A revised version of OS’s popular 91 pumped engine has just become available!
This is the O.S. .91HZ-PS 3D Helicopter Engine with Pump and 61B-PII Carburetor features a revised pump diaphram for improved fuel regulation and consistency.
FEATURES: PD-08 pump works with a matched 61B-PII carburetor and integral regulator attached to carburetor to deliver a steady fuel supply at any altitude. Short rectangular heatsink can be entirely enclosed inside cooling shroud to lower operating temperatures. Newly designed piston and crankshaft further reduces vibration and improves torque stability over entire RPM range. Two year limited warranty through manufacturer beginning at date of purchase
INCLUDES: O.S. .91HZ-PS 3D Helicopter Engine with Pump, 61B-PII Carb, #8 Glow Plug, instruction manual
REQUIRES: Fuel: 15% heli mix Glow igniter, glow plug wrench and field equipment
SPECS:
Displacement: 0.91 cu in (14.95 cc)
Bore: 1.09 in (27.7mm)
Stroke: 0.98 in (24.8mm)
Practical RPM: 2,000 – 16,000
Power Output: 3.4 hp @ 15,000 RPM
Weight: 1.4 lb (635g)
Height from crankcase bottom to top of cylinder head: 4″ (103mm)
Height/bottom of mounting tab to top of cylinder head: 3.2″ (81.2mm)
Distance between mounting holes same side: 0.98″ (25mm)
Distance between mounting holes opposite side: 2.0″ (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″ (83.8mm)
Length from pump to end of crankshaft: 5.1″ (131mm)
Width of crankcase below mounting tabs: 1.7″ (43mm)
Width between mounting tabs: 2.4″ (61mm)
Needle Settings:
High Speed: Two turns open from fully closed
Mid Range: One half turns open from fully closed Mixture Control
(low speed): Pre-set at factory
Sourced from TowerHobbies.com
