O.S #18510 – OS 91RZ-H DH Ring Engine W/60M-C Carb.

This is the O.S. Max .91 RZ-H DH Rear Exhaust Helicopter Engine. Brand New
in Box

Features:

• Diecast cylinder head
• Designed for Hirobo and other scale helicopters where engine must fit inside
  canopy to preserve heli’s scale lines
• Ringed piston
• 60M-C 3-needle carburetor with mid-range needle for precise adjustments

Includes:

• O.S. Max .91 RZ-H DH Rear Exhaust Helicopter Engine with #8 glow plug, instruction
  manual

Specs:

• Displacement: 0.912 cu in (14.95 cc)
• Bore: 1.091″ (27.7mm)
• Stroke: 0.976″ (24.8mm)
• Practical RPM: 2000-16,000
• Power Output: 3.3 ps @ 15,000 RPM
• Weight: 22.0oz (623g)
• Crankshaft Size: 5/16-24
• Distance Between Mounting Holes Same Side: 0.98″ (25mm)
• Distance Between Mounting Holes Opposite Side: 2″ (52mm)
• Distance From Back Plate to Front Bearing: 3.3″ (83.8mm)
• Distance From Back Plate to Crankcase Center: 1.1″ (27.4mm)
• Distance From Crankcase Center to Front Bearing: 2.2″ (56.4mm)
• Distance From Crankcase Center to End of Crankshaft: 3.5″ (88.7mm)
• Width at Mounting Tabs: 2.4″ (61mm)
• Width of Crankcase Below Mounting Tabs: 1.7″ (42.6mm)
• Distance from Throttle Lever to Center of Crankcase: 1.7″ (42.5mm)
• Distance/Bottom of Mounting Tab/Top of Cylinder Head: 3.2″ (81.2mm)