Speed Tuned 91HZ-Rs
The first speed-tuned aircraft engines from O.S.
O.S. introduces the Speed Tuned 91HZ-R 3C and 91HZ-R 3D, exceptional heli engines for F3C and 3D competition. Both share many great features, not the least of which is the "On Demand" Regulator System, which delivers fuel consistently to the carb regardless of the heli's attitude or the pilot's flying style!
- Featuring designed combustion chambers, shaped to match the big bore carburetors and advanced exhaust cylinder timing.
- Lightweight, machined heatsink heads.
- Crankshaft counter weight has been modified to reduce vibration at high rpm.
- Anodized crankcases offer better heat dissipation.
- "On Demand" Regulator System guarantees a steady fuel supply to the carb at any attitude, on a full or empty tank and during the most abrupt throttle changes.
Specifications
Displacement: 0.91 in3 (14.9 cc), Output: 3.6 hp @ 15,500 RPM, RPM Range: 2,000-16,500, Weight (w/o Muffler): 21.2 oz (603 g), Requirements: 10-30% nitromethane fuel with 18% (min.) lubricant content. Lubricants may be either castor, synthetic or castor/synthetic blend, Field equipment, Muffler (depending on heli)
Features
Click Images for larger view.
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91HZ-R 3C Speed: A carburetor intake bore maximized to 11.2 mm and cylinder exhaust timing advanced to 170° combine to produce extreme horsepower for faster flight speeds and more stable hovering.
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91HZ-R 3D Speed: With the carburetor inlet enlarged to 11.2 mm and exhaust port timing set at 160°, the 91HZ-R 3D offers incredibly stable mid-torque power for awesome 3D flight.
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91HZ-R 3D Speed w/PowerBoost Pipe: All the features of the 91HZ-R 3D, plus a PowerBoost pipe for precision performance from high RPM maneuvering to idling and hovering.
91HZ-R 3C Speed Red |
stock#
LXAZGJ
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Only
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Tech Notes Accessories Needed | ||
91HZ-R 3D Speed Black |
stock#
LXAZGH
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Only
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Tech Notes Accessories Needed | ||
91HZ-R 3D Speed Black w/Powerboost Pipe |
stock#
LXAZRV
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Only
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Tech Notes Accessories Needed | ||
Tower Hobbies Has Been Serving Hobbyists Since 1971 • Call 800-637-6050 or 217-398-3636
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