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Thread: Mackey Slats installation info

  1. #1

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    Mackey Slats installation info

    Hello guys,
    can somebody with Mackey Slats tell me how much the slats should be open in the maximum opening position? as I have to make a hole for the opening limit and I can not find the paper with the instruction. I think it was about 2" or 2.5" open but I am not sure.

    Thank you in advance for your help!.

  2. #2
    stewartb's Avatar
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    There should be stops in your hangers.
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  3. #3

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    Quote Originally Posted by stewartb View Post
    There should be stops in your hangers.
    Hi Stewart. They did not come with the wholes.




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  4. #4
    stewartb's Avatar
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    If nobody answers first I’ll be home tonight and can take whatever measurements you need. Here are a couple of pics. We modified a couple of stops to allow gust locks at each slat. Highly recommended!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by stewartb; 12-01-2021 at 01:19 PM.
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  5. #5
    Colorado-Cub's Avatar
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    I have been asking this same question for years.

    Anecdotal evidence suggests a 7-to-1 intake-to-exit (which comes out to ~2.5" gap between the rear of the slat and the top of the wing), but the placement of the slat in relation to the wing bottom also seems to influence the effectiveness of the slat.

    The slat hanger stop looks similar to this, and I believe some generations of the slat hanger did not come with pre drilled holes for the stop bolt:

    Click image for larger version. 

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    (thanks to Ted for letting me take 1 million detailed photos over the years of my favorite airplane of all time)
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  6. #6
    Colorado-Cub's Avatar
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    Example of a hanger supplied without a stop hole pre-drilled:

    Click image for larger version. 

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  7. #7
    stewartb's Avatar
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    Mike probably drilled mine when I was on a different task. Where the stops are located will be determined by where you locate the slat leading edge relative to bottom of wing.
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  8. #8

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    I got the answer from Jane Bryson from Backcountry Super Cubs, the number is 2 7/8”.


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  9. #9
    stewartb's Avatar
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    Level with the wing or are you going lower?

  10. #10

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    The instructions say:

    After you have completed screwing all the brackets down, cut a few pieces of wood 2 7/8" (2.875) thick. Place them under the trailing edge of the slat. This will set how much the slats can open.
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  11. #11

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    Level with the wing
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  12. #12
    stewartb's Avatar
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    Get ready to smile.
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  13. #13
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    What do the slats cost?

  14. #14

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    This is from the instructions with the set I installed.

    "After you have attached all of your hangers you need to locate the stops. The stops only allow the slat to rotate upward 1 ¾”. This means you will want to cut a few pieces of wood 1 ¾”” thick. Set the wood blocks between the leading edge skin and the trailing edge of the slat. Then you are going to hold the smallest bushing that came with the slats in the stop position as seen in the photos. Using the nylon bushing as a template, drill through the bushing center and through the hanger arm. Install these stops with the screws provided."

  15. #15

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    Quote Originally Posted by jimboflying View Post
    What do the slats cost?
    https://www.supercub.org/forum/showt...633#post795633
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  16. #16
    stewartb's Avatar
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    Interesting. Mine open 2-7/8”. I just measured them.

    3-4 years ago a slat kit was $4K from Backcountry Supercubs. No idea what they are these days. Carbon Concepts sells a CF slat kit now, too.
    Last edited by stewartb; 12-02-2021 at 09:01 AM.
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  17. #17
    jimboflying's Avatar
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    Are slats of any benefit in float operations?

  18. #18
    stewartb's Avatar
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    I’d sure like to try my Cub on floats, but there’s a lot more to it than just slats. I’d also like to try a mostly stock Cub with the AOI increased a few degrees on floats. I think that would be better than slats on an otherwise standard wing.

  19. #19

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    Quote Originally Posted by stewartb View Post
    Get ready to smile.
    Thank you Stewart, as always


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  20. #20
    Olibuilt's Avatar
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    Mine also open 2-7/8”.

  21. #21
    Colorado-Cub's Avatar
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    Oli, have you ever pinned your slats open to determine how much a non-movable slat impacts your cruise speeds?

  22. #22
    Olibuilt's Avatar
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    Quote Originally Posted by Colorado-Cub View Post
    Oli, have you ever pinned your slats open to determine how much a non-movable slat impacts your cruise speeds?
    No. Not in flight yet..

    But I tough to pinned them close to see if it fly faster. But after trying to close them by hand in strong wind, I was afraid the mounting brackets would break with only one pin per wing. A guy in Canada used to fly with 1 pin per wing without any issues...

  23. #23
    gpepperd's Avatar
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    I pinned my slats shut in flight but I used bolts at each bracket. Thought it gave me about 2-3 mph. Not enough difference for an hour flight. Like the safety factor more than that.
    Good judgment comes from experience, and a lot of
    that comes from bad judgment. will rodgers

    "Anyone who would give up liberty for safety deserves neither" Ben Franklin
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  24. #24
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    Quote Originally Posted by gpepperd View Post
    I pinned my slats shut in flight but I used bolts at each bracket. Thought it gave me about 2-3 mph. Not enough difference for an hour flight. Like the safety factor more than that.
    That is really interesting. I always assumed that in normal low AoA flight the slats were essentially pinned against the top of the wing (closed position) by the relative wind. If you saw an improvement by pinning closed, something else is going on there.

    I can see how a slat pinned open would lead to a decrease in cruise speeds, but not the inverse. Have you ever noticed your slats fluttering at the close-stop a bit during cruise? (which might explain how pinning them closed would lead to a speed increase?)

  25. #25
    Olibuilt's Avatar
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    Never noticed any kind of flutter.

    My slats fully close only when diving at high speed or momentary close in bumpy air, 2 things I try to avoid...


    They are about at 1 inch to be closed when flying at cruise speed.

  26. #26
    stewartb's Avatar
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    In 100 mph cruise my slats are partially open. Not a lot, but I can see light from under the slat trailing edges. .
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  27. #27
    Colorado-Cub's Avatar
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    Quote Originally Posted by Olibuilt View Post
    Never noticed any kind of flutter.

    My slats fully close only when diving at high speed or momentary close in bumpy air, 2 things I try to avoid...


    They are about at 1 inch to be closed when flying at cruise speed.
    No kidding? I had no idea.

    I watched the lower edge of a slat from the backseat of an SQ2 from the lower 48 all the way to AK, but couldn't tell from my angle if the darn thing was floating or not. Super helpful info!
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  28. #28

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    The set I installed stay open about 1", never noticed any flutter over the 25 hours I flew it.

  29. #29
    stewartb's Avatar
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    Huh. I would estimate mine open up to 1/4”. Probably less than that. But my Cub also cruises with the tail higher than most. I’d think flight attitude would matter. Location of the slats relative to wing LE, too.
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  30. #30

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    Definitely position sensitive, the instructions I had were less than vague as to the correct position.

    "You will also see that each hanger fits over the leading edge skin and rest best in a certain attitude. When drilling each hanger make sure each one is rotated into the same attitude."
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  31. #31
    stewartb's Avatar
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    The instructions from Backcountry have said to install slats level with the bottom of the wing for several years. I know guys who have them lower but say any improvement is subtle, and it would have to affect cruise speed. I spoke with Bruce Reed about it to explore my best option. He told me level. So they are.

    For guys who are wondering, both of the attach feet on slat hangars pivot so they lay flat against the leading edge. That allows mounting them in different places.

  32. #32

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    Ok gang, I have to ask. Been on this site for awhile and have read a lot of stuff but still have never seen it in print anywhere and have wondered about it…..maybe I just haven’t looked hard enough at the right posts, however…..
    Who does a person call or get on a website to buy a set of these slats? It just seems to be common knowledge among some (or most?) but I’ve just never picked up on it. Sure, I’ve read some names on here but I guess the biggest thing is the contact info. This thread has had the most names within its posts that I’ve seen yet.
    We have: Wayne Mackey, Backcountry, Cub Crafters.
    Anyone else?
    Recommendations one over the other?
    Any other tidbits anyone cares to add is appreciated.
    Sorry for the jumble of questions etc, Maybe I’m the only guy on here that is scratching his head over this.

    Thanks and I appreciate you all greatly for the collective of probably over a thousand years of SuperCub and generally just good practical useful knowledge on here. It’s mind boggling how good it really is and how generously it is shared.

    Best to all,
    Mike
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  33. #33
    stewartb's Avatar
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    Backcountry Supercubs. 1-307-358-5700 or 1-800-862-1276 supercub.com

    Carbon Concepts. (907) 244-7505 carbonconceptsak.com
    Last edited by stewartb; 12-08-2021 at 03:24 PM.
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  34. #34

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    Quote Originally Posted by stewartb View Post
    The instructions from Backcountry have said to install slats level with the bottom of the wing for several years. I know guys who have them lower but say any improvement is subtle, and it would have to affect cruise speed. I spoke with Bruce Reed about it to explore my best option. He told me level. So they are.

    For guys who are wondering, both of the attach feet on slat hangars pivot so they lay flat against the leading edge. That allows mounting them in different places.
    The attach pads on the hangers were fixed (riveted) on the kit I installed, any idea when the change was made? This kit was shipped in 2011.
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  35. #35
    stewartb's Avatar
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    Dangit, my memory was incorrect. The feet on the hangers are fixed. I do recall locating them and they fit nicely moved a little up or down, but the range of interest was pretty small. It would be easy enough to drill out one rivet, adjust, and re-rivet. I figured if I eventually wanted to move the slats I’d make a template and waterjet new hangers using the same attach points on the leading edge. At this point I have no interest in making the effort. They work great as they are.
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    Last edited by stewartb; 12-09-2021 at 10:14 AM.
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  36. #36

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    Quote Originally Posted by stewartb View Post
    Backcountry Supercubs. 1-307-358-5700 or 1-800-862-1276 supercub.com

    Carbon Concepts. (907) 244-7505 carbonconceptsak.com
    Thanks much! That’ll do!

    Mike

  37. #37
    Olibuilt's Avatar
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    Level flight at 85mph at 500'asl




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  38. #38
    Colorado-Cub's Avatar
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    Quote Originally Posted by Olibuilt View Post
    Level flight at 85mph at 500'asl




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    Awesome photo. That is floating open way more than I would have guessed.

    I modeled up the slat hanger for <some> older revision of the BCSC slats a while back with the idea to make a slat hangar that incorporates multiple pivot points to facilitate the testing of slat position in relation to the bottom of the wing. If anyone is every interested in a DXF, just holler.

  39. #39
    stewartb's Avatar
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    Quote Originally Posted by Olibuilt View Post
    Level flight at 85mph at 500'asl




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    Interesting. Mine don't do that. Other's I've observed don't do that, either. You may as well have fixed slots.

    Oli, do you have a photo of your slats and hangers at rest? The slat-to-pivot relationship looks different on yours. Here’s a video I made of my slats open to closed. Notice the leading edge never drops below the pivot. Very different. https://youtu.be/qSifRrG5o8k
    Last edited by stewartb; 12-09-2021 at 06:44 PM.

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