Ul engines

Discussion in 'The light stuff area' started by ryanjames170, Sep 20, 2018.

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  1. Sep 20, 2018 #1

    ryanjames170

    ryanjames170

    ryanjames170

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    For 4 stroke engines what is all out there?

    I know the 1/2 VW

    What else are people sticking on UL aircraft.
     
  2. Sep 20, 2018 #2

    blane.c

    blane.c

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    1/3 Corvair?
     
  3. Sep 20, 2018 #3

    rotax618

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    What about a direct drive Suzuki G10, hand proped, battery ignition, Bing carb, auto flexplate. Probably lighter than 1/2 VW, no complex building or counterweights.
     
  4. Sep 20, 2018 #4

    blane.c

    blane.c

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    That's interesting.
     
  5. Sep 20, 2018 #5

    rotax618

    rotax618

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    The G10 engine can be leaned over up to 80deg towards the exhaust side to raise the thrust line in tractor situations. A small turbo can be fitted to increase the low end torque, a muffler is not required when a turbo is fitted so there would be no net weight gain.
     
  6. Sep 21, 2018 #6

    BBerson

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    I think Jeron had one on the test stand. With radiator and coolant not light enough for an ultralight, as I recall.
    The Generac 993 is lighter by far.
     
    Last edited: Sep 21, 2018
  7. Sep 21, 2018 #7

    Dana

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    Valley engineering big twin.
     
  8. Sep 21, 2018 #8

    ryanjames170

    ryanjames170

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    Curious, but has antone tried a Briggs V twin direct drive?
     
  9. Sep 21, 2018 #9

    billyvray

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    [video=youtube_share;yWLhMyiN6Sw]https://youtu.be/yWLhMyiN6Sw[/video]
     
  10. Sep 21, 2018 #10

    pwood66889

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    20160319_eng419.jpg


    2A-042 = 42 cu. inch, 688 cc's. Note standard paint stur stick for sizing.
    Percy in NW FL, USA
     
  11. Sep 21, 2018 #11

    TFF

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    Many planes are designed around the engine, so if you want to use something else, it might cut into the design if you don't think it out. Not as plug and play for numerous reasons. A good ole Rotax s hard to beat if in good shape but the 1/2 VW would be my pick.
     
  12. Sep 21, 2018 #12

    ryanjames170

    ryanjames170

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    Looks to be only 10hp though
     
  13. Sep 21, 2018 #13

    lr27

    lr27

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    There are 4 stroke paramotor engines which are pretty light.

    What sort of ultralight are we talking about? I'm assuming a part 103 legal ultralight. Even then, ultralights with long wings, clean lines and light pilots will need less power than others. I'm thinking one of the latter might possibly be flown with a vertical shaft, 500 cc Briggs that's got a weird redrive or has been converted to horizontal. But, of course, that's a project.

    This is already done, but it's a bit on the large side, IMHO:
    http://www.soloflightltd.com/SOLO ENGINE..html

    This is sort of interesting:
    http://www.renntechkarting.com/products_xf40.html

    Verner Motor has 3 cylinder radials that don't need redrives, though they're a bit heavy.

    This one's interesting too:
    http://www.vernermotor.com/old/index474c.html?sec=41
    However, I think it's out of production.

    You might try poking around for airboat or hovercraft engine conversions.
     
  14. Sep 21, 2018 #14

    ryanjames170

    ryanjames170

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    I do have a opposed twin Briggs kicking around think 16-18hp I know those respond well to mods to pup up the hp.. as there very choked off
     
  15. Sep 21, 2018 #15

    pictsidhe

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    Cooling isn't great on those. From the old run it rich and save on fins school of design.
     
  16. Sep 21, 2018 #16

    ryanjames170

    ryanjames170

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    That I don't know bUT could always up the oil cooling end of it. Have to ground test it to see.
     
  17. Sep 21, 2018 #17

    rotax618

    rotax618

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    The definition of an Ultralight is different in different countries, if you strip the Suzuki down to the bare engine, add a side draft 32mm Bing and a simple 3 into one exhaust the actual weight is about the same as a 582 Rotax, in direct drive configuration it would be only about 40ish HP but would be easily light enough for our Ultralight Category in OZ.
     
  18. Sep 21, 2018 #18

    dougwanderson

    dougwanderson

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    the solo 35 and 40 seem a bit optimistic on there numbers.?.?
    snowmobile 4 strokes.

    Kevin Armstrong [video]https://m.youtube.com/watch?v=8WG990wAD0A[/video]
     

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