2 stroke alternative ?

Discussion in '2-Stroke Aircaft Engines' started by MadProfessor8138, Jun 6, 2019.

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  1. Jul 3, 2019 #101

    pictsidhe

    pictsidhe

    pictsidhe

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    I had a go on a can-am in the late 80's. Magical levitating front wheel. Just like the Japanese competition.
    They were doing some cicuit racing with tandem twins and not getting humiliated.
     
  2. Jul 3, 2019 #102

    MadProfessor8138

    MadProfessor8138

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    I rode a Can-Am ASE enduro bike back around 1985 when they had just come out.....
    It was rough around the edges compared to the Japanese offerings......but it was a brute when you would twist the wick....raw,unrefined power.

    D*mn.....I miss the 80's .....good times,good times.

    Kevin
     
  3. Jul 8, 2019 #103

    Sockmonkey

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    Huh, apparently the PattOP engine really does run well.
     
  4. Jul 10, 2019 #104

    mcrae0104

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    I hear it has head-snapping torque.
     
  5. Jul 10, 2019 #105

    MadProfessor8138

    MadProfessor8138

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    Geeze.....what rpm was that thing running ????

    Kevin
     
  6. Jul 11, 2019 #106

    mcrae0104

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    Breakneck speed, I'd say. Google pattakos flyer for more information.

    image.png
     
  7. Jul 11, 2019 #107

    pictsidhe

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    It does indeed run for a few seconds with no load on the bench. Maybe it can run longer and with a load, too!
     
  8. Jul 13, 2019 #108

    Sockmonkey

    Sockmonkey

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    A six cylinder radial scuderi engine might not suck.
    Need valves on the power cylinders but the cams can be on the crank.
    Power wouldn't be any better than a 4 stroke radial with the same number of cylinders, but it's a lot fewer parts. Plus you gotta love the lightness of a single-throw crank.
     
  9. Nov 8, 2019 #109

    jbiplane

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    I made new experimental 2-stroke. Use most of the stock parts + some addons. Power of 2cylinder inline increased from 50 to 64hp. After some design alternation and numerous tests going to make 2-stroke stars use the same approach.[​IMG]
     
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  10. Nov 8, 2019 #110

    proppastie

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    say you wanted 20 hp glider launch only (5-10 min climb) .... 2 stroke, 31" 6000 rpm prop (no re-drive) were considering a bike engine with the transmission cut off....light as possible.....would the crank bearings handle the prop loads... and what bike engine would you recommend.....the Rotax 277 is north of 30 lbs...the model engines are under 15 lb.
     
  11. Nov 8, 2019 #111

    mm4440

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    Hi, what kind of crank/rod setup are you using? oil system?
     
  12. Nov 10, 2019 #112

    jbiplane

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    It stock engine 72mm bore 61mm stroke with some parts instead of standard pistons:
    - steel pushers connected to conrod
    - aluminum spacer
    - brass liners

    Oil system is simple we have separate nozzles for fuel and oil to simplify end user life.

    It is prototype. Know how make much better, but it is initiative project made for "pocket money"
     
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  13. Nov 16, 2019 at 1:33 AM #113

    Bille Floyd

    Bille Floyd

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    Would a longer stroke , lower the rpm ; 3K in the max
    power range, would be Awesome !

    Bille
     

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