Folding wings without disconnecting controls?

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by cluttonfred, Mar 9, 2019.

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  1. Apr 2, 2019 #21

    Riggerrob

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    Remembering back to when I was young and beautiful and covered in helicopter grease .......

    Sikorsky Sea King helicopter provides a couple of hints. First, most of the controls are push-rods and bell crank pivots match stowing hinge lines.

    Secondly, the tail pylon hinges away from the tail rotor drive shaft. They are disconnected when folded, but castellated gears nest to connect them in the flight configuration. Castellated gears would be great for torque tune controlled ailerons. You just need a few springs or cams to consitantly align inboard and outboard torque tubes.
     
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  2. Apr 2, 2019 #22

    gtae07

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    Please tell me you’re sticking to the experimental side and not certified...
     
  3. Apr 2, 2019 #23

    Sockmonkey

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    Hopefully this is clear. Only the short bit between the wing root and stick goes slack so it's easy to see and tension.
    [​IMG]
     
  4. Apr 10, 2019 #24

    ScaleBirdsPaul

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    While at Sun N Fun last week I was checking out the A-1 Skyraider folding mechanism and found this that might be of interest to this thread. Looks like the aileron bellcranks maintain a fixed distance as the wing rotates, allowing the pushrod running fore-aft to remain connected and alignment taken up by the rod-end bearings. If I remember correctly the aileron was deflected in this position.
     

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  5. Apr 10, 2019 #25

    blane.c

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  6. Apr 10, 2019 #26

    blane.c

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  7. Apr 10, 2019 #27

    blane.c

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  8. Apr 10, 2019 #28

    cluttonfred

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    I love those Grumman designs with the multiple tails, accepting some increase in drag and weight to get generous tail volume within strict dimensional limits. It gives me ideas about using multiple vertical and even horizontal tails to fit more airplane in a smaller overall package. How about a four-seat cabin biplane that fits inside a 20' shipping container? ;-)

     
  9. Apr 10, 2019 #29

    blane.c

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    Biplane is going to be hard to fold the wings without disconnecting anything, maybe some of that good ol' magic eh?
     
  10. Apr 10, 2019 #30

    cluttonfred

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    I was thinking biplane to get enough wing area in a 20' container. Control connections come later. Or maybe a big Pou-du-Ciel, say 21' span and 5' chord front and back for 210 sq ft of wing area and no aileron controls to connect, a cross between a Mignet HM.1000 Balerit and a Croses B-EC-9 Paras Cargo wiht twin rudders and a rear cargo hatch or loading ramp! ;-)

    640px-Mignet_HM-1000_Balerit_AN0354143.jpg file.jpg
     
  11. Apr 11, 2019 #31

    Riggerrob

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    How do we classify wing-folding mechanisms?
    ..... by hinge orientation?
    ..... by the direct wings fold to stow?
    ..... stowed/parked/hangared position?

    Tilt up wings: Pou de Ciel, Monet Onex, Grumman Bearcat, etc.

    Fold individual wings backwards to lay (horizontal) alongside the aft fuselage: many biplanes, etc.

    Pivot (single-piece wing) to lay flat on top of the fuselage: Backyard Flyer, CV-22 Osprey, etc.

    Wings that fold and pivot to lay (almost) flat against fuselage sides (Grumman Sto-wing and Stits Playmate)?

    Does the ICON’s pull-and-pivot mechanism qualify as a lateral hinge?

    Is it better to stow wings leading edge up ..... or leading edge down (Grumman)?

    Master. Corporal (retired) Rob Warner
    Folded dozens of CF-18s and hundreds of Sikorsky(s) and thousands of parachutes.
     
    Last edited: Apr 11, 2019
  12. Apr 11, 2019 #32

    Sockmonkey

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    Hmmm...
    [​IMG]
     
  13. Apr 11, 2019 #33

    blane.c

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    So you can fly around a troupe' of Hooter's?
     
  14. Apr 11, 2019 #34

    Sockmonkey

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    Huh? I'm missing the joke.
     
  15. Apr 11, 2019 #35

    blane.c

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    Transport aircraft sized.
     
  16. Apr 12, 2019 #36

    Sockmonkey

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    Ah, yes. That one is around the size of a dehavilland beaver.
     
  17. Apr 12, 2019 #37

    blane.c

    blane.c

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    The Beaver, takes-off at 60, fly's at 60, and lands at 60.
     
  18. Apr 12, 2019 #38

    Riggerrob

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    Yes!
    But a Beaver is still faster than a dog sled.
     
  19. Apr 12, 2019 #39

    Riggerrob

    Riggerrob

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    -----------------------------------------------------------------

    As early as World War 1, biplanes folded with a minimum of fuss. They treated wings as giant box that folded aft to lay beside the aft fuselage. For example, the Vickers Vimy bomber folded its wings to fit inside existing hangars. Hinges (vertical axis) were bolted to the rear spars. Control cables ran near the hinges so few - if any - cables needed to dis-connect to stow it in a hangar.

    WW2 vintage Supermarine Seagulls and Farey Swordfish had similar wing fold mechanisms.
     
  20. Apr 12, 2019 #40

    saini flyer

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    Matthew, I like this idea very much. The big croses flea design proves the good load hauling capacityas a 180hp six seater so why there is no 4 seater flea design? Why are there mostly single seat and some two seater fleas. Maybe even something like a 2+2 may be possible with that huge biplane wing area on a small ~100hp auto engine like Aeromomentum.
    • 2+2 seater
    • Same front and rear wing (with identical three sections each) for folding @ 8' as you mentioned
    • Twin rudders on each side of the rear cargo hatch
    • Small 100hp engine
    • Performance close to a STOL LSAs including empty weight but 700-800 lbs payload capacity.
    • Fritz special .....full CNC & <400 hr build time with 45" cabin width :)
    • and only one tire on each side of the main landing gear
     

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