The inaccuracies that proliferate in this wing are largely a result of a worn out drafting machine used by the person that drew this plan. While I can compensate for them once discovered, it has been time consuming and a lot of work to say the least. If I were starting the wing from the beginning I would employ the aid of a clever CAD tool I just discovered to draw and print the wing ribs. It's called Profili 2 and heres the link:[link]http://www.profili2.com/eng/default.htm[/link]

Before you groan about a steep learning curve, forget it. This software is so intuitive and, frankly brilliant, that I had the whole Duelist wing laid out and a rib schedule, complete with lightening holes and built in tabs to aid in building, within an hour. I didn't even need to refer to the help section! After struggling with my 500 page TurdoCAD manual that was refreshing.

I've just begun working with Profili 2 but already anticipate a whole new world of design possibilities. The software is specifically made for model airplanes and their low Reynolds numbers. It has a database of thousands of airfoils that can be compared to one another using different performance parameters like angle of attack and airspeed.

For example, if you wanted to import the stock Duelist airfoil into the program and compare it to others within its performance range you may be able to improve the speed envelope drastically with a slightly thinner wing(from 15% down to 14% thickness ratio for example). There is even a provision for designing flaps!