Prop design software/books

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by Hephaestus, Jun 16, 2019.

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  1. Jun 16, 2019 #1

    Hephaestus

    Hephaestus

    Hephaestus

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    Well last thread was 2010, most of the links and software are gone.

    I want to grab Jack Norris's book. But I can't say as I even have cheques anymore. Guess I'll have to fork out for a USD money order that costs more than his book to get it.

    Any current good software options? I'd love something that can export a shape for CNC cutting not just a few profiles?

    The hub/flywheel is going to get cut in the next couple weeks for the vanguard. Thinking working from baseline through the build step by step with testing makes the most sense. And provides data useful to others. Laminating up a few dozen blades and letting the cnc run makes more sense than 500$+ea when you're guestimating needs anyway.
     
  2. Jun 17, 2019 #2

    pictsidhe

    pictsidhe

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    Fred Weick wrote a good book way, way back when. Modern freeware: Martin Hepperle's Javaprop
    I have more resources, but those are the best.

    Test your engine with an Eiffel club prop before carving a real propeller. Hang on, you're Canuckian, do you say airscrew as Brits do?
     
  3. Jun 17, 2019 #3

    Hephaestus

    Hephaestus

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    Nope we're too 'Murica!nized ;) I don't think Brits have called it an airscrew since the 30s either.

    I looked at javaprop - but java was removed as security risks long ago. Maybe I have an old Linux box I can run it on.

    Club props give hp #s sure, but don't do much for thrust and starting to look at cooling needs.
     
  4. Jun 17, 2019 #4

    pictsidhe

    pictsidhe

    pictsidhe

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    I run Javaprop offline on Ubuntu or Debian. I removed Windows as a security risk years ago ;)
     
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  5. Jun 17, 2019 #5

    Victor Bravo

    Victor Bravo

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    Get some US currency from someone, and mail it to Jack. He's a great guy and wants to see his book read and used.
     
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  6. Jun 17, 2019 #6

    Hephaestus

    Hephaestus

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    Oh I don't doubt it. Just wish he had other options ;)

    I hate mail lately. Safely between Canada post USPS and both countries customs - everything I need is like 3 months behind because of them. That turbo for the vanguard appears to be lost in the new Canada customs mail processing plant for a month+ now...
     
  7. Jun 17, 2019 #7

    pictsidhe

    pictsidhe

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    I looked at Jack Norris's web page. It reminds me of a myriad free energy sites...
    However, the lemniscate shape of the optimum thrust distribution along the blade is correct, so his writing style may be the funky part. He also references Theodoresen, who wrote a long multi part paper on propellers. Betz is the grandfather of propeller analysis.
    I may have to buy yet another book now...
    The perfect prop for me can wait until I have flight tested.
     
  8. Jun 17, 2019 #8

    plncraze

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    When you read Jack's book be ready for a different "style" of writing than you may be used to. Don't let that stop you.
    The charts from the David Taylor Basin are in an article by Quentin Wald.
    Theodore also wrote a book. Had it in my hand but never read it. It is about prop design and was published in the late 1940's.
     
  9. Jun 17, 2019 #9

    pictsidhe

    pictsidhe

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    Theodoresen's book is long and highly technical. It is in several parts. It is not for the faint of math.
     
  10. Jun 17, 2019 #10

    BBerson

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    Quentin Wald lives here. He also wrote a book about the Wright Flyer's stability. His father flew for the Wrights.
     
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  11. Jun 17, 2019 #11

    plncraze

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    BBerson, do you know him? If so thank him for his prop article that has the David Taylor Basin stuff. Real good stuff!
     
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  12. Jun 18, 2019 #12

    BBerson

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    I haven't talked to Quentin in over ten years and he was 90 then. I doubt he is still around now. He helped me with helicopter rotor calculations.
     
  13. Jun 18, 2019 #13

    plncraze

    plncraze

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    I looked him up by name and looks interesting. I will have to get the Kindle version of his Wright book.
    For those interested in props read Lu Sunderland's interview with Henry Rose in an old Sport Aviation. Rose was Chief Designer at Sesenich. There are a few other articles of interest in Sport Aviation. When you dig in you will find that some of these guys, like Rose, really had a good trip on how to design props. While Paul Lipps got a lot of coverage in Contact and Jack Norris has done cool experiments and has an interesting book I would still recommend Quentin Wald as a gateway to understanding props and how they work. I tried to find it online and put in a link but couldn't find it.
     
  14. Jun 18, 2019 #14

    Hephaestus

    Hephaestus

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    One if the ones I was curious about was some of the 60/70s era oddballs, warnekes almost constant speed etc.
     
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  15. Jun 18, 2019 #15

    plncraze

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    There is a cynical joke in aviation, and probably other places as well, that there is nothing new. Many things have been invented and forgotten. In an old Sport Aviation there is an article titled "Why the 'S' Shaped Prop." I believe it is by Bob Whittier. The prop has a shape that will allow it to flex, go to fine pitch and let the engine rev up at full throttle but will bend back when pull the throttle is pulled back. High Lorimer wrote about his version of this prop on this site. I think Warnke's prop did the same thing.
     
  16. Jun 18, 2019 #16

    Hephaestus

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    Yup, sometimes old ideas need a bit of recycling ;)
     
  17. Jun 18, 2019 #17

    Victor Bravo

    Victor Bravo

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    Jack's writing is not easy to take for long periods, and he does indeed understand that. But the value of his book, both sides of his book, is definitely there.
     
  18. Jun 18, 2019 #18

    TerryM76

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    I've got two copies of his book......not sure why, but I do have two. One copy At home and another on my book shelf at school. And sometimes I read one of them.
     
  19. Jun 18, 2019 #19

    Hephaestus

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  20. Jun 18, 2019 #20

    pictsidhe

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    I didn't think that I was going to be the first...
     

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