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Thread: IV fuselage repair - measurements

  1. #1
    motortommy's Avatar
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    Default IV fuselage repair - measurements

    I have a crashed and repaired fuselage. Although the plane has been in service flawlessly for years since then, I don`t like the workmanship of previous owner. Welding is awful, no splices and metric tubes were used. Further additional `improvements´ were made
    Goal is to get the fuselage back in original state as much as possible referring to AC43.13

    1. What is correct tube size (green) of the longerons. OD is 1/2", but unsure about wall?
    2. Does anybody have a bare, undamaged IV fuselage handy and could help me with some measurements in case? No rush!

    fuselage01.jpgfuselage02.jpg
    Marc
    rebuilding IV-1200
    `Kitfox fifty`

  2. #2
    patrick.hvac's Avatar
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    Default Re: IV fuselage repair - measurements

    I can tell you that the model 5-7 in that location is .5" OD and .050 wall.
    🇨🇦CANADA
    Flying | SS7 | G3X | Edge 912

  3. #3
    Senior Member 109JB's Avatar
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    Default Re: IV fuselage repair - measurements

    On a Kitfox IV they are 0.035" wall thickness.
    John Brannen
    Morris, IL
    Sonerai IIL (Single Seat)
    Kitfox 3/4 1050 - Rotax 582 (Back Flying and sold)
    Kitfox IV 1050 - Rotax 582 (sold)
    Kitfox IV 1200 Speedster - Rotax 912 UL (project)
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  4. #4
    motortommy's Avatar
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    Default Re: IV fuselage repair - measurements

    Thanks!
    Unfortunately 4130 tubing is sold out at the moment (Germany)...have to wait.

    Like more pics? Here is the bent mess...
    fuse3.jpg fuse4.jpgfuse5.jpg
    previous repairman added triangle braces and steel stringers side and bottom, maybe to strengthen his welding skills
    Marc
    rebuilding IV-1200
    `Kitfox fifty`

  5. #5
    LuckyFox's Avatar
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    Default Re: IV fuselage repair - measurements

    Quote Originally Posted by 109JB View Post
    On a Kitfox IV they are 0.035" wall thickness.

    Is this the wall thickness of the tubing used on the vertical stabilizer as well? I would like to add height to my IV.

    Robert

  6. #6
    motortommy's Avatar
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    Default Re: IV fuselage repair - measurements

    anybody out there with a genuine (not crashed) fuselage?
    I want to replace some parts of the lower longerons due to improper repair. Questions:
    - are the longerons one piece till the tail?
    - is the longeron shape gently bowed (like #1) below or is the longeron divided in sections with straight tubes angled (like#2)
    Hope you got what worries me...

    fuse_long.jpg
    2021-09-27 12_09_34-Window.jpg
    Marc
    rebuilding IV-1200
    `Kitfox fifty`

  7. #7

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    Default Re: IV fuselage repair - measurements

    Marc:
    Lower longerons are like #1, curved.
    I have a Model IV fuselage that is not yet built from an unstarted kit. I can get you specific measurements.IMAG2155.jpg

  8. #8
    motortommy's Avatar
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    Default Re: IV fuselage repair - measurements

    Hi Mark,
    thanks for reply and pic. Could be that I will bother you with some measurement requests
    Marc
    rebuilding IV-1200
    `Kitfox fifty`

  9. #9

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    Default Re: IV fuselage repair - measurements

    Quote Originally Posted by motortommy View Post
    Hi Mark,
    thanks for reply and pic. Could be that I will bother you with some measurement requests
    Please do, the fuselage is out and easy to access. Happy to help.

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