OS 91HZ-R 3D Engine with Powerboost Pipe

Jan 13, 2012 No Comments by

My review of the Raptor 90 G4 is going to need a powerful and reliable engine to perform at its best, and what could be better than the OS 91HZ-R 3D with Powerboost Pipe. This basic engine is actually available in several different forms. First as mentioned here with a black head designed for 3D flying, and as an F3C version with a red head, and finally as a combination engine and powerboost pipe.

This engine is designed to be used with 10-30% nitro, with the Demand Regulator System supplying a constant supply of fuel throughout the most demanding maneuvers. OS has a long history of both power and reliability, which is exactly the combination we need with our helicopters. And how about that pipe??? Is that a thing of beauty or what???? I can just see myself polishing it every time I fly.

This OS 91, and their complete line of engines, can be viewed with more technical information at the TowerHobbies web site http://www3.towerhobbies.com/cgi-bin/wti0091p?&P=SM&C=GCR&V=OSM





Paul Tradelius, Tower Hobbies

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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