O.S. Engine 91RZ-H DH Rear Exhaust Ringed Heli Engine  [OSMG1979]

Great news for your heli modelers: the popular and powerful .91 ringed motor now will come in a rear-exhaust design!

Pilots of Hirobo and other scale devices will appreciate the way the 91RZ-H energy plant will fit inside the canopy to preserve the heli's scale lines.

Like side-exhaust 91SZ-H, the 91RZ-H features new consumption porting, new carb and a redesigned crankcase that provides better support the crank and thrust bearings.

Available with two temperature sink heads: a bigger, blue anodized head to get more efficient air conditioning or an even more lightweight, squared die-cast mind (DH).

REQUIREMENTS

• Inventory Numbers: OSMG1979 91RZ-H DH
• Displacement: 0.91 cu in (15 cc)
• Bore: 1.09 in (27.7 mm)
• Stroke: 0.98 in (24.8 mm)
• Practical rpm: 2,000-16,000
• Production: 3.3 hp @ 15,000 rpm
• Body weight w/o muffler: 21.3 oz (605 g)
• Includes: #8 radiance plug