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O.S. MAX-105HZ-R DRS Heli Engine

Model No.: OS-18750

Price: US$508.00

Availability: This product is currently SOLD OUT
Order quantity:
Out of Stock


O.S. MAX-105HZ-R DRS Heli Engine for 3D Helicopter NEW!

Enjoy huge power and performance with the compact 105HZ and 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 pressurized DRS (Demand Regulator System), which ensures consistent fuel flow regardless of the heli's attitude.


  • 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

With back-to-back FAI world championships in 2005 and 2007, the 91SZ-H was a winner by anyone's standards. Now there's the 91HZ – a 91SZ-H redesigned with the help and advice of the world's top pilots. It offers the tuning ease and performance consistency of the multi-time world champion and design innovations that promote improved cooling, a tighter compression seal – and tuning ease!

Package Include:

  • 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)
  • English Instruction Manual


  • 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)


Code No. 18750, OSMG1961

This product was added to our catalog on Tuesday, 14. February 2012.
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