New OS-105HZ Helicopter Engine

Jan 27, 2012 No Comments by

This is the new OS-105HZ Helicopter Engine, with  DRS (Demand Regulator System), that was designed for precision aerobatic and 3D heli pilots to provide more power for their 90 size helicopters. As you know from my previous blogs, I’m running the OS90HZ in my Raptor 90G4, and it’s doing a great job. But I guess you can never have enough power. And, as I understand it, this engine has been designed to run on 15% nitro for a fuel cost savings. So for those of you who want to perform those huge maneuvers and hardcore, smack down-style 3D, the 105HZ will have the power in abundance. Although the displacement has been increased by 15%, the casing is still small enough to fit in a .90-sized mounting pattern.

Displacement: 1.048 cu in (17.17cc)
Bore: 1.442″ (29mm)
Stroke: 1.024″ (26mm)
Practical RPM: 2,000-16,500
Output: 3.75 hp @ 15,000 RPM
Weight: 21.46 oz (608g)

Paul Tradelius, Uncategorized

About the author

A regular contributor to Model Airplane News, he is also the columnist for our “Rotor Speed” helicopter column. Paul has been flying RC helicopters since the early ‘80s and now enjoys all types of rotary machines, including scale and aerobatics, and he continues to experiment with modifications to improve performance.
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