Results 1 to 14 of 14

Thread: Extending Flap Cord

  1. #1
    DJ's Avatar
    Join Date
    Jan 2009
    Location
    Bolivia
    Posts
    320
    Post Thanks / Like

    Extending Flap Cord

    I don't see PSTOL flaps in my future but I'm curious about the low buck way to extend flap cord for a little more drag. Any special tricks? Bend some .020 2024 aluminum and blind rivet to the trailing edge of the flaps? Has anybody experimented with the benefits. I see Loni H used to have this mod.
    The heavens declare the glory of God; the skies proclaim the work of His hands. Psalms 19:1

  2. #2

    Join Date
    Oct 2012
    Posts
    4
    Post Thanks / Like
    I used flap gap seals. Gives about two inches and a cuff. With 70 degrees of flap it works surprisingly well without the extra 12 lbs or eight thousand.
    Likes Dave Calkins liked this post

  3. #3
    DJ's Avatar
    Join Date
    Jan 2009
    Location
    Bolivia
    Posts
    320
    Post Thanks / Like
    What part of the system is easiest to tweak for more flap travel? I have 3 notches 20, 35, 50.

    Sent from my SM-G965U1 using SuperCub.Org mobile app
    The heavens declare the glory of God; the skies proclaim the work of His hands. Psalms 19:1

  4. #4

    Join Date
    Oct 2012
    Posts
    4
    Post Thanks / Like
    I extended the connecting arm on the flap handle but make shure it's strong there's a lot of pull on that flap cable especially when pulled above 50. You can also do the custom bellcrank but I think that's more work.
    Thanks LMartin thanked for this post

  5. #5
    Farmboy's Avatar
    Join Date
    Jan 2016
    Location
    Glens Falls, NY
    Posts
    2,709
    Post Thanks / Like
    https://madcustomcubs.com/product/fowler-flaps/


    Sent from my iPhone using SuperCub.Org
    Thanks BC12D-4-85 thanked for this post

  6. #6
    BC12D-4-85's Avatar
    Join Date
    Feb 2016
    Location
    Fairbanks, AK.
    Posts
    2,889
    Post Thanks / Like
    Hmmmm. Interesting.

    Gary
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_0466-scaled.jpg 
Views:	93 
Size:	59.3 KB 
ID:	56048   Click image for larger version. 

Name:	IMG_0607-rotated.jpg 
Views:	81 
Size:	76.9 KB 
ID:	56049  
    Attached Images Attached Images  

  7. #7
    DJ's Avatar
    Join Date
    Jan 2009
    Location
    Bolivia
    Posts
    320
    Post Thanks / Like
    I like that idea. Doug Keller's Husky cub had something like that going on and obviously Doug knows what he is doing. I already try to limit my flap extension to below 65 mph. I'd be willing to back that down some more for a Fowler flap.
    What is the best way to attach the extended trailing edges over the stock ones on a covered Cub? I'm picturing cherry max rivets.

    Sent from my SM-G965U1 using SuperCub.Org mobile app
    The heavens declare the glory of God; the skies proclaim the work of His hands. Psalms 19:1

  8. #8
    Olibuilt's Avatar
    Join Date
    Nov 2009
    Location
    Montreal, Canada
    Posts
    894
    Post Thanks / Like
    Quote Originally Posted by DJ View Post
    What part of the system is easiest to tweak for more flap travel? I have 3 notches 20, 35, 50.

    Sent from my SM-G965U1 using SuperCub.Org mobile app


    Extended flap bellcrank:

    https://store.tk1racing.com/ProductDetails.asp?ProductCode=201%2D68




  9. #9
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    20,929
    Post Thanks / Like
    TK1 Racing/Monster Shocks makes a longer bellcrank for the wings for Experimental.

    I was looking for a link while Olibuilt was posting. There ya go.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  10. #10
    DJ's Avatar
    Join Date
    Jan 2009
    Location
    Bolivia
    Posts
    320
    Post Thanks / Like
    Thanks for the great feedback.

    Sent from my SM-G965U1 using SuperCub.Org mobile app
    The heavens declare the glory of God; the skies proclaim the work of His hands. Psalms 19:1

  11. #11

    Join Date
    Oct 2012
    Posts
    4
    Post Thanks / Like
    I would use pk screws while you experiment with different chords 2inch 3inch 4inch cuff no cuff and once you come up with what you like cherry rivet. Try it it's fun experimenting with different chords and flap settings. I'm certified so pk screws so I can take them off now and then.

  12. #12
    DJ's Avatar
    Join Date
    Jan 2009
    Location
    Bolivia
    Posts
    320
    Post Thanks / Like
    When you say cuff I'm picturing a downward curve at the trailing edge. Sorta gurney flapish?

    Did the simple flap lever mechanism mod get you to 70 degrees?
    The heavens declare the glory of God; the skies proclaim the work of His hands. Psalms 19:1

  13. #13

    Join Date
    Oct 2012
    Posts
    4
    Post Thanks / Like
    Quote Originally Posted by DJ View Post
    When you say cuff I'm picturing a downward curve at the trailing edge. Sorta gurney flapish?

    Did the simple flap lever mechanism mod get you to 70 degrees?
    Yes and yes. I use flap gap seals because it's easy ready to go with exact width and already bent with a cuff. But you might want to experiment with straight chords and maybe longer l have seen 4 inches with straight cord.

  14. #14

    Join Date
    Sep 2003
    Location
    Valdez, Alaska
    Posts
    672
    Post Thanks / Like
    Quote Originally Posted by deltaj View Post
    Yes and yes. I use flap gap seals because it's easy ready to go with exact width and already bent with a cuff. But you might want to experiment with straight chords and maybe longer l have seen 4 inches with straight cord.
    I extended my cord of my flaps by 2.5" WITH GOOD RESULTS...also extended inboard...exp PA12ish

Similar Threads

  1. Extending the flap cord
    By DW in forum Member to Member
    Replies: 3
    Last Post: 02-12-2008, 09:07 PM
  2. What is the best STC for extending a cub wing
    By ksecub in forum Modifications
    Replies: 2
    Last Post: 11-09-2003, 09:02 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
  •