• Source: Nelson H-44

      • 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.


      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.
      The engine was not certified. Under the CAR 5 regulations then in place in the US 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.
      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.


      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.


      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.
      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.


      Applications


      Bowlus/Nelson Dragonfly


      Specifications (H-44)


      Data from FAA Type Certificate Data Sheet


      = 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


      List of aircraft engines


      References

    Kata Kunci Pencarian: