O.S. 91RZ-H engines

O.S.® 91RZ-H Rear Exhaust Ringed Heli Engines

Features

Terrific news — O.S.' popular and powerful 91 ringed engine now comes in a rear-exhaust design!

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.

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.

Available with two heat sink heads: a larger, blue anodized head for more efficient cooling or a more compact, squared die-cast head (DH).

91-sized power designed for scale helis!

Specifications

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

Practical rpm range: 2000-16,000
Weight w/o muffler: 21.3 oz (605 g)
Includes: #8 glow plug

91RZ-H Ringed

LXNHH2 ONLY

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91RZ-H DH

LXNHH1 ONLY

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Prices shown were current at time of ad production and are subject to change.