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105HZ-R DRS 1.05 Helicopter Engine

Item No.
OS Engines - OSMG1961
$668.93
Save $130 with Code AUTUMN. Ends 10/2. .
Sale | In Stock
Brand Logo
4 out of 5 Customer Rating

105HZ-R DRS 1.05 Helicopter Engine

Item No.
OS Engines - OSMG1961
$668.93
Save $130 with Code AUTUMN. Ends 10/2. .
  • 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
Product $668.93
Add Ons
Estimated Total: $668.93

105HZ-R DRS 1.05 Helicopter Engine

Item No.
OS Engines - OSMG1961
4 out of 5 Customer Rating
Product $668.93
Add Ons
Estimated Total: $668.93
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Product Details

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In The Box
  • (1) 105HZ-R DRS 1.05 cu in Helicopter Engine with 61G Carburetor
  • (1) #8 Glow Plug
  • (1) Air Funnel
  • (1) Check Valve
  • (1) 0.1mm Head Gasket
  • (1) 0.2mm Head Gasket (installed)
  • (1) Product manual
icon-how-to
Needed to Complete
  • Fuel: Heli blend with 15% nitro content
  • Glow starter and field equipment

Huge power and performance!

In order for 90-sized machines to nail huge maneuvers and hardcore, smackdown-style 3D it's all about power, and the 105HZ-R has it in abundance. Displacement has been increased by 15%, while a huge venturi rams air into the carburetor, producing massive power. Plus, it fits in a .90-sized mounting pattern!


O.S. Two Year Limited Warranty
  • Featuring the displacement of a 1.05 in the mounting space of a .90.
  • More displacement means more power, and these engines boost displacement by 15%!
  • A huge venturi boosts output even further.
  • The machined, blue anodized heatsink head is light in weight, and cools the engine efficiently.
  • An extra feature on the 105HZ-R is the pressurized DRS (Demand Regulator System), which ensures consistent fuel flow regardless of the heli's attitude.

Product Specifications

Manufacturer # 18750
Cylinders Single
Product Width 2.4 in (61 mm)
Total Weight 21.5 oz (608 g)
Plug Type #8 glow plug
Stroke 1.02 in (26 mm)
Displacement 1.048 cu in (17.17 cc)
Product Length 3.2in (82.6 mm)
Power Type Glow
Bore 1.14 in (29 mm)
Product Height 3.1 in (79 mm)
RPM Range 2,000 - 16,500 rpm
Crankshaft Threads UNF5/16-24