Hi John

One correction both wings are constant core the upper wing is swept back at about 10 deg's. with both wings on and using a square on the thrust /center line fwd to aft the come bind cord is right at 18 inches at the fuse, But when looking at it as you have discribed the 25 % point seams to be farther back.

Will try to post more pic,s this afternoon but today is honneydue day I am sure you know what I meanbut will post as sone as I can.
well it it off to work for now.

Cheers Bob T
AMA13377