Single Tube Fuselage idea

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by FritzW, Aug 11, 2016.

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  1. Oct 11, 2018 #221

    Sockmonkey

    Sockmonkey

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    Could do that, though you will have to mount the engine higher.
    Hmm, maybe use a belt drive to keep the engine low and still clear the water.
     
  2. Oct 11, 2018 #222

    blane.c

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    Have engine drive generator, have generator power electric motor(s)
     
  3. Oct 12, 2018 #223

    deskpilot

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    I think we have a serious thread drift here. Care to get back to the title subject guys.
     
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  4. Oct 22, 2018 #224

    saini flyer

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    I am wondering why no one has mentioned Genisis slipstream yet!
    Instead of the large spacing between the top tubes of the tail cone, make the spacing at par with the bottom tubes and mount the engine upfront. Keep all of Fritz's single tube concept and use cross beam members riveted as in the slipstream for a single seater or even a side by side fuselage build.... BTW, I have no idea how to bend to correct accuracy to mirror both sides of the fuse....
    1.jpg
    genesis slipstream 2 seater drawing.jpg
    page4-1004-full.jpg
     
  5. Oct 22, 2018 #225

    wsimpso1

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    Wing structure will have to get beefy indeed to survive wing pitching moments plus lift through the fittings at the strut connections...

    Two conventional struts per side plus four short struts from fuselage to wing center section will allow a lot less weight, if conventional...

    Billski
     
  6. Oct 22, 2018 #226

    lr27

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    Not sure they have to be THAT beefy. The span is short already, and then it's divided into 3 pieces. Assuming the wing pivots around the strut attachments, I'm not sure what the wing pitch control is, but that can probably be solved. A thick airfoil with a moderate pitching moment, such as a 23018, might help with wing torsion issues. A movable elevator would, of course, make things simpler.
     
  7. Oct 23, 2018 #227

    proppastie

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    TLAR aerodynamics and loading, and stress analysis.....?
     
  8. Oct 23, 2018 #228

    lr27

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    Well, we know there are light airplanes of comparable size with cantilever wings. The spans involved here are much shorter. We also know of light airplanes of comparable size and thinner wings that have ailerons. If we're not using an extreme airfoil, it won't have a larger pitching moment than you get with ailerons. If those other aircraft can take the pitching moment, our hypothetical, thicker wing ought to as well. So it may be TLAR, but it's not necessarily wrong or invalid.

    A conventional setup could be made, of course, lighter. Anyone know why the Pou doesn't use an elevator?
     
  9. Oct 23, 2018 #229

    Victor Bravo

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    The elevator requires essentially two separate flying surfaces, the stabilizer and the elevator. One additional spar to carry the hinges on one side, and one leading edge spar on the elevator to carry the hinges on the other. Even if you mounted the elevator on the front wing, making it a canard of some sort, there are still extra parts. So Mignet's design eliminated the extra parts for the separate elevator regardless of whichw ing it would have been mounted on.
     
  10. Apr 8, 2019 #230

    billyvray

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    what kind of generator do you refer too? I'm genuinely curious about an application I have in mind.
     
  11. Apr 8, 2019 #231

    blane.c

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  12. Apr 8, 2019 #232

    blane.c

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  13. Apr 8, 2019 #233

    blane.c

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    So looking at the Launchpoint Hybrid 45kw. It turns at 6000rpm. If you wanted a more "sedate engine" like 2000rpm or 3000rpm just make the rotational mass a greater diameter. It is the velocity of the magnets passing the windings that makes power not the revolutions of the crankshaft.
     
  14. Apr 8, 2019 #234

    blane.c

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    It is the Holbach array that makes it possible to make the generator and motor light enough to be practical.
     
  15. Apr 10, 2019 #235

    Sockmonkey

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    Thank you. While I do engage in a bit of TLAR, I tend to base it on pre-existing configurations and structures known to work.
    For that particular one, the wing pivots like on a pou, with a fixed elevator (but ground adjustable) that's only there to provide pitch stability.
     

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