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Cad drawing a wing that has only one straight line

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Old 01-01-2014, 03:38 PM
  #1
oldbassard
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Default 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.


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Old 01-01-2014, 05:01 PM
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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.
Chuck
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Old 01-01-2014, 06:30 PM
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CompuFoil3D would be a good to have use it on all my wings!
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Old 01-01-2014, 09:27 PM
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Cool

Bassard,

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.

Best!

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Old 01-02-2014, 06:32 AM
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oldbassard

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.
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