Kitfox Aircraft Stick and Rudder Stein Air Grove Aircraft TCW Technologies Dynon Avionics AeroLED MGL Avionics Leading Edge Airfoils Desser EarthX Batteries Garmin G3X Touch
Page 3 of 4 FirstFirst 1234 LastLast
Results 21 to 30 of 32

Thread: Rear edge stiffeners ?

  1. #21
    Senior Member HighWing's Avatar
    Join Date
    May 2009
    Location
    Goodyear, AZ
    Posts
    1,743

    Default Re: Rear edge stiffeners ?

    The scalloping was not intentionally done, but was a result of the thin aluminum trailing edge structures inability to restrain the shrinking forces of the fabric. Standing at the wingtip and sighting down the trailing edge, you could see a slight inset between each wing rib tip.
    Lowell Fitt
    Goodyear, AZ


    My You Tube Channel

  2. #22
    Senior Member efwd's Avatar
    Join Date
    Jun 2015
    Location
    Yorba Linda, CA
    Posts
    2,817

    Default Re: Rear edge stiffeners ?

    Harlan, are you speaking of the scalloped trailing edges of the Laker Leading Edge fiberglass?
    Eddie Forward
    Flying
    SS7, 912iS, Garmin G3X

  3. #23
    Senior Member Kitfox Pilot's Avatar
    Join Date
    Aug 2019
    Location
    Spring Garden Illinois
    Posts
    859

    Default Re: Rear edge stiffeners ?

    Yes that's what I was referring . I misunderstood the previous poster.
    Harlan and Susan Payne
    Sold Piper Archer
    Flying FarmFox STI Kitfox N61HP
    Rotax 915is, Airmaster prop
    https://www.youtube.com/channel/UC5A...oCVUP15G0uB-Yw

  4. #24
    Senior Member Delta Whisky's Avatar
    Join Date
    Dec 2017
    Location
    Amissville, VA
    Posts
    637

    Default Re: Rear edge stiffeners ?

    Harlan - the opening (for the reinforcing aluminum tube) in my trailing edge was not large enough to manage the size of tubing the manual recommends. I bought a smaller size of 6061 T6 and used it.

  5. #25
    Senior Member Kitfox Pilot's Avatar
    Join Date
    Aug 2019
    Location
    Spring Garden Illinois
    Posts
    859

    Default Re: Rear edge stiffeners ?

    Thanks for that heads up.
    Harlan and Susan Payne
    Sold Piper Archer
    Flying FarmFox STI Kitfox N61HP
    Rotax 915is, Airmaster prop
    https://www.youtube.com/channel/UC5A...oCVUP15G0uB-Yw

  6. #26
    Senior Member jrevens's Avatar
    Join Date
    Aug 2009
    Location
    Arvada, CO
    Posts
    2,146

    Default Re: Rear edge stiffeners ?

    Mine might have been a little different than Delta Whisky, but I originally thought the tubing wouldn’t fit properly also. However, I found that with the proper “rolling” technique it would pop into place nice and tightly, although I still used Hysol to really secure it.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  7. #27
    Administrator DesertFox4's Avatar
    Join Date
    Aug 2008
    Location
    Arizona
    Posts
    3,562

    Default Re: Rear edge stiffeners ?

    I used the aluminum tubes bonded into the trailing edges in my 7SS. No "scalloping" when shrinking the PolyFiber. Slightly heavier than the carbon rods some use but less chance of galvanic corrosion issues than between the aluminum tailing edge pieces and the carbon fiber. Those near the coasts might consider this type of corrosion with regards to sea water and the reaction between these two materials.
    Not an "expert" on corrosion issues but read enough to decide to pass on the carbon fiber rods buried in the trailing edges with no way to inspect for corrosion issues.
    Not a quick or simple fix if corrosion does get a foothold in the trailing edges. Anyway, food for thought. I do love carbon fiber but where I can see and inspect it.


    DesertFox4
    Admin.
    7 Super Sport
    912 ULS Tri-gear


  8. #28
    Senior Member bbs428's Avatar
    Join Date
    Jan 2015
    Location
    SW Missouri
    Posts
    649

    Default Re: Rear edge stiffeners ?

    Interesting. I did a search and found in a salt water environment the corrosion can be significant.

    "When Eurocopter started to mix carbon composite and aluminum in their helicopters structure and these machines were flown in the North Sea for the oil rig... Within a few weeks they had holes (you read right: holes) starting to develop. If I recall correctly it was less than 2 months!
    If you do an Internet search you will find all of this well documented and some people involved with fixing these problems are still today very negative regarding aluminum and carbon.
    Nevertheless, it is possible to mix the two with some good design, engineering and care."

    Food for thought...
    Somebody said that carrier pilots were the best in the world, and they must be or there wouldn't be any of them left alive. — Ernie Pyle

    Brett Butler
    Flying: 1998 Model 5 Outback, 912ul Zipper 110hp, G3x avionics, ss7 upgrades

  9. #29
    Senior Member
    Join Date
    Apr 2010
    Location
    Bryan, Texas
    Posts
    558

    Default Re: Rear edge stiffeners ?

    Anyone know the size of this tubing 3/8" OD? What about wall thickness?

    Thanks.

  10. #30
    Senior Member Dave S's Avatar
    Join Date
    Oct 2008
    Location
    St Paul, MN
    Posts
    1,833

    Default Re: Rear edge stiffeners ?

    Jerry,

    The length can be measured between the ribs. The instruction, which are buried as a Note under the wing covering section say tubing wall thickness of 0.028" to 0.035". I used the 0.035" as the difference in weight is almost irrelevant (like eating 1/2 a bagel less for breakfast); and, once the tubes are bonded in, nobody is going to take them out and replace them after covering if they change their mind. No problem with bending with max shrink on the 0.035" wall thickness tubes.
    Dave S
    Kitfox 7 Trigear (Flying since 2009)
    912ULS Warp Drive

    St Paul, MN

Posting Permissions

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