91HZ-R 3D Speed Competition Heli Engine
Designed for aggressive 3D!
Following the popularity of the 91HZ-R with On-Demand Regulator, O.S. has now taken high-performance, high-speed helicopter engines to the next stage of evolution. Introducing the 91HZ-R Speed Engines - based on the 91HZ-R, factory-tuned at the O.S./Japan facilities and guaranteed to blow you away! The 3C version is designed expressly for F3C competition with its controlled, precise maneuvers in mind. For pilots who prefer aggressive, stick-bashing 3D flight competition, O.S. offers this 3D version.
Features include:
- Lightweight, machined heatsink head
- Big-bore carburetors best-suited for the intended use (F3C or 3D)
- Best precision advanced exhaust cylinder timing (for F3C or 3D)
- Newly designed combustion chambers, shaped to match the big bore carburetors and advanced exhaust cylinder timing
- Lightweight, forged steel crankshaft counter weight to lower vibration for higher speeds
- Improved backplate shape, to accommodate Futaba's BPS-1 RPM Sensor and increase primary pressure for greater stability
91HZ-R 3D Speed Black
Pilots who slam the sticks will be very impressed with the 3D version. This engine develops all the high performance required for stable horsepower at any attitude. The big bore carburetor is specially designed to develop stable horsepower at 70~80% throttle which is widely used in 3D flight. The matched cylinder exhaust timing has been advanced to 165 degrees.
91HZ-R 3D Speed Black with PowerBoost Pipe
For pilots eager to get every advantage, you have the option of the 3D version with the included PowerBoost pipe from O.S. - designed specifically for the 91HZ-R Speed 3D Version.
- Specifications
- Exploded Views
- Parts Listing
- Accessories
- Gallery
OSMG1981
OSMG1982 w/Pipe
Displacement: 0.91 cu in (14.9 cc)
Bore: 1.09 in (27.7 mm)
Stroke: 0.98 in (24.8 mm)
Practical rpm: 2,000-16,500
Output: 3.55 hp @ 15,500 rpm
Weight w/o muffler: 21.3 oz (603 g)
Weight w/pipe (OSMG1982): 29.1 oz (826 g)
Primary Accessories
| Stock Number | Mfr Number | Product Description | Quantity Needed |
| GPMQ4131 | GPMQ4131 | Great Planes Silicone Fuel Tubing Standard 3' | 1 |
| GPMQ4150 | GPMQ4150 | Great Planes Ultra Precision Fuel Filter | 1 |
| HCAP2550 | HCAP2550 | Hobbico 4-Way Wrench w/Plug Storage | 1 |
Field Equipment
| Stock Number | Mfr Number | Product Description | Quantity Needed |
| DTXP0300 | DTXP0300 | Duratrax Glow Starter C Battery | 1 |
| FUGP4202 | 4200BP2 | Fuji Batteries C Alkaline Battery (2) | 1 |
| HCAP3015 | HCAP3015 | Hobbico Hand-Crank Fuel Pump | 1 |
Optional Accessories
| Stock Number | Mfr Number | Product Description | Quantity Needed |
| HCAP3001 | HCAP3001 | Hobbico After Run Engine Oil 2 Fl Oz | 1 |
| HCAP3105 | HCAP3105 | Hobbico Top Fueler MkIII | 1 |
| HCAP3107 | HCAP3107 | Hobbico Top Fueler MkIII Panel Ready | 1 |
| OSMG5872 | 72403050 | O.S. Super Can Filter Large | 1 |
| OSMR2976 | 71521000 | O.S. Long Socket Wrench With Plug Grip | 1 |
