O.S. 105HZ and 150HZ-R enginesHeli pilots who demand huge power and performance for their helicopters can rest easy. Everything they’ve been waiting for is now available with the O.S. 105HZ and 150HZ-R engines! For 90-sized machines to nail huge aerobatic or 3D maneuvers, it’s all about power. Both of these engines deliver. Displacement has been increased by 15% – and they still fit in a .90-sized mounting pattern, retaining famous O.S. quality.

  • Both feature 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%!
  • The machined, blue anodized heatsink head is lightweight and provides efficient cooling.
  • 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.
  • Velocity Stack to increase airflow and enhance engine performance.
  • Ideal bore/stroke ratio to minimize vibration; no need for gear ratio changes.
  • Backplate accepts the Futaba BPS-1 RPM Sensor for the GY701 and CGY750
  • PowerBoost pipe engineered to be the perfect partner for the 105HZ and is sold separately
  • On 15% nitro, the 105′s run as strong or stronger than 91′s using 30% nitro

SPECIFICATIONS
Displacement: 1.048 cu in (17.17 cc)
Bore: 1.142 in (29 mm)
Stroke: 1.024 in (26 mm)
Suggested RPM range: 2,000 – 16,500
Output: 3.7 ps @ 15,000 rpm
105HZ Weight: 21.03 oz (596 g)
105HZ-R Weight: 21.46 oz (608 g)

                                         Retail
OSMG1960 105HZ Heli Engine              $699.99
OSMG1961 105HZ-R Heli Engine with DRS    799.99
OSMG2884 PowerBoost Pipe 105HZ           319.99

Visit the O.S. Engines website at www.osengines.com

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