Rotax options...are there any ?

Discussion in '2-Stroke Aircaft Engines' started by MadProfessor8138, Nov 1, 2019.

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  1. Nov 3, 2019 #21

    BBerson

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  2. Nov 4, 2019 #22

    proppastie

    proppastie

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    this link works
    https://www.homebuiltairplanes.com/forums/threads/direct-drive.2075/#post17523

    edit see post above.....duplicate sorry
     
  3. Nov 4, 2019 #23

    cgifly2

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    I had this problem answered 10 years ago. Direct drive, 72hp 85lbs 1000$. 4.5gph
    McCullough 4130. 2 stroke 4 cylinder.
     
  4. Nov 4, 2019 #24

    n3puppy

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    Or the Kiekhaefer O-45-35 Twin cylinder version
    35hp - 35lbs - 4250 Rpm 8DDA8795-EA2B-4DF2-98DC-4AEBDEBD3CAC.jpeg
     
  5. Nov 4, 2019 #25

    proppastie

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    What size prop....can one make it work with a 31" prop (wide blades ? to keep rpm down)
     
  6. Nov 4, 2019 #26

    MadProfessor8138

    MadProfessor8138

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    Did you mean the McCullough 4318 72hp engine ?
    Those engines should be around the $300-$500 range with prop flange.

    I'm not an expert with the McCullough engines but I know they had a tendency to lock a cylinder up all the time.
    Those engines were meant to be disposable.
    Watched several guys over the years struggle with them.
    But,I've also heard of guys having good luck with them on gyro's......

    Kevin
     
  7. Nov 4, 2019 #27

    Vigilant1

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    Maybe 72 HP. Maybe 4.5gph. Not at the same time, though.
     
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  8. Nov 5, 2019 #28

    cgifly2

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    Yup 72hp 4.5 gph you have Togo through a 500$ one to make it reliable. Electronic ignition and new bearings. That’s what makes it 1k. I wrote an article on it in sport pilot, April 2006. And I have a comprehensive webpage that explains the lows and highs, does and don’ts . I am maybe not an expert on them, but if you were talking to an expert I would not be standing far away.
     
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  9. Nov 5, 2019 #29

    MadProfessor8138

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    cgifly2......please post the link to your webpage that has the information on these engines.

    Kevin
     
  10. Nov 5, 2019 #30

    cgifly2

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    Ok so here is the link. its from a real old extinct web page that I created. I didnt know what I was doing but the info is there.
    http://www.geocities.ws/cgifly2/
     
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  11. Nov 5, 2019 #31

    proppastie

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    An almost expert would be heads above someone that never played with one....I am interested in the 2 cylinder one post #24 ....you said the 4 cylinder ones are still being sold on your web page...do you know about the 2 cylinder ones?
     
  12. Nov 5, 2019 #32

    cgifly2

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    Sorry no experience with the 2 cylinder. The 4 cylinder engines are far more common, because of the use by gyro guys.
     
  13. Nov 5, 2019 #33

    n3puppy

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    The two cylinder drone engines are nowhere near as common as the 4 cyl McCulloch.

    There are two versions of two cylinder both weighing about 35lbs
    O-45-1 = 20hp@ 3650,rpm or 22hp@4000 Rpm depending on prop
    AND
    O-45-35= 35hp@ 4250Rpm.

    The O-45-1 is by far the more common of the two as it was a "spec" engine manufactured by three suppliers Righter, Menasco, and Kiekhaefer. They supplied the drone makers with interchangeable engines.

    When the government started looking for more powerful, faster target drones Kiekhaefer responded with the O-45-35 engine. Same displacement but bigger carb, better porting and higher compression were added to the engine to get the increase in HP & RPM

    Not many were built because the 4cyl McCulloch was way more powerful and gave the government what it really wanted for bigger, faster targets. Plus the twin cylinder was now putting out almost twice as much power (20 vs 35) and started to get a bad reputation for reliability.

    Kind of funny when you consider they were meant to be shot out of the sky anyway .....

    I have 2 of the 20/22hp ones. Like the McCulloch - I would be looking at bearing, ignition and Carb improvements before trusting it to carry humans
    There is 1 confirmed human flight behind a 35HP twin. The WEE BEE in the late 1940's
    https://www.historynet.com/the-wee-bee.htm
     
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  14. Dec 5, 2019 #34

    Armilite

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    Rotax 377/380 or 440/447UL Rotax Engine Crankshaft & Engine Crankcase Assembly on Ebay, looks like it's Drilled & Tapped already for Gear Box. $395. I bought a set of 440/447 Cylinders and Single Plug Heads for $80 a month ago. Could make someone a nice engine. I see B Gear Box for $500 also.

    eBay item number:
    123398266691
    ROTAX 380 PRO8 Tapped.jpg
     
  15. Dec 6, 2019 #35

    proppastie

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    is that a crack at 1:00 (10 degree RH from vertical)?
     
  16. Dec 6, 2019 #36

    dino

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    looks like casting flash
     
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  17. Dec 7, 2019 #37

    Armilite

    Armilite

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    It looks like Sealant to me. Notice Left Side has Gray Sealant on it.
     
  18. Dec 7, 2019 #38

    proppastie

    proppastie

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    maybe the gear box was cracked
     
  19. Dec 10, 2019 #39

    Armilite

    Armilite

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    Some of these ATV Single Cylinder Engines look promising. Especially if they have Nikasil Cylinders. Looks like it will take a Big Carb. This is a Polaris 250 Free Air Single. Didn't find a good photo of the Case. 1985-1995 NEW POLARIS OEM 250 Cylinder Head Trail Boss - 2.jpg 1985-1995 NEW POLARIS OEM 250 Cylinder Head Trail Boss - 1.jpg 87 Polaris Cyclone 250 Engine 73.43mm Cylinder JUG Head - 4.jpg 87 Polaris Cyclone 250 Engine 73.43mm Cylinder JUG Head - 8.jpg
     

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