Hi Michael,

Just a quick show of appreciation for when and if such functionality exists in future.

This would be particularly useful for drawing airfoil sections, which are (historically) defined by two lines intersecting given coordinates and a leading edge radius.

Hamish

Michael not sure if you are familiar with Spiro by Raph Levien ...very interestin :0 http://levien.com/phd/LevienSequinCAD09_014.pdf

I wish we could license his library...

Oops my apologies, I should have search the forum before I post...I see Levien's work has been mentioned before.

"""""""""""This would be particularly useful for drawing airfoil sections, which are (historically) defined by two lines intersecting given coordinates and a leading edge radius.""""""""""""""

Do you know that Michael added a "Conic curve" command? he also added an RHO value input to it.... FYI.

Hi Hamish, yup like Burr says try the Conic command for a traditional airfoil curve.

It's available under Draw curve > More > Conic, and it lets you draw 3 points to make a shoulder bracket of 2 intersecting lines, and then either pick a point for the curve to go through or enter a "rho" value.

Some more information here:
http://moi3d.com/2.0/docs/moi_command_reference2.htm#conic

- Michael

Hi adam,

> I wish we could license his library...

Yup, I wish so too, it's pretty cool!

I've tried to contact the author about commercial licensing, and unfortunately it appears that he does not have enough time and/or interest right now to do that.

In the future I want to experiment with some ideas on interpolation with a minimization in curvature changes that may give a kind of similar effect.

- Michael