I talked about this extensively on the Lancair ES Yahoo group.  When Bryan Burr did his first test flight (with Orin) the plane had a significant right roll.  I had a similar problem, but from conversations with Bryan and Orin, mine was less.  Since both Bryan and I had the factory wing mating and went through the builders workshop in Redmond, I thought I might have the same problem.  After Bryan flew, but before I flew, I checked my wing incidence.

 

I checked my wings with a jig that fit around the leading edge and laid on the trailing edge.  I measured it at 1' intervals on both sides for comparison.  My wings are right on spec at the root, but at the tips I have 2.7 degrees difference in incidence.  They matched within a tenth of a degree until about the inboard edge of the aileron.  The outboard 2 1/2 feet is where the difference in incidence shows up.  I can stand behind the tail and see it.

 

The correction for the roll was to use offset inserts on the forward bracket to tweak one wing up and the other down.  Tim was great about drilling out brackets and machining the eccentric bushings we needed.  He sent a set to Bryan, then Bryan shipped me his extras, and I got some others from Lancair.

 

Why am I bringing this up in a discussion about stalls?  I think this kind of stuff will affect how a specific plane behaves in a stall.  One guy has very symmetrical wings and he breaks straight ahead, another guy has some uneven twist and he gets a significant wing drop.

 

The plane may fly straight at normal operating speeds because the entire wing is "flying", but at a stall, the difference at the tips could cause a wing drop.  Both Bryan and my plane are gentle in normal stalls, but I don't think Bryan did any deep stalls, neither did I.

 

Mike Easley

Colorado Springs