cracked rib airfoil

[Airhog]

I am just finishing building a Miss Stick designed by Tom Hunt. This model uses the cracked rib wing building method in which a balsa stick is cracked at the spar and the ends glued to the leading and traiing edges to form the upper suface of a rib. A turbulator spar is then glued about half way between the leading edge and the spar. The three straight lines approximate a curve. There was a p-30 free flight rubber design called the Hot Box that appeared in Model Builder magazine years ago that used this method. Does anyone know any more about this airfoil?

[Sparky Paul]

Other than it's an appropriate shape for the task.. there's not much more information needed.

[davidfee]

Ditto on what Sparky Paul said. I guess the point is that it results in a reasonably efficient auto-turbulated airfoil for low Reynolds numbers, and you don't have to cut any ribs. I don't mind cutting ribs, but some folks find it tedious. ;)

-David

[50+AirYears]

It gets used a lot on rubber powered FAC Free Flight events.