**NEW** O.S. Engines .91 SZ-H PH-Hyper Ringed Heli Engine w/Pump - RC Groups
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May 30, 2006, 11:49 AM
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**NEW** O.S. Engines .91 SZ-H PH-Hyper Ringed Heli Engine w/Pump

**NEW** O.S. Engines .91 SZ-H PH-Hyper Ringed Heli Engine w/Pump

“Hyping” performance — and heli’s!

• O.S. has enhanced the World Championship-winning performance of the .91 SZ-H Ringed heli engine by equipping the PH-Hyper version with a pump.
• The pump delivers consistent fuel pressure, regardless of the heli’s attitude.
• Pilots will still enjoy all of the .91 SZ-H’s original features — including new intake porting, a new carb and a redesigned crankcase that offers better support for the clutch and rotor.

• Displacement: 0.91 cu in (15cc) • Bore: 1.02 in (25.8mm) • Stroke: 0.87 in (22.0mm) • Output: 3.3 ps @ 15,000 rpm • Practical rpm range: 2000-16,000 • Weight w/o muffler: 21.3 oz (605g) • Includes: fuel pump, #8 glow plug

Retail Street
OSMG1984 .91 SZ-H PH-Hyper Ringed Heli Engine w/Pump $649.99 $419.99
OSMG1983 .91 SZ-H Ringed Heli Engine $549.99 $349.99


For more information please visit www.osengines.com
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Aug 08, 2017, 12:22 PM
Fly for Fun
I need some good advise on an OS 55HZ hyper ringed engine I am putting this engine in a TSA 600N and the 6mmhex starter clutch free wheels in a CW direction. The OS instructions shows CW rotation specifically in a pic abut rotation. But the only way to attempt to start the engine is run starter CCW but The OS instructions are for CW only, and flipping the oneway/clutch upside down does not seem right and if it is installed that way I have to add washers between owb/ clutch and that is not correct per install instructions and it will result in Blades running CCW which means tail torer should be on other side and ALL pics and diagrams show blades should be in a CW orientation. I have read that running some engines in reverse can damage engine. and when I turn engine by hand CCW the compression is NOT as good as CW.

I need some good advise here ....... cn an OS engine I specified above CCW looking at shaft end.......?

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