Flea style "Piojo Flying MiniBike"

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by FritzW, Oct 26, 2015.

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  1. Aug 28, 2019 #441

    FritzW

    FritzW

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    How do you plan to fold the wings without a center section? How would disconnecting the split wing pivot bearing be simpler than the standard flea wing fold.


    Why would making the front wing fixed and putting elevons on the rear wing be better?

    The idea behind the Piojo is a simple 3 axis flea. I think the best way to approach that is to just make a standard 2 axis flea and give it ailerons. The simplest and safest way to do that is to put them on the rear wing.
     
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  2. Aug 28, 2019 #442

    Hot Wings

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    Fritz - quit trying to heard cats.;)

    You're the chief engineer. Take the advice into consideration, make a decision and move on. :cool:
     
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  3. Aug 28, 2019 #443

    FritzW

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    Yep...
     
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  4. Aug 28, 2019 #444

    Sockmonkey

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    Make the center bearing a universal joint and you don't have to disconnect it to fold the wings back.
    I don't think a fixed front wing with rear elevons would be better.
    If you want elevons, put them on the front wing and you don't need to tilt the wing at all.
     
  5. Aug 28, 2019 #445

    erkki67

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    DCE7DC84-935E-4469-A1AA-F21E7986798B.jpeg I’build the rear wings as a complete ailerons, as we were discussing it for the forward wing.

    So this way the Flea could be built either as a two axis or a conventional 3 axis bird.
     

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  6. Aug 28, 2019 #446

    erkki67

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    But if the fwd wing shall be a elevons the a mixer aka Horten would make most sense to me, with the control tubes going as vertical as only possible towards the attachment link to the wing.

    Then there would be no controls outside the fuselage width.
     
  7. Aug 28, 2019 #447

    Victor Bravo

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    Jackpot !
     
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  8. Aug 28, 2019 #448

    erkki67

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    It’s fine for me with the rear wing as ailerons
     
  9. Aug 29, 2019 #449

    erkki67

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    Fritz, how about the possibility to build the Piojo in elements, the wings in 3 pieces and the fuselage in 2 pieces?

    The idea is to build it in a flat, in a city somewhere in 4th or more floor flat.

    And if the fuselage could be split for transport, the trailer would get shorter too?!

    The Airbike was delivered with a spit fuselage, but this was to reduce shipping costs.
     
    Last edited: Aug 29, 2019
  10. Aug 31, 2019 #450

    Tiger Tim

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    Since we were talking a page or two ago about the need for constant back pressure on the stick of all but the very last Fleas (for some reason), is there a compelling reason you can’t just stick a trim tab on the forward wing to fly hands-free?
     
  11. Aug 31, 2019 #451

    Aerowerx

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    IIRC some of the flea versions had a 3 piece wing. The outer panels folded upwards and inwards over the center section, for compact storage.
     
  12. Aug 31, 2019 #452

    FritzW

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    Let's see if the forum lets you quote from a different thread...
    Matthew said a few posts later that bungee cords were the typical way to trim out the back pressure. I think either one would work fine as long as it was cockpit controllable.

    ...adjustable trim tabs on the wing might keep the stick forces lighter (you wouldn't have to work against the bungees)
     
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  13. Aug 31, 2019 #453

    Sockmonkey

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    Ease of disassembly was one of the reasons I advocated the split wing.
    Having no moving bits aft of the pilot means the aft wing can just be slid onto the fuselage tube, held in place with a pin. If the control stick and pushrods are attached to the nose structure rather than the fuselage tube itself, then the tube can be likewise removed from that, and you wouldn't even need to remove the fore wing from it.

    [​IMG]
     
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  14. Aug 31, 2019 #454

    Victor Bravo

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    ^^^^^^^
    See, now that's genuinely clever. That disassembly/transport/storage goal makes it worth looking into some of the exotic control hookup stuff that has been iscussed.

    Now you're talking about a much smaller trailer, or storing it in a one-car garage, etc.

    If you're using a square tube for the main fuselage like that, maybe drill more than one hole for each major wing or nose section attach location, so you can balance the aircraft for a wider range of pilots without adding or removing ballast.
     
  15. Aug 31, 2019 #455

    Sockmonkey

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    Thanks. I probably should have posted that bit earlier.
     
  16. Aug 31, 2019 #456

    Battler Britton

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  17. Aug 31, 2019 #457

    Battler Britton

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  18. Aug 31, 2019 #458

    Tiger Tim

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    Battler beat me to it. How much smaller do you want to go?
     
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  19. Aug 31, 2019 #459

    FritzW

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    There's some good footage of a flea being towed by a scooter starting at about 30:00 ...and my favorite scene at 31:44 of a guy pumping gas with a cigarette hanging out of his mouth ;)

    You could almost modify the scooter to mount the wings. You could fold them for towing, unfold them for flying or detach them for running around town. ...hummm, I wonder if there's a scooter model on grabcad

     
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  20. Sep 1, 2019 #460

    Sockmonkey

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    Probably wouldn't be too hard to mount flea wings on a recumbent motorcycle, and tow the wings folded up when driving like that one flying car did. Might actually be a viable roadable design.

    To Sketchup! WOOOOOSH!
    [​IMG]
    And there we go.
     
    Last edited: Sep 1, 2019
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