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  Electric Motors, Engines & Accessories > Engines Glow Fuel > Engines R/C Glow Fuel Helicopter 2-Stroke - .52 & Up Bookmark this Page

O.S. - OSMG1961 OSM18750 18750 531028021884 4531028021884
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Easy RC: Engines

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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: 198

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Late Apr

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Tech Notes
     This is the 105HZ-R DRS 1.05 cu in Helicopter Engine from O.S. Engines.

FEATURES: 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 purchase

INCLUDES: 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

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

SPECS: 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 factory 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 ir/jxs

– If you need more information, use these O.S. resources –
Web Site:
Phone: 217-398-8970
  Postal Address:

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Accessories Needed

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

      Optional Accessories
  Special Stock Number Product Description Parts Saver Eligible Tower's
Low Price
Click to Order Quantity Needed In Cart? Stock
 LXGHB4 Cool Power 15% Heli Fuel Gallon (4)
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84.99   In Stock
Limited Quantities
 LXDBPE Great Planes After Run Engine Oil 2 fl oz
Qty Discount Available
3.49   In Stock
 LXWZB5 O.S. #7 Glow Plug Medium Hot Air
Qty Discount Available
5.49   In Stock
 LXBUCJ O.S. PowerBoost Pipe 105HZ
Qty Discount Available
269.99   In Stock
 LXXF25 O.S. Bubbleless Clunk
Qty Discount Available
15.99   In Stock
 LXXF27 O.S. Super Can Filter Large
Qty Discount Available
9.49   In Stock
 LXXF06 O.S. Lock Washer 4mm
Qty Discount Available
13.49   In Stock
 LXCX20 O.S. Long Socket Wrench With Plug Grip
Qty Discount Available
11.99   In Stock
 LXJA89 Tower Hobbies TOWER Power Glow Plug
Qty Discount Available
5.49   In Stock
Subtotal for this Group of Accessories: 420.41  

      Optional Accessories

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