Raptor Composite Aircraft

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by Dexacare, Mar 28, 2016.

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  1. Jan 19, 2020 #3861

    wsimpso1

    wsimpso1

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    Good to hear that the pushrods are OK. I keep thinking of Marc's observations on Long-EZ back seat elevator control and how easily Peter seemed to get the second half of his stick deflection on his gauged pull.

    Also good to hear that the underlying sources of the flexibility have been identified. Single shear connections mean torsional deflection of the associated pieces. Lots of room for improvement in those elements by simple redesign where they are significant contributors. I hope that he starts with the largest contributors and works his way toward smaller ones.

    Billski
     
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  2. Jan 19, 2020 #3862

    donjohnston

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    Velocity still uses cables for the aileron. The push/pull tube system is an option for the center stick configuration. I believe it's standard for the side stick configuration since I haven't seen a side stick build without the push/pull tubes.

    I've thought about converting mine to push/pull tubes but cables have been around Velocity since the beginning and it works fine. Maybe a little stiffer action that push/pull tubes, but it flies fine for me.
     
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  3. Jan 22, 2020 #3863

    Staggermania

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    New video posted. Looks like Peter is going back to cable and pulley system.
     
  4. Jan 22, 2020 #3864

    Rik-

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    Why can't he do a push rod system? He cut a hole in the thing (thick in that area) so it looks like he could thread some rods in there to do a push rod system and be done with it.
     
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  5. Jan 22, 2020 #3865

    cheapracer

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    Yup, a number of items he says and does makes me think he reads here, or at least Boku's posts there ..

    Umm, the carbon fiber is kind of thick isn't it, maybe tanks for the military may have been a better way to go ....
     
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  6. Jan 22, 2020 #3866

    berridos

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    He doesnt seem to be aware of monocoque structures, with such a panzer keel. Looks like he has implemented the structure of a car. Specially absurd in the case of a pressurised fuselage.
     
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  7. Jan 22, 2020 #3867

    BoKu

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    I've added my usual two cents:

     
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  8. Jan 22, 2020 #3868

    pictsidhe

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    The rear pulleys look like they will probably be pretty close to the sides, so the 1/2" will probably be ok. But the ones in the tunnel look like they'll be a long way from the sides, and that 1/2" may be too springy.
     
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  9. Jan 22, 2020 #3869

    cheapracer

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    He'll read and think to himself: "Why would I use square tube"?

    He could turn the new pulleys he mentioned up in a few hours, shirley there's a local shop to him.
     
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  10. Jan 22, 2020 #3870

    BoKu

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    The section shown at time code 0:40 appears massive. If that's solid carbon and not a sandwich, well, now we know where some of the half-ton of extra mass comes from. I can't imagine what they were thinking making it that thick.
     
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  11. Jan 22, 2020 #3871

    TarDevil

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    IIRC, the halves didn't mate well and they backfilled with CF.
     
  12. Jan 22, 2020 #3872

    BoKu

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    That hole would give him access to install a bellcrank that runs the drive around the corner from the keel up the aft bulkhead. But he'd have to thread the tube in from the nosewheel bay, and unless it's a very large tube he'd have to install a mid-keel support or guide. I suspect that the constriction that forced the use of cables instead of push-pull tubes is at the wing root rib or at the outboard end of the strake, so he might have to retain the cables in the strakes. But push-pull tubes to a drive wheel at the upper aft bulkhead, and a cable loop between the outboard ends of the strakes, might indeed be a good compromise that yields a flightworthy roll control system.
     
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  13. Jan 22, 2020 #3873

    BJC

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  14. Jan 22, 2020 #3874

    cheapracer

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    Which leads to that question I have searched for for years, traversing Continents, crossing mountain ranges and fording the deepest rivers, to seek out the answer that not even '42' can resolve:

    Why are pages left intentionally blank????
     
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  15. Jan 22, 2020 #3875

    Tiger Tim

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    So new chapters start on the right hand side of the open book, or because information was edited on a couple pages but overall page numbering is to be retained, or they’re in there as note paper.
     
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  16. Jan 22, 2020 #3876

    pictsidhe

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    ah, but then they'd be non standard. Any fool also knows, aluminium pulleys would be heavier than gr4 or whatever it is 'proper' pulleys are made from.
     
  17. Jan 23, 2020 #3877

    cheapracer

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    My first choice in this situation would be hardwood actually.


    PDFs ....
     
  18. Jan 23, 2020 #3878

    pictsidhe

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    Hmmm, plywood with rivets near the rim to prevent splitting?
     
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  19. Jan 23, 2020 #3879

    Andy_RR

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    Magnesium for lightweight and improved control authority during cabin fires.
     
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  20. Jan 23, 2020 #3880

    cheapracer

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    Well I would do that for a test run, cents in the dollar to find out if it works or not.

    This is an example of his poor management, going to wait a week for new parts to arrive, and he doesn't even know if they will cure the issue. If they don't work, he's lost a week, money and momentum.


    Err, how exactly does magnesium improve anything during a fire, ever seen mag burn?
     
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