Features
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- Terrific news — O.S.' popular and powerful 91 ringed engine now comes in a rear-exhaust design!
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- Pilots of Hirobo and other scale machines will appreciate how the 91RZ-H power plant will fit inside the canopy to preserve the heli's scale lines.
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- Like the side-exhaust 91SZ-H, the 91RZ-H features new intake porting, new carb and a redesigned crankcase that offers better support for the crank and thrust bearings.
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- Available with two heat sink heads: a larger, blue anodized head for more efficient cooling or a more compact, squared die-cast head (DH).
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91-sized power designed for scale helis!
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Buy a new O.S. Engine between August 3rd and December, 31st 2009 and exchange the engine you're replacing for a valuable O.S. Engines merchandise certificate.
Click Here For More Information
And To Download Your Rebate Form.
To take advantage of this Manufacturer's Mail-In Rebate Offer you must download and print the Rebate Form above. (file size 208K) Downloads Require Adobe Acrobat Reader 3.0 or higher.
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Specifications
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Displacement: 0.91 cu in (15 cc)
Bore: 1.02 in (25.8 mm)
Stroke: 0.87 in (22.0 mm)
Output: 3.3 ps @ 15,000 rpm
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Practical rpm range: 2000-16,000
Weight w/o muffler: 21.3 oz (605 g)
Includes: #8 glow plug
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