 (these fan units are typically
manufactured by the same people who make the plane kit - a company like
Jet Hangar Hobbies (562) 467-0260 )

FEATURES: Rear Exhaust                                                        .
          Schnuerle Porting
          2-piece Crankcase
          2-Crankshaft Ball Bearings
          Rear-Mounted Carburetor
          Drum Rotor Induction
          ABN piston/cylinder (aluminum piston with a nickle plated brass
            cylinder
INCLUDES: 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!)

SPECS:    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

          Needle Settings: High Speed: 2 turns out from fully closed
                           Low Speed:  2mm gap between the needle and spray bar
                                       (looking down neck of carb) at full
_                                      throttle.

REQUIRES: Glow Plug (O.S. #8 or #9 (OSMG2691 is recommended)
          Tuned pipe (we don't carry, contact the manufacturer of the kit).
          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.
                                                                    JBN 9.23.93
                                                                          ir/jl
ADDITIONAL COMMENTS:  It is suggested that the cutomer uses a Ramtec fan unit
                      as opposed to the Dynamax unit. The Ramtec has a much
                      higher pitch which "loads" the engine better.
                                                               updt lmm 4/14/09



– If you need more information, use these O.S. resources –

Click Here: Manufacturer's Product Web Page
E-mail: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970


 
Postal Address:
O.S.
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822  








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