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O.S. - OSMG1961 OSM18750 18750 531028021884 4531028021884
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O.S. 105HZ-R DRS Heli Engine
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O.S. 105HZ-R DRS Heli Engine
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On-line Videos: Video 1 (32.4 MB) Video 2 (YOUTUBE)
Instruction Manuals: Manual 1 (4.5 MB)
Tower Catalog Page: 168

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Tech Notes
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 5/16-24
Carburetor Settings;
High Speed Needle Valve: Approx. 2-1/2 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
Distance/Center of Mounting Holes Same Side: 0.98" (25mm)
Distance/Center 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)
Height/Bottom Mounting Tabs to Muffler Mounting Holes: 1.7" (42.8mm)
Height/Bottom 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 01/30/12

– If you need more information, use these O.S. resources –
Click Here: Manufacturer's Product Web Page
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
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Accessories Needed

Accessories for the O.S. 105HZ-R DRS Heli Engine

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 LXGHB4 Cool Power 15% Heli Fuel Gallon (4)
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99.99   In Stock
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3.49   In Stock
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5.49   In Stock
 LXBUCJ O.S. PowerBoost Pipe 105HZ
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269.99   In Stock
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15.99   In Stock
 LXXF27 O.S. Super Can Filter Large
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9.49   In Stock
 LXXF06 O.S. Lock Washer 4mm
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13.49   In Stock
Limited Quantities
 LXCX20 O.S. Long Socket Wrench With Plug Grip
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11.99   In Stock
 LXJA89 Tower Hobbies TOWER Power Glow Plug
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4.99   In Stock
Subtotal for this Group of Accessories: 434.91  

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