O.S. Engines, .91 RZ-Heli Ring Rear Exhaust

Hobbies R Us

OSMG1978      .91 RZ-Heli Ring Rear Exhaust

TECH NOTES

This is the O.S. Max .91 RZ-H Rear Exhaust Helicopter Engine.

FEATURES: Aluminum cylinder head, anodized blue in color
Designed for Hirobo and other scale helicopters where engine must fit
inside canopy to preserve heli's scale lines
Ringed piston
60M-C 3-needle carburetor with mid-range needle for precise
adjustments
Two year warranty

INCLUDES: O.S. Max .91 RZ-H Rear Exhaust Helicopter Engine with #8 glow plug,
instruction manual

REQUIRES: Fuel: Heli blend with 10-30% nitro content

SPECS:    Needle Settings;
High Speed Needle Valve: Two turns OPEN from fully closed
Idle Mixture Control Screw: Factory setting
Medium Speed Needle Valve: Two turns OPEN from fully closed

Displacement: 0.912 cid (14.95 cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Practical RPM: 2000-16,000
Power Output: 3.3 PS @ 15,000 RPM
Weight: 21.82oz (618g)
Crankshaft Size: 5/16-24
Distance Between Mounting Holes Same Side: 0.98" (25mm)
Distance Between Mounting Holes Opposite Side: 2" (52mm)
Distance From Back Plate to Front Bearing: 3.3" (83.8mm)
Distance From Back Plate to Crankcase Center: 1.1" (27.4mm)
Distance From Crankcase Center to Front Bearing: 2.2" (56.4mm)
Distance From Crankcase Center to End of Crankshaft: 3.5" (88.7mm)
Width at Mounting Tabs: 2.4" (61mm)
Width of Crankcase Below Mounting Tabs: 1.7" (42.6mm)
Distance from Throttle Lever to Center of Crankcase: 1.7" (42.5mm)
Distance/Bottom of Mounting Tab/Top of Cylinder Head: 3.4" (87.4mm)

ACCESSORIES

THIS IS THE O.S. MAX .91 RZ-H REAR EXHAUST HELICOPTER ENGINE.
FEATURES: DESIGNED FOR HIROBO AND OTHER SCALE HELIS TO FIT INSIDE CANOPIES,
60M-C 3-NEEDLE CARB WITH MID-RANGE NEEDLE, #8 GLOW PLUG
REQUIRES: FUEL, 10%-30% NITRO 18% OIL CONTENT, FUEL BULB, MEDIUM FUEL TUBING,
STARTER W/BATTERY, STARTING SHAFT & MUFFLER (DEPENDING ON HELI)