Elmer’s No.5 geared engine with the wrong gears.

Discussion in 'Finished Projects' started by bmac2, Jul 21, 2018.

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  1. Jul 21, 2018 #1

    bmac2

    bmac2

    bmac2

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    I’ve always liked Elmer’s No.5 geared engine because it’s such a weird design but the ring gear is just too expensive for me to justify to myself. Playing around with the geometry it looked like it should be doable with almost any ring gear so long as you adjust the gear arm length to keep it on the center line and have a 2 to 1 ratio with the pinion gear.

    0020_My Gears.jpg

    https://www.homemodelenginemachinist.com/threads/elmer’s-5-geared-engine-maybe.30206/

    For this engine I used a gear out of a dead Ryobi cordless drill and made the pinion gear. Most of the build is straight off the original drawings with only the drive end reworked to work with the gears I had. I’m afraid I went for looks over function with the flywheel and the engine would probably be able to run a little slower with something heavier.
    IMG_2732.JPG
    IMG_2733.JPG
    IMG_2734.JPG
    So if anyone has wanted to try this engine but was being held back by the cost of the gear just get a dead drill and go for it. In the worst case you can reuse most of the parts and make any of Elmer Verburg other engines that use the “M” type cylinder.

     
    Cogsy likes this.
  2. Sep 10, 2018 #2

    nel2lar

    nel2lar

    nel2lar

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    Bob
    You made a wonderful engine, looks great.
    I've always been partial to Elmer Verburg designs.
    Nelson
     
  3. Sep 13, 2018 #3

    loggerhogger

    loggerhogger

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    That is a truly unique and beautiful piece of work. Any chance you would be willing to publish the plans?
     
  4. Sep 14, 2018 #4

    bmac2

    bmac2

    bmac2

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    Thanks guys.
    If I had used the gears from the plans it would have been easier but what’s the fun in that.
    I have to say it’s motivated me to start look into making a tapping jig again.

    Logger the plans for Elmer’s engines can be downloaded from http://www.john-tom.com/html/ElmersEngines.html. They are in the public domain and there is a lot of information available here and online. Just be careful they can become addictive.
     
  5. Sep 17, 2018 at 12:52 AM #5

    toolznthings

    toolznthings

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    Super nice job !!
     
  6. Sep 17, 2018 at 7:29 AM #6

    olympic

    olympic

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    Of course, I believe that your "looks over function" lightened the flywheel spokes and effectively made the flywheel rim more massive, so to speak, than it would otherwise have been.

    Well done!
     

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