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

Nice thing about it for the heli modelers: the favorite and effective .91 ringed engine now is a rear-exhaust design!

Pilots of Hirobo along with other scale services and products will appreciate the way the 91RZ-H power plant will fit in the canopy to protect the heli's scale lines.

Like side-exhaust 91SZ-H, the 91RZ-H features new usage porting, groundbreaking carbohydrate and a redesigned crankcase offering you better provide crank and thrust bearings.

Available with two heat sink heads: a more impressive, blue anodized head to have significantly more efficient air-con or an even more lightweight, squared die-cast mind (DH).

REQUIREMENTS

• Stock 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
• bodyweight w/o muffler: 21.3 oz (605 g)
• Includes: #8 radiance plug