YourDyno.com

Discussion in 'Hangar Flying' started by wanttobuild, Jan 24, 2019.

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  1. Jan 24, 2019 #1

    wanttobuild

    wanttobuild

    wanttobuild

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    I have got alot of projects going on, short on time (chasing the almighty dollar bill) and this year i am remodeling an old farm house. Located on a really nice county road with visibility, (super nice runway) free!

    The only project i really care about is the modified motor glider. With a 35ft. wingspan, it doesn't require a great deal of power.

    I have been collecting some 4A084 engines with more to go get, and my wife is pissed. lol

    So, i am adding another project, build a dyno to test my engine modifications, namely turbocharging and various charge injections. a cocktail of liquids and gases.

    Anyone here using a homebuilt dyno?
     
  2. Jan 24, 2019 #2

    pictsidhe

    pictsidhe

    pictsidhe

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    An Eiffel wood bar dyno is as simple as they get. Planning to use one (well, a selection) when I start getting my fingers oily. It's a square piece of wood bolted on to the output shaft.
     
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  3. Jan 25, 2019 #3

    wanttobuild

    wanttobuild

    wanttobuild

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    I will look into the Eiffel Bar. Thanks Pitc

    Found it, a balanced square wood bar with its section 1/15 its length. Gustave Eiffel.

    The Cri Cri designer came up with the formula to convert rpm to available HP. More than good enough for me. Much cheaper than a load cell and all that instrumentation.
     
    Last edited: Jan 25, 2019
  4. Jan 25, 2019 #4

    TFF

    TFF

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    Club prop dynos have been discussed here often. If your Google-fu is good there is a Fltzer biplane owner who used them on his VW. May be on the Hoover blog. There are portable outboard motor portable dynos if you want a brake dyno. I don't think you can scrounge the parts for less but it still will cost more than the actual plane.
     
  5. Jan 25, 2019 #5

    blane.c

    blane.c

    blane.c

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    Can you provide some links for more information on the Eiffel Wood Bar? I'm getting a lot of designer wooden bar stools. Got to love internet algorithm, it goes for sales first every time.
     
  6. Jan 25, 2019 #6

    wanttobuild

    wanttobuild

    wanttobuild

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    I will build my own for $500. Manual data gathering.
     
  7. Jan 25, 2019 #7

    BJC

    BJC

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    Add “dyno” to the search subject.


    BJC
     
  8. Jan 25, 2019 #8

    blane.c

    blane.c

    blane.c

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    didn't help
     
  9. Jan 25, 2019 #9

    wanttobuild

    wanttobuild

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    BlaneC
    Google gustav eiffel wood bar dyno
     
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  10. Jan 25, 2019 #10

    blane.c

    blane.c

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  11. Jan 25, 2019 #11

    wanttobuild

    wanttobuild

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  12. Jan 25, 2019 #12

    blane.c

    blane.c

    blane.c

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    Finally.

    WOOD BAR DYNO 1.jpg WOOD BAR DYNO 2.jpg WOOD BAR DYNO 3.jpg added sketch because it took a while to figure out.
     
    Last edited: Jan 25, 2019
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  13. Jan 25, 2019 #13

    blane.c

    blane.c

    blane.c

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    So if I am getting this right to swing a 508mm (20") x 33.866mm (1.333") piece of wood at 6,000 RPM would take about 21hp?
     
  14. Jan 25, 2019 #14

    BJC

    BJC

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    It took me right to the page you show in post #12.


    BJC
     
  15. Jan 25, 2019 #15

    blane.c

    blane.c

    blane.c

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    Your just gooder than me.
     
  16. Jan 25, 2019 #16

    lr27

    lr27

    lr27

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    I think Google results tend to be personalized, so they must not believe you mean what you say. Try a couple of the computers at the library.
     
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  17. Jan 25, 2019 #17

    wanttobuild

    wanttobuild

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    It is HARD to break the Google chokehold, they track your every move and sell that information. I search on a regular basis, 'Bomb', 'C4' 'Det Cord'
     
  18. Jan 25, 2019 #18

    Vigilant1

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    Yes. I've got Jan Carlsson's program that includes the Eiffel equation spreadsheet, and the results match your math.

    For little industrial engines:
    An engine of 22 claimed HP at 3600 RPM should be able to swing a 46.4mm x 46.4mm cross section club that is 696mm diameter at that RPM.
    An engine of 23 claimed HP at 3600 RPM should be able to swing a 46.8mm x 46.8mm cross section club that is 703mm diameter at that RPM.
    An engine of 28 claimed HP at 3600 RPM should be able to swing a 48.7mm x 48.7mm cross section club that is 731mm diameter at that RPM.
     
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  19. Jan 25, 2019 #19

    blane.c

    blane.c

    blane.c

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    Thank you.
     
  20. Jan 26, 2019 #20

    pictsidhe

    pictsidhe

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    I made my own spreadsheet. There's a nicer one out there from Jan.
     

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