Results 1 to 7 of 7

Thread: Flap leading edge fab

  1. #1
    jimboflying's Avatar
    Join Date
    May 2005
    Posts
    497
    Post Thanks / Like

    Flap leading edge fab

    What is the best way to prefab the leading edge skins on experimental flaps?

  2. #2
    www.SkupTech.com mike mcs repair's Avatar
    Join Date
    Aug 2004
    Location
    chugiak AK
    Posts
    10,402
    Post Thanks / Like
    buy them.... univair sells blanks

    or you could do it in a sheet metal break, little by little...

  3. #3
    Hardtailjohn's Avatar
    Join Date
    Jan 2007
    Location
    Marion, MT
    Posts
    703
    Post Thanks / Like
    Dakota Cub!
    John
    Likes mike mcs repair, Mark_Moyle liked this post

  4. #4
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    9,354
    Post Thanks / Like
    Fasten two 2x4s to a piece of plywood with the appropriate spacing. Place the flat aluminum on top with the bend centerline in the center of the gap. Then force a piece of plastic pipe of the appropriate size on top of the aluminum down into the slot. Allow for spring back.
    N1PA

  5. #5
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    18,738
    Post Thanks / Like
    The original leading edges are 3003 aluminum and very soft and easy to form. The originals where broken on the leading edge with a roll on the top surface. I have always bought the blanks from Univair, would consider Dakota as well. Not sure but believe they use a better alloy like they do on the spar. I think Pete's way would work well. I have a press break and would use it with the proper radius die, clecoe the bottom and then pull the top around the ribs to form the curve and drill. I made some fixtures to hold the skins while riveting the ribs in. I will get a picture, they were pretty helpful.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
    Likes Hardtailjohn liked this post

  6. #6
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    18,738
    Post Thanks / Like
    Here is the fixture I made out of MDF years ago to hold the skins while drilling and riveting the ribs inside.
    Click image for larger version. 

Name:	IMG_20190103_080822.jpg 
Views:	46 
Size:	58.3 KB 
ID:	40710Click image for larger version. 

Name:	IMG_20190103_080832.jpg 
Views:	35 
Size:	96.5 KB 
ID:	40711Click image for larger version. 

Name:	IMG_20190103_080843.jpg 
Views:	32 
Size:	98.3 KB 
ID:	40712

    Sent from my Pixel 2 XL using SuperCub.Org mobile app
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
    Thanks Lance2050 thanked for this post

  7. #7
    jimboflying's Avatar
    Join Date
    May 2005
    Posts
    497
    Post Thanks / Like
    This is what I wound up doing.
    I slide the correct material between the plywood sheets of my work bench. I then screwed the plywood sheets together to clamp the material securely. I then drilled an aluminum rod of the correct radius for screws and countersunk the holes every 6 inches. I then screwed the rod to the edge of the bench on top of the aluminum sheet. I then clamped boards to the free end of the sheet aluminum which was .025 2024. Then with considerable effort I folded the aluminum around the captive rod clamping it to the table. It took a little persuasion with a mallet on the boards. I did a secondary bend with anotherClick image for larger version. 

Name:	89DCA272-7109-41B1-9C39-7C57548BCC57.jpg 
Views:	24 
Size:	64.2 KB 
ID:	40821 rod placed on top of theClick image for larger version. 

Name:	8F99B971-7C46-40DE-8582-15DEF51FF036.jpg 
Views:	20 
Size:	83.7 KB 
ID:	40822 workbench. The results turned out nice. Click image for larger version. 

Name:	4CEB0677-6308-4226-99A4-578B9FFF1BAE.jpeg 
Views:	28 
Size:	232.0 KB 
ID:	40820
    Thanks Steve Pierce thanked for this post

Similar Threads

  1. Bucking bar for flap leading edge rivets
    By kiwicubber in forum Super Cub Sick Bay
    Replies: 7
    Last Post: 08-18-2017, 03:46 PM
  2. Leading edge
    By STEEL in forum Experimental Cubs
    Replies: 9
    Last Post: 03-15-2017, 06:49 AM
  3. PA-12 leading edge supports
    By uaweasel in forum Tips and Tricks
    Replies: 9
    Last Post: 10-27-2015, 11:28 AM
  4. Leading edge dents
    By oldbaldguy in forum Cafe Supercub
    Replies: 12
    Last Post: 08-22-2007, 10:03 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •