Cogsy's Rupnow Vertical

Discussion in 'Finished Projects' started by Cogsy, Mar 20, 2017.

  1. Mar 20, 2017 #1

    Cogsy

    Cogsy

    Cogsy

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    I'm finally calling my Rupnow Vertical finished so I thought I'd make a rare post (for me) in the Finished projects area. I abandoned the idea of mounting a fan for now and I still have to attach some rubber feet to the base but otherwise it's complete.

    Here's some pictures of how it turned out, plus a video of it running pretty well now. At about the 1:45 mark I hand start it for the first time ever and it idles super slowly for me. As I suspected it is quite a well balanced engine and the vibration you can hear is mainly because of the 1/4" table top with virtually no supports flapping about. With some rubber feet and a sturdy table I think it'll happily sit in one place and run all day long.

    [​IMG]

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    [​IMG]

    [ame]https://www.youtube.com/watch?v=dRmc6s-I2Co[/ame]


    Now for a big long wait til I can get back to my shed :(
     
  2. Mar 20, 2017 #2

    rac37

    rac37

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    Very nice running engine you have there. I like it.

    bob
     
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  3. Mar 20, 2017 #3

    ShopShoe

    ShopShoe

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    Congratulations Cogsy on a nice, smooth running engine.

    It looks nice, too.

    Well Done

    --ShopShoe
     
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  4. Mar 20, 2017 #4

    Brian Rupnow

    Brian Rupnow

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    Cogsy---It's a beautiful thing. Thank you for posting.---Brian
     
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  5. Mar 20, 2017 #5

    DavidLloyd2

    DavidLloyd2

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    Congratulation Cogsy
    Looks Great and Runs nice.

    Thanks for the video,

    DavidLloyd
     
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  6. Mar 20, 2017 #6

    Johno1958

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    Good one Cogsy she is a beaut
    John
     
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  7. Mar 20, 2017 #7

    Herbiev

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    Well done Cogsy. A great runner
     
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  8. Mar 21, 2017 #8

    Niels Abildgaard

    Niels Abildgaard

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    The moving around on table can be almost eliminated and engine more interesting to watch by a simple modification .I think Brian Rupnows design leaves room enough to do it.
    If interested give me mass and dimension of piston and conrod or a link to where I can see the plans.
     
  9. Mar 21, 2017 #9

    Cogsy

    Cogsy

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    I don't have the mass of the piston or conrod. The conrod would be reasonably close to the plan size but the piston is made from aluminium rather than cast iron that the plans state, plus the grooves are completely different to plan as I used cast iron rings rather than the single o-ring as designed. Really though, it takes very little to hold the engine in place, even on this flimsy table (it's a weird folding table with the top folding in half and has massive overhang of the legs when set up, plus on 1/4" pine to boot). I'll source some rubber feet and then I'd guess it'll stop moving entirely.

    The plans can be found in Brians' build thread, post #136 LINK.
     
  10. Mar 27, 2017 #10

    minh-thanh

    minh-thanh

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    I LOVE YOUR ENGINE - Cogsy !!!
     
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  11. Apr 10, 2017 #11

    de98441201

    de98441201

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    very beautiful , i also want to make one。can share the drawings ?
     
  12. Apr 10, 2017 #12

    Brian Rupnow

    Brian Rupnow

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    Check out this link. There is a download link for the plans in there near the end. I am the person who originally designed this engine.--Brian Rupnow
    http://www.homemodelenginemachinist.com/showthread.php?t=25727
     
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  13. May 28, 2017 #13

    minh-thanh

    minh-thanh

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    Hi Cogsy !!
    Can you tell me the weight and diameter of flywheel?
     
  14. May 29, 2017 #14

    Cogsy

    Cogsy

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    Not really sure on the weight. It's a bronze outer ring with aluminium centre approximately 130mm diameter to the outside. I don't really want to remove it to weigh it as it's being good and not loosening up on me at the moment. It is quite heavy though, mostly just the outer ring.
     
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  15. May 29, 2017 #15

    michael-au

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    Well done Gogsy nice looking and great running engine
     
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  16. Jun 30, 2017 #16

    SwarfMuncher

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    Sweet! Nicely done! :)
     
  17. Sep 18, 2017 #17

    de98441201

    de98441201

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  18. Sep 18, 2017 #18

    deeferdog

    deeferdog

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    Good one Cogsy, very sweet! Cheers, Peter.
     
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  19. Dec 10, 2017 #19

    Niels Abildgaard

    Niels Abildgaard

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    Have tried to model a smooth-running variation.


    Piston shall be as ligth as possible.
    The Balaleika like conrod plus piston in place shall balance around crankpin hole
    When this is put on crank the center of gravity of mowing parts shall be on crankshaft centerline.
    It is very easy on computer CAD.
    The version shown is alu piston and conrod .
    Crankdisc is steel.

    rupnowopen.jpg
     
  20. Jan 2, 2018 #20

    pat_pending

    pat_pending

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    Congratulations Cogsy. Lovely engine. Looks and runs great. Think the Rupnow is tempting as a second I/C engine build for me now having seen this.
     
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