Washout vs. Stall Speed

piper recommends wing washout to be 2.5*. if the washout is set less than the 2.5*, say eg. 1.8* does this raise or lower the stall speed?
thanks

washout

It you put less washout in the wing it will stall slower because you have raised the leading edge of the outer portion of the wing to the same as the inboard portion. Piper put washout in the wing so the stall would start at the root and progress outward giving you some aileron control into the stall.
Dave

And, THAT is a GOOD thing.

MTV

Some of the float guys rig there wings without washout,as to get maximum lift,at a lower angle of attack.So that the wing is making more lift while on the step.Small pond,large trees,also a good thing. But it makes a stall in a cub a bit more abrupt.It will drop a wing alot quicker when stalled.

Glenn

A constant cord wing has a stall progression that starts at the root and progresses out to toward the tip. (tapered wings start in the center and progress toward the tips and roots, elliptical wings stall across the entire span at once) But the USA35B airfoil used on all cubs (and Huskies and Maules) has a very severe stall with little warning. So Taylor, and all the other designers of that era, added the washout to help soften the stall. Later aircraft with airfoils like the NACA 4412 used on the Citabria/Scout line, don't need it.

If you eliminate the washout you will get more max lift, and a lower stall speed (Bob Reeve admitted to using this trick on his Fairchilds). But the stall will be very severe and have little to no warning compared to what you're used to. And of course spin characteristics will be even worse.

Phil