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Thread: Supercub Tail Feathers

  1. #1

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    Supercub Tail Feathers

    I am getting a set of PA-18 tail feathers ready for my PA-12. I bought an extra PA-12 parts plane with supposed Supercub tail feathers, but my PA-18 elevators won't fit on the horizontal stabalizers that came with the parts plane. The parts plane was a floatplane, did they call for something bigger on the tail section? Could someone give me the dimensions of their Supercub tail feathers? Especially the hinge pin distances.
    Thank you, George

  2. #2
    www.SkupTech.com mike mcs repair's Avatar
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    Supercub Tail Feathers

    Search drawings at http://www.supercubproject.com top left is link

    You probably have unbalanced 12 ones that were converted to balanced by cutting and welding


    Sent from my iPhone using SuperCub.Org

  3. #3

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    Or some tripacer tail feathers have been passed off as SC tail feathers.
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  4. #4

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    Thanks, I'm thinking PA-22 feathers or I read in another thread that the PA-18-90hp had smaller tail feathers. So I guess the guy that sold them to me might have been right about them being Supercub tail feathers...

  5. #5
    Steve Pierce's Avatar
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    J3, PA11, PA12, PA16 and PA18-90 all had the same unbaanced tail feathers. PA20 and PA22 balanced tail feathers are about 8-10" shorter each side than PA18 balanced tail feathers.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  6. #6
    Colorguns's Avatar
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    Can I use 20-22 balanced on a -12 for 150hp upgrade or do I have to use -18 tail?
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  7. #7
    Farmboy's Avatar
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    Doug means....legally. For a Friend. Really.


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    algonquin's Avatar
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    Doug there was a thread on here about that and how effective the PA22 tail vs the PA18. If I remember right someone said it didn’t make much difference . I bought the Sullivan STC for a 18 tail, never saw a STC for the 22. There is also a STC for squared off controls from Sullivan but after you pay for the STC he won’t give you the drawings or measurements, sends you to Dodge who sell them. Kind of a underhanded deal, lowered my opinion of Mr. Sullivan.
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  9. #9

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    I used to fly a 150 hp PA-12 with stock tail feathers. Elevator was a little heavy but not uncomfortable. I don’t remember what STC was used for the engine installation.


    Sent from my iPad using Tapatalk

  10. #10
    Hardtailjohn's Avatar
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    Here's the size difference between PA-18 and PA-22 tail feathers. Not my picture, but stolen from faceplant.
    Click image for larger version. 

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  11. #11

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    Wow, That looks like about 12 inches difference
    .

  12. #12
    skywagon8a's Avatar
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    Quote Originally Posted by Colorguns View Post
    Can I use 20-22 balanced on a -12 for 150hp upgrade or do I have to use -18 tail?
    Quote Originally Posted by Hardtailjohn View Post
    Here's the size difference between PA-18 and PA-22 tail feathers. Not my picture, but stolen from faceplant.
    Click image for larger version. 

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    Before you entertain the idea of using a -22 tail on a -12 or -18, consider this by Raoul Hoffman in 1936. "The size of the horizontal and vertical tail area is influenced by the characteristics of the wing section, the location of the center of balance (CG), the characteristics and location of the tail area, and the downwash from the main wing."
    The -22 has a shorter fuselage arm as well as a shorter span, less area wing than a -12 or -18. Just bolting on a smaller tail because it has balanced surfaces is not the answer. There are other considerations.
    N1PA
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  13. #13
    Steve Pierce's Avatar
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    The PA20/22 tail feathers are the same width as the tail on the J3, PA11, PA12 and PA18-95. There is an STC for the balnced PA20/22 tail feathers on the PA11. Got a field approval for them on a PA18-95. Made a huge difference in the heavy feel on the 90 hp Super Cub when slow and also felt like it gace more elevator authority that we lost when we moved the battery under the front seat. I pesonally prefer the battery/CH aft.
    Steve Pierce

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  14. #14
    skywagon8a's Avatar
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    You did well getting a field approval. The way I read this: https://fsims.faa.gov/wdocs/other/ma...b-aid%20r5.pdf on page 13 is, that would require engineering and an STC.
    I do agree that changing to a balanced elevator would lighten the control pressures. The legal mechanism to do so is in question.
    N1PA

  15. #15
    Steve Pierce's Avatar
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    Quote Originally Posted by skywagon8a View Post
    You did well getting a field approval. The way I read this: https://fsims.faa.gov/wdocs/other/ma...b-aid%20r5.pdf on page 13 is, that would require engineering and an STC.
    I do agree that changing to a balanced elevator would lighten the control pressures. The legal mechanism to do so is in question.
    Yes, back long before that document came out and my PMI had GA experience and common sense.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  16. #16
    algonquin's Avatar
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    From a fellow PA-12 builder, I’ve found there really isn’t any short cut building them. By far easier to just get ready to spend the money and not chase around trying to save and get the same results. The 12 in most cases isn’t the best investment for return on your money, the 18 is the much better investment. A lot of guys have tried all these thing, including myself and ended up biting the bullet and going with a STC on the PA -18 tail.

  17. #17
    hotrod180's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    .....and my PMI had GA experience and common sense.
    Unfortunately, this is apparently becoming the exception rather than the rule.
    Cessna Skywagon-- accept no substitute!
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  18. #18

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    Thank you everyone for you advice and comments on Super Cub tail feathers.
    I ordered two new PA-18 horizontal stabs and elevators from F. Atlee Dodge...

  19. #19
    Stew's Avatar
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    Bit late in the day but just looked at possibly some relevant drawings, PM me with an email if you want the .pdf sent over

    Kind regards

    Stew
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  20. #20

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    Thanks Stew, I already found and downloaded these pdf's. They confirmed what I read on this thread about my tail feathers...

  21. #21

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    "The Award Winning"(Dam Sizemore)Steve Pierce comes thru again! great insight my friend!

    I wouldn't want anything but PA-18 tail feathers on a PA-12 they are nose heavy anyway you do it. Buy the PA-18 feathers and sleep well at night knowing your plane is safe and compliant. These planes see too much backcountry time to play around with anything funky! i would think a forward slip with PA-22 feathers "could" get interesting in a hurry, maybe not but why risk it!
    I spent most of my dough on booze, broads and boats and the rest just wasted ! - Elmore Leonard
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