Nelson H-44
| Nelson H-44 | |
|---|---|
| Type | Two-stroke aircraft engine |
| National origin | United States |
| Manufacturer | Nelson Engine Company |
| Designed by | Ted Nelson |
| Major applications | Bowlus/Nelson Dragonfly |
| Produced | circa 1947 |
|
| |
The Nelson H-44 is an American single ignition, four-cylinder, horizontally opposed, direct drive, two-stroke aircraft engine that was developed by the Nelson Engine Company for use in motorgliders.[1]
Design and development
The H-44 was designed in the period following the Second World War and a specially designed motor glider was created by Hawley Bowlus to utilize the engine, the Bowlus/Nelson Dragonfly.[1]
The engine was not certified. Under the CAR 5 regulations then in place in the USA for gliders, a certified auxiliary power glider could be flown with a non-certified engine and propeller. The engine is instead described on the Dragonfly type certificate.[1]
The four-cylinder engine runs on a 12:1 mixture of 80 octane gasoline and SAE 30 oil. It is equipped with a single Carter WA1 carburetor and a recoil starter.[1]
Operational history
Employed in the Dragonfly the H-44 proved underpowered, which led to the design of the H-49 version. The engine family was not a success and few were produced.[2][3]
Variants
- H-44
- Original design with a 2.25 in (57 mm) bore and 2.75 in (70 mm) stroke, producing 25 hp (19 kW) at 3900 rpm.[1]
- H-49
- Upgraded design with E-225 cylinders giving a 2.375 in (60 mm) bore and 2.75 in (70 mm) stroke, producing 28 hp (21 kW) at 4000 rpm.[1]
Applications
Specifications (H-44)
Data from FAA Type Certificate Data Sheet[1]
General characteristics
- Type: Four-cylinder, two-stroke, single-ignition aircraft engine
- Bore: 2.25 in (57 mm)
- Stroke: 2.75 in (70 mm)
- Displacement: 44 cubic inches
- Dry weight: 40 lb (18 kg)
- Designer: Ted Nelson
Components
- Fuel system: Carter WA1 carburetor
- Fuel type: 80 octane gasoline
- Oil system: premixed oil in fuel, SAE 30 oil mixed at 12:1 fuel to oil
- Cooling system: air
- Reduction gear: none
Performance
- Power output: 25 hp (19 kW) at 3900 rpm
- Compression ratio: 9:1
See also
References
- 1 2 3 4 5 6 7 Federal Aviation Administration (April 1947). "Aircraft Type Certificate Data Sheet GTC19" (PDF). Retrieved 10 March 2011.
- 1 2 Activate Media (2006). "Dragonfly Bowlus Nelson". Retrieved 10 March 2011.
- 1 2 Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 118. Soaring Society of America, November 1983. USPS 499-920