91HZ Ringed Heli Engine
Championship-caliber performance for precision aerobatics!
The 91HZ Ringed delivers the high-end power and hovering stability required to execute competition-level heli maneuvers. Now features a 61-E carburetor for improved performance!
- Ideal for aerobatic competition.
- Rectangular heat sink allows engine to be enclosed entirely inside a cooling shroud.
- 61-E carburetor features a thermal insulator to absorb heat. A needle valve control lever allows you to control the mixture from your transmitter.
- Piston and ball bearing-supported crankshaft are designed for reduced vibration improved torque stability across the entire RPM range.
- Heat sink-type backplate.
Five holes in the top of the lightweight piston route gases to the piston ring from within, resulting in a tighter seal and minimum blow-by.
A heat sink machined into the end of the crankcase increases cooling and improves performance.
- Specifications
- Parts Listing
- Accessories
Stock Number: OSMG1974
Displacement: 0.91 cu in (14.95 cc)
Bore: 1.09 in (27.7 mm)
Stroke: 0.98 in (24.8 mm)
Practical rpm: 2,000-16,000
Output: 3.35 hp @ 15,000 rpm
Weight w/o muffler: 1.36 lb (618 g)
Displacement: 0.91 cu in (14.95 cc)
Bore: 1.09 in (27.7 mm)
Stroke: 0.98 in (24.8 mm)
Practical rpm: 2,000-16,000
Output: 3.35 hp @ 15,000 rpm
Weight w/o muffler: 1.36 lb (618 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 |
