O.S. 105HZ-R DRS 1.05 Helicopter Engine

Tower Stock# LXBUUE  •  Manufacturer Stock# 18750
Notes from our tech department:
This is the 105HZ-R DRS 1.05 cu in Helicopter Engine from O.S. Engines.


Same mounting dimensions as a .90 cu in engine
Machined blue anodized aluminum heatsink cylinder head
Velocity stack increases airflow and enhances engine performance
Pressurized DRS (Demand Regulator System) ensures consistent fuel
flow regardless of the helicopter attitude
Backplate accepts the Futaba BPS-1 RPM sensor for the GY701 and
CGY750 gyros
Ideal bore and stroke ratio for lowest vibration
Two year limited warranty through Hobby Services beginning at date of


105HZ-R DRS 1.05 cu in Helicopter Engine with 61G Carburetor
8 Glow Plug
Air Funnel
Check Valve
0.1mm Head Gasket
0.2mm Head Gasket (installed)
Instruction Manual


Fuel: Heli blend with 15 nitro content
Glow starter and field equipment


Displacement: 1.048 cu in (17.17 cc)
Bore: 1.142 (29mm)
Stroke: 1.024 (26mm)
RPM Range: 2,000 - 16.500
Output: 3.7 ps 15,000 RPM
Weight: 21.46oz (608g)
Crankshaft Size: UNF 516-24
Carburetor Settings
High Speed Needle Valve: Approx. 2-12 turns open from fully closed
Medium Speed Needle valve: 1 turn open from fully closed
Idle Mixture Control Screw: At basic position when engine left
DistanceCenter of Mounting Holes Same Side: 0.98 (25mm)
DistanceCenter of Mounting Holes Opposite Side: 2.04 (52mm)
Crankcase Width Below Mounting Tabs: 1.7 (43mm)
Crankcase Width at Mounting Tabs: 2.4 (61mm)
Width from Throttle Arm to Center: 1.6 (42mm)
Height from Bottom of Mounting Tabs to Cylinder Head: 3.1 (79mm)
HeightBottom Mounting Tabs to Muffler Mounting Holes: 1.7 (42.8mm)
HeightBottom of Crankcase to top of Cylinder Head: 3.9 (99mm)
Length from Backplate to Front Bearing: 3.2 (82.6mm)
Length from End of Crankshaft to Center of Engine: 3.5 (88.7mm)

jxs 013012



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