Reviews for O.S. Max .91 HZ-R 3D Speed Competition 3D Helicopter Engine w/61G Carburetor (Black) [OSM18642]

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Allen Berchenko
Wednesday, Aug 10 2011 (about 4 years ago)
O.S. Max .91 HZ-R 3D Speed Competition 3D Helicopter Engine w/61G Carburetor (Black)
I have this motor with the Powerboost Pipe combo. All I can say in one word to describe this motor: FANTASTIC! Currently installed in my T700N LE FBL, Im running 14deg pitch, and 10deg cyclic! With my old motor (ys 91 3ds) I could only run about 13deg MAX. The recovery and torque this motor has is outstanding. I can do sustained elevator tic-toc's, and aileron tic-toc's effortlessly. Running 30% Byron Rotor Rage with .002 shim. A couple notes to get max performance from this motor: -Run an OS#8 or an Enya #3 -Use BOTH shims included with the motor if you're going to run 30%. It allows the needles to be not so sensitive, without any adverse effect on power! -Make sure your plumbing is absolutely air tight. Sealed. ANY leaks and you could be chasing needles non-stop! -My needle settings at 85deg F. 40% humidity: Low- Stock position. Mid- 3/4 turn out. High-1-3/4 turn out. <---only for reference!