ORIGINAL: Johng
Hmm, in my reply, I was only thinking in terms of having the airfoil section on paper and determining where on the airfoil the chord line runs. This has no relation at all to sweep or taper. I may have missed the intention of the original question
Normally, the wing is designed with the airfoil section (and thus the chord line) parallel to the centerline, regardless of wing planform. Sorry for any (my) confusion.
John,
Yes, Ed and I should have specified PLAN view. The origin of this query lies in the pylon forums. Over there we are debating the AMA Q500 rules and whether a wing that is swept can or cannot be considered "constant chord".
Thanks for your help!