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Old Mar 28, 2005, 01:14 AM
tsunami is offline
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Converting coordinate data onto cad

im not shure were this would go but i want to know how to convert the dat #'s onto a quick cad file for easy .dxf use. how do i use the numbers to do this?
as an example here is the dat from MArk's AG 36 foil
AG 36
1.000003 0.002671
0.993991 0.003641
0.983912 0.005266
0.972030 0.007181
0.959208 0.009247
0.946050 0.011369
0.932962 0.013479
0.920159 0.015543
0.907668 0.017556
0.895474 0.019522
0.883699 0.021360
0.870771 0.023227
0.857975 0.025012
0.845188 0.026795
0.832275 0.028596
0.819232 0.030415
0.806149 0.032241
0.793050 0.034067
0.779976 0.035891
0.766906 0.037713
0.753833 0.039537
0.740771 0.041359
0.727741 0.043176
0.714758 0.044986
0.701919 0.046776
0.689366 0.048527
0.677377 0.050200
0.664649 0.051879
0.652447 0.053315
0.640918 0.054568
0.628145 0.055906
0.615243 0.057187
0.602241 0.058477
0.589040 0.059787
0.575726 0.061108
0.562405 0.062429
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Old Mar 28, 2005, 09:33 AM
Curtis Suter is offline
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Red Merle ALES
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This may not be exactly the help you're looking for but it works great and is real easy.

The program is awesome, really awesome and for the money you won't find anything else better, it's like $15.

All you do is select the airfoil you want, select export to .dxf, go to your CAD program then select import and you're done.


PS I'm not affiliated with Profili.
Old Mar 28, 2005, 04:32 PM
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ill look into it but i wanted to know if theirs a way to do it without a mid prgram, alos since my pc is already getting cluttered with programs i rarly use, i want ot be able to just sit down and do it for a few hours so i have them in dxf format
Old Mar 28, 2005, 06:14 PM
ScottLister is offline
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Those are just x-axis and y-axis coordinates. Just type them into you cad system as points then create curves or use a polyline to outline the airfoil. When you need it just scale it up to the correct chord length.

Old Mar 28, 2005, 07:52 PM
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i see, thanx ill try it tonight
Old Mar 31, 2005, 03:22 AM
wildshark is offline
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take a look also on RCSD March magazine

Old Mar 31, 2005, 05:34 PM
bgriggs is offline
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Make something. Anything!
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Basically this is how it is done.

The left hand column of numbers are percentages along the airfoil, starting at the trailing edge. The numbers as you see them will allow you to plot a 1" airfoil if you plot them exactly as described.

The numbers proceed along the top of the airfoil to the leading edge (numbers in the left column begin to approach zero) they then proceed bottom of the airfoil towards the trailing edge (numbers in the left column approach 1). To get a bigger airfoil scale the foil up in cad.

Old Apr 13, 2005, 08:37 AM
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My way:

I open table (dat file with airfoil coordinates) in WordPad. I change space between coordinates with comma, using Find&Replace command.
Then I wrote Pline on the top of the first row.
Then I save this file as name of the profile.scr (as txt file)
I open AutoCad.
I close "Osnap" not to be active.
I type the command: Script
I browse to the airfoil file name of the profile.scr
This command will read the data of this scr (script) file and draw a nice airfoil. To smooth the airfoil, you can use "Polyline Edit" command and choose "Fit Curve" option.
Then I scale up (or down) the airfoil to lenght that I will use further, depending of the wing...
Of course, not to forget to save airfoil drawing eather as wg od dxf file type
It is simple and easy solution.

The scr file should look as shown bellow:


Last edited by ultralajt; Apr 13, 2005 at 08:45 AM.
Old Apr 13, 2005, 11:45 AM
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Thanks for the input! I was wondering if there was an easy way to do that with the data file for autocad. I'll give it a try!

Old Apr 13, 2005, 12:23 PM
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wow. that sounds like a much eisier way to do it. thanx, im at school right now so i cant try it maybe at lunch.
Old Apr 18, 2005, 06:11 PM
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O-o hnn, doesnt seem to work with Qcad, Script prompt doesnt start a subsytem, and i tired looking for a way to insert the file with no luck
Old Apr 22, 2005, 08:37 PM
Hogwash is offline
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I think this is what your after.

Its a small free program. It will convert airfoil data to and from many formats.

Ive used it many times to produce DXF etc for Solidworks and Autocad.


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