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O.S. Engine 105HZ-R DRS Heli Engine OS-18750

Your Price: $529.99
Retail Price:$799.99
Your Savings:$270.00(34%)
Out of Stock
Part Number:18750

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105HZ-R Heli Engine

Enjoy huge power and performance with the compact 105HZ-R!

These are the engines that precision aerobatic and 3D heli pilots have been waiting for! In order for 90-sized machines to nail huge maneuvers and hardcore, smackdown-style 3D it's all about power, and both the 105HZ and 105HZ-R have it in abundance. Displacement has been increased by 15%, while a huge venturi rams air into the carburetor, producing massive power. Plus, they fit in a .90-sized mounting pattern.

  • 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 DRS (Demand Regulator System), which ensures consistent fuel flow regardless of the heli's attitude.
O.S. 2-year Limited Warranty 

  • Specifications
  • Exploded Views
  • Parts Listing
  • Accessories
Stock Number: OSMG1961
Displacement: 1.048 cu in (17.17 cc)
Bore: 1.442 in (29 mm)
Stroke: 1.024 in (26 mm)
Practical rpm: 2,000-16,500
Output: 3.75 hp @ 15,000 rpm
Weight: 21.03 oz (596 g)


     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
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     
          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)

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