Wing Fold/Hanger Space

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by 103, Oct 5, 2019.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Oct 5, 2019 #1

    103

    103

    103

    Well-Known Member

    Joined:
    May 3, 2015
    Messages:
    136
    Likes Received:
    75
    Location:
    Wauwatosa WI
    Ideal Wing fold is a 10 minute one person job. Road ability is secondary to the ability to slot in and share a scarce commodity of hanger space. I have plans for FRED which is what Scott Perkins terms a compound fold. Leading edge points to the ground and wing folds parallel to the fuselage.

    I have attached a few pictures of a FP101 with a custom semi compound arrangement. This has an advantage over a kitfox swing back wing in that you do not need the complexity removing the rear cabin and of flaps to swing up when folding along side the cabin.

    Balancing the need to keep it simple robust and not add much to the empty weight is where the sharp pencil is needed.

    Please share your designs on this thread for educational use. The 101 in the pictures was built in the early 80's in Wisconsin. The Snap shots are all I have I did not build it. It appears to add a second V to pivot the wing. The Pictures do not provide enough detail. 20191004_204531_resized.jpg 20191004_204537_resized.jpg
     

    Attached Files:

    FritzW likes this.
  2. Oct 5, 2019 #2

    Riggerrob

    Riggerrob

    Riggerrob

    Well-Known Member

    Joined:
    Sep 9, 2014
    Messages:
    1,196
    Likes Received:
    344
    Location:
    Canada
    That “pitched roof” will shed snow loads better than wings that fold to create a “flat roof.”
    Why care?
    A few years back, during a heavy snow storm, a Piper-type wing collapsed.
     
  3. Oct 6, 2019 #3

    pictsidhe

    pictsidhe

    pictsidhe

    Well-Known Member

    Joined:
    Jul 15, 2014
    Messages:
    6,980
    Likes Received:
    1,926
    Location:
    North Carolina
    That looks more like a removeable wing with storage brackets. Perhaps the main V strut has a pivot.
     
  4. Oct 6, 2019 #4

    Dana

    Dana

    Dana

    Super Moderator Staff Member

    Joined:
    Apr 4, 2007
    Messages:
    8,688
    Likes Received:
    3,064
    Location:
    CT, USA
  5. Oct 6, 2019 #5

    Riggerrob

    Riggerrob

    Riggerrob

    Well-Known Member

    Joined:
    Sep 9, 2014
    Messages:
    1,196
    Likes Received:
    344
    Location:
    Canada
    If you want to use wing struts as part of the folding mechanism, what about Stitts Playmate?
    It has a low wing braced by V struts terminating bear the lower corner of the windshield. Pulling the front spar locking pin allows folding wings back to the tail. A travelling brace holds wing tips against the tail.
     
  6. Oct 6, 2019 #6

    Riggerrob

    Riggerrob

    Riggerrob

    Well-Known Member

    Joined:
    Sep 9, 2014
    Messages:
    1,196
    Likes Received:
    344
    Location:
    Canada
    Me. 103,
    If you want to avoid Kitfox-type hassles (removing turtle deck fairing and disconnecting flaps) take a close look at the Luton Major.
    Luton Major is a 1930s-vintage British design that mounts wings on top of the cabin roof and the turtle deck is narrow enough to not interfere with flaps.
    Luton Major fold geometry also allowed wing tips to rest on top of the horizontal stabilizer.
    Luton Major plans were sold in North America by Falconar as the “Cub Major.”
     
  7. Oct 7, 2019 #7

    103

    103

    103

    Well-Known Member

    Joined:
    May 3, 2015
    Messages:
    136
    Likes Received:
    75
    Location:
    Wauwatosa WI

    Yes fortunate the cub major plans remain available under new management. Looks like a candidate for a Corvair engine.

    http://cubmajor.com/

    Good looking airplane
    https://forum.flyinginireland.com/viewtopic.php?t=9129

    Vintage film

     
    fly2kads likes this.
  8. Oct 7, 2019 #8

    henryk

    henryk

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,732
    Likes Received:
    458
    Location:
    krakow,poland


    =orginal,interesting wing fold system ! (1949 !!!)
     
    bmcj and fly2kads like this.
  9. Oct 8, 2019 #9

    Tony Spezio

    Tony Spezio

    Tony Spezio

    Active Member

    Joined:
    Sep 19, 2019
    Messages:
    31
    Likes Received:
    24
    Few photos of my Tuholer folding wing setup Remove strut bolt and rear spar bolt. Rotate and fold back to wing support.
     

    Attached Files:

    proppastie, 103, fly2kads and 2 others like this.
  10. Oct 31, 2019 #10

    ToddK

    ToddK

    ToddK

    Well-Known Member HBA Supporter

    Joined:
    Jan 13, 2016
    Messages:
    191
    Likes Received:
    77
    Location:
    Humble
    Here is a picture of the Cub Major/Luton Major with its wing folded. It is not necessary to disconnect the flight controls like it is on a kit fox or many other airplanes, just fold up a hinged fairing over the rear of the cabin, pull a pin from the front of each wing and fold them back.
     

    Attached Files:

  11. Nov 1, 2019 #11

    103

    103

    103

    Well-Known Member

    Joined:
    May 3, 2015
    Messages:
    136
    Likes Received:
    75
    Location:
    Wauwatosa WI
    The Luton Major was ahead of it's time for wing folding taking full advantage of the tandem seating. Plans remain available http://cubmajor.com/
     
  12. Nov 1, 2019 #12

    Winginitt

    Winginitt

    Winginitt

    Well-Known Member

    Joined:
    Apr 5, 2019
    Messages:
    176
    Likes Received:
    47
    One thing to think about when you see a design you like is that most of these quick fold demos probably don't have any fuel in the wing tanks while doing the demo.
     
  13. Nov 2, 2019 #13

    Dana

    Dana

    Dana

    Super Moderator Staff Member

    Joined:
    Apr 4, 2007
    Messages:
    8,688
    Likes Received:
    3,064
    Location:
    CT, USA
    Most of these quick fold planes don't have wing tanks. Kitfox does, though, and it presents no problems
     
    Topaz likes this.
  14. Nov 2, 2019 #14

    Victor Bravo

    Victor Bravo

    Victor Bravo

    Well-Known Member

    Joined:
    Jul 30, 2014
    Messages:
    6,228
    Likes Received:
    5,037
    Location:
    KWHP, Los Angeles CA, USA
    I have experience with the Kolb, and it folds down to the narrowest and smallest floor space footprint of any folding mechanism. It is not quite the simplest (you do have to disconnect two pushrods, and the tail folds) but it is definitely able to store in the narrowest corridor. You can put a Kolb in a single car garage... next to the car.

    The Sky Raider and Ridge Runner (two Avid Flyer derivatives) use the same Avid method (of direct rearward folding with the struts attached), but the tandem seating allows a narrow rear turtledeck that makes them narrower than an Avid.
     
  15. Nov 2, 2019 #15

    Tony Spezio

    Tony Spezio

    Tony Spezio

    Active Member

    Joined:
    Sep 19, 2019
    Messages:
    31
    Likes Received:
    24
    Did I post This,Two bolts and quick disconnect on one aileron cable. Wing pivots on frint spar and folds back.
     

    Attached Files:

    Victor Bravo likes this.
  16. Nov 2, 2019 #16

    pictsidhe

    pictsidhe

    pictsidhe

    Well-Known Member

    Joined:
    Jul 15, 2014
    Messages:
    6,980
    Likes Received:
    1,926
    Location:
    North Carolina
    Folded length and width in feet and inches?
     
  17. Nov 2, 2019 #17

    Topaz

    Topaz

    Topaz

    Super Moderator Staff Member

    Joined:
    Jul 30, 2005
    Messages:
    13,873
    Likes Received:
    5,483
    Location:
    Orange County, California
    Presuming that control connection is fully automatic, and that the disconnect is, essentially, a single pin for each wing, what's the feeling about detachable wings versus folding?

    Sailplanes almost universally have detachable wings, yet powered aircraft generally go for foldable. The dichotomy is curious.
     
  18. Nov 2, 2019 #18

    Dana

    Dana

    Dana

    Super Moderator Staff Member

    Joined:
    Apr 4, 2007
    Messages:
    8,688
    Likes Received:
    3,064
    Location:
    CT, USA
    My Ultrastar folded to something less than 24" wide in the back, in the front the landing gear was the widest thing, it just fit in what I think was a 50" wide trailer. Length maybe 20', don't recall for sure.
     
    pictsidhe likes this.
  19. Nov 2, 2019 #19

    Vigilant1

    Vigilant1

    Vigilant1

    Well-Known Member Lifetime Supporter

    Joined:
    Jan 24, 2011
    Messages:
    4,160
    Likes Received:
    1,884
    Location:
    US
    Is one factor the "community activity vs solo activity" issue? When the sailplanes folks are active, it seems there are lots of them about, it is no big inconvenience to find someone to help move a detachable wing (somebody is already there running the cable, etc). It's different for a powered plane pilot who just wants to go to the airport himself and fly for a few hours, or leave on a long trip as the sun comes up at a deserted airport.
    It doesn't need to be either/or. The Thatcher CX4 wings are removable, but you can fit a nifty little fixture to the top of the wing that holds the wing root after the spar is pulled out, and allows the wing to be pivoted LE down and then folded alongside the empenage. It turns it into a folding wing with one-person rigging/ derigging done from the wingtip.
     
  20. Nov 2, 2019 #20

    Hot Wings

    Hot Wings

    Hot Wings

    Well-Known Member HBA Supporter

    Joined:
    Nov 14, 2009
    Messages:
    6,448
    Likes Received:
    2,360
    Location:
    Rocky Mountains
    Kind of along my lines of thinking. With the attached wing you have a built in assistant to control the other end of the wing. Important when trying to rig the plane in wind. Even the sailplane guys build rigs to help with the wing handling. Kind of hard to haul those rigs with the plane so the need to return to the starting point increases.
     

Share This Page



arrow_white