O.S. Engines, .91 SZ-H PH-Hyper with Pump and Regulator

Hobbies R Us

OSMG1984      .91 SZ-H PH-Hyper with Pump and Regulator

TECH NOTES

This is the O.S. Max .91 SZ-H PH Hyper Helicopter Engine with Pump.

FEATURES: Redesigned crankcase provides better support for the crankshaft and
thrust bearings
New 60M 3-needle carburetor with mid-range needle for precise
adjustments and push/pull throttle arm for added precision in power
control
Front and rear ball bearing-supported crankshaft
Blue anodized cylinder head with "O.S." and "World Champion's Spec"
printed in White at the top of the head
Graphite backplate pump mount
Two year limited warranty

INCLUDES: O.S. Max .91 SZ-H PH Hyper Helicopter Engine with Pump with #8
glow plug, one .004" (.11mm) head gasket and one .008" (.22mm)
head gasket, decals, Woodruff key, needle adjust screw (2.6x5mm)
and instruction manual

REQUIRES: Fuel: 10%-30% nitromethane with at least 18% lubricant. Lubricants
may be either castor or synthetic oil or castor/synthetic blend.
Field Equipment: glow starter, fuel bulb, fuel can filter, fuel pump
hexagonal starting shaft (depending on brand of helicopter)
electric starter, battery and fuel tubing
Muffler- This is specific to the heli.

SPECS:    Displacement: 0.912 cu in (14.95 cc)
Bore: 1.02" (25.8mm)
Stroke: 0.87" (22mm)
Output: 3.3 ps @ 15,000 RPM
Practical RPM Range: 2000-16,000
Weight Without Muffler: 22.5oz (640g)
Height from crankcase bottom to top of cylinder head:  4.1"  (105mm)
Height/bottom of mounting tab to top of cylinder head: 3.4"  (87.4mm)
Distance between mounting holes same side:             0.98" (25mm)
Distance between mounting holes opposite side          2.04" (52mm)
Distance between muffler screw holes:                  1.6"  (42mm)
Distance/bottom of mounting tab to muffler screw holes: 1.7" (42.8mm)
Length from front of case to backplate:                3.3"  (84mm)
Length from backplate to end of crankshaft:            0.63" (116mm)
Width of crankcase below mounting tabs:                1.7"  (42.6mm)
Width between mounting tabs:                           2.4"  (61mm)

COMMENTS: High speed needle setting - 2-1/2 turns OPEN from fully closed
Idle mixture setting - set from the factory
Medium speed needle valve - 1-1/2 turn OPEN from fully closed

ACCESSORIES

THIS IS THE O.S. MAX .91 SZ-H PH-HYPER HELI ENGINE W/PUMP.
FEATURES: OS PD-07 PUMP FOR STABLE FUEL DELIVERY, 60M THREE NEEDLE CARBURETOR
NATURAL FINISH W/BLUE ANODIZED HEAD, #8 GLOW PLUG, MAX DISPLACEMENT
ALLOWED IN AMA SANCTIONED FAI F3C HELI EVENTS
REQUIRES: 10%-30% HELI FUEL, PLUG WRENCH