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  1. #1

    Join Date
    Aug 2012
    Kiefer, OK
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    Cad drawing a wing that has only one straight line

    Hey Gang

    I have drawn a lot in CAD, but I have never drawn a wing before this one, it is a challenge. The wing is for the Cessna T-50/U-78/JRC-1. The LE, TE and bottom of the wing all have angles to the main spar. It has two main spars, the trailing spar also has an angle to the front one. The ribs vary from about 2-1/2 thick at the center to about 3/4 on the outer most rib. And bout 14" from the center to about 8" so the radius on the LE of the ribs is going to be a challenge as it is a symmetrical wing.

    The only straight line on this wing is the LE main spar so that's where I start my work, all the drawings in the plans I have need to be redrawn, nothing about it anywhere in the drawing is correct, I did order a second set of plans of this plane from a second source that has the same problems in the drawing.

    Anyone having CAD experience with any method recommendations I'd appreciate. Otherwise I will just slug it out.


  2. #2

    Join Date
    Oct 2002
    Cincinnati, OH,
    I'm a self-taught amateur with CAD but I did do an eliptical wing for a Val dive bomber. Maybe some of the techniques I used would help. The drawings I have here are pdf files and RCU can't post them. We could discuss by email if you are interested.
    Click image for larger version. 

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  3. #3
    CompuFoil3D would be a good to have use it on all my wings!
    Kits: F11C-2 1:4, Do-24T 1:8, P-3 1:10, H 500 1:5, XFY-1 1:4, SR-9 1:4, V-22 1:6, B-25J 1:4, F+W C3603 1:5, B314 1:11, Projects: 350i King Air 1:4, 156X Beaufighter 1:4, DHC-4 1:10, TBM 1:4

  4. #4
    Lnewqban's Avatar
    Join Date
    Apr 2007
    South Florida



    I would use that straight LE as my reference line.

    The radii of the LE of the ribs will be circles of different diameter, each of those being tangent to the LE line.

    For difficult curved lines, you can use a polyline (doing a succession of small lines) and then using the smooth polyline function.


    Click image for larger version. 

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    Lnewqban - "God will not look you over for medals, degrees or diplomas, but for scars. He has achieved success who has worked well, laughed often, and loved much." - Elbert Hubbard

  5. #5
    soliex's Avatar
    Join Date
    Nov 2012
    Center Point, AL
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    Since everything on/in a wing hangs off the main spar I would draw it in all three axis first and then dimension everything from there.
    Wait for it.......

    Club Saito #797
    FA-50, FA-50GK, FA91S

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