Interesting new development

Discussion in 'Half VW' started by ultralights, Sep 10, 2018.

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  1. Sep 10, 2018 #1

    ultralights

    ultralights

    ultralights

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    Steve Howard of Lone Star Light Sport (Texas), are development a half VW case with
    Harley cylinders head. http://www.vwaircraftengineconversions.com
    The Javelina is a twin cylinder aircraft engine conversion based on the 1/2 VW. Using American motorcycle heads and cylinders Lone Star light sport aircraft has been able to increase the airflow over the heads and cylinders by over 30%, and the cooling area by over 130%.
    This allows the use of 9 1/2 to 1 compression ratio pistons, which produces 75 hp and comes in at 126 pounds, 30 pounds lighter than a Rotax 912 80 hp engine, and about the same weight as a Rotax 582 with drive, electric start and cooling system.
    We currently have 2 prototype engines.
    The first is a cut aluminum case using twin cam style cylinders. 101/82mm bore and stroke. 1320cc 80 cubes.
    Weight on this engine is 122 lbs.
    The second engine features a full magnesium case 89/82mm bore and stroke. 64 cubes 1050cc.
    Total weight is 106 lbs less starter.
    We will be monitoring the temps closely. CHT and EGT are expected to be lower than a 7.5 : 1 half VW thanks to 100% more cooling fin surface area on the cylinders!.
    This setup will allow for compression in the 9.5 : 1 range in the future. Hoping to achieve 60 hp at 9.5:1.
    With the bore to stroke ratio of this engine torque numbers should exceed the HP numbers in the 32-3400 RPM band.

    [​IMG]
     
    FritzW likes this.
  2. Sep 30, 2018 #2

    sotaro

    sotaro

    sotaro

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    Keep us posted. I have thought of the harley cylinders and heads on the O-100 Pegasus case and crank as well. I am sure this is much cheaper. Is that a custom crankshaft?
     
  3. Sep 30, 2018 #3

    pictsidhe

    pictsidhe

    pictsidhe

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  4. Sep 30, 2018 #4

    TFF

    TFF

    TFF

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    Instead of horsepower, tell us the props and RPMs it can turn.
     
  5. Sep 30, 2018 #5

    lakeracer69

    lakeracer69

    lakeracer69

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    There is a thread already in progress here at HBA. Look under flythered. That's not a misspelling.
     

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