Quant 23 Foiler Scow

Discussion in 'Sailboats' started by Doug Lord, Jun 8, 2015.

  1. Doug Lord
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    Doug Lord Flight Ready

    Quant 23 Foiling Scow Keelboat

    New picture of the production boat foiling with three crew:

    [​IMG]
     
  2. projetdared
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    projetdared Junior Member

    IT looks more and more to the monitor. Specialy with the guy sitting in the cockpit.
    [​IMG]
     
  3. Doug Lord
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    Doug Lord Flight Ready

  4. Skyak
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    Skyak Senior Member

    Quite an amazing guy. It is hard to believe the speeds they hit back then -with wood cotton and steel for materials! I was also amazed to read that the foils were "computer" controlled. I can't imagine any way that could be digital so there must be a reasonably simple analog computer able to handle the task. And all it's inputs are forces! Analog 'computers' all have mechanical equivalents.
     
  5. Doug Halsey
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    Doug Halsey Senior Member

    I second your amazement & would also like to know more about his "computer."

    Some hints are given in a paper written by him, available at :

    https://babel.hathitrust.org/cgi/pt?id=uc1.$b672020;view=1up;seq=251

    I've excerpted one paragraph below (Click to enlarge).

    Since this research was sponsored by the U.S. Navy, it's possible that some more diligent Googling might turn up more details.
     

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  6. Doug Lord
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    Doug Lord Flight Ready

    No mention of weight unless I just missed it?! Doug, have you found any info on Monitors weight?
    UPDATE-I found this on foils.org:
    Somewhere in my design notes I have written down Baker's foil chord lengths. I seem to recall Baker told me that MONITOR weighed 800 pounds, which surprised me how light it was. -- David A. Keiper
     
  7. Doug Halsey
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    Doug Halsey Senior Member

  8. Doug Lord
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    Doug Lord Flight Ready

    Wow-that history is so cool. I wouldn't have thought to look up the history of the plant! Way to go, Doug!
     
  9. Doug Halsey
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    Doug Halsey Senior Member

  10. Doug Lord
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    Doug Lord Flight Ready

    Wasn't a problem-I just copied it and pasted in the browser and it came up. Couldn't get it to work as a link though-I've never run into that before-what did you do?
     
  11. brian eiland
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    brian eiland Senior Member

    WOW, I haven't seen that photo in YEARS !!
     
  12. Doug Halsey
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    Doug Halsey Senior Member

  13. Doug Halsey
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    Doug Halsey Senior Member

    I simply copied & pasted the link & then underlined it, the same way that I thought I had always done it.

    Since then, I've been using the "Insert Link" icon above the text.
     
  14. Skyak
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    Skyak Senior Member

    This patent document does a pretty good job of detailing the flight control "computer". All the stays and even the main sheet forces are applied to a space frame that is linked to the hydrofoils angle of attack. It appears to be nothing more than an elaborate spring and damper, but there is one add I still don't understand -it looks like a propeller on a drum (don't know what's inside) on a four bar mechanism. I want to know if wind power is being used for 'active control' or if the entire Monitor flight system is just force/deflection. Clearly the steady state can be worked out to force deflection, but I wonder about dynamic responses or running into nonlinear responses.
     

  15. Doug Halsey
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    Doug Halsey Senior Member

    Are you referring to the last figure (Fig.14, Sheet 10)?

    If so, the text says " Fig. 14 is a fragmentary schematic view illustrating the manner of incorporating the incidence adjustment in a boat driven by an air propeller." So, it doesn't apply to Monitor itself.

    I'm not a mechanical expert by any stretch of the imagination, but I'm pretty sure that the system is just force/deflection.
     
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