No in all cases does the moving of the wing tip forward reduce the stall speed. Depends on the wings aspect ratio for how it performs...The stall we are talking about in a snap is not speed related. Its an angle of attack causing the airflow to break or depart from the flow over the wing....

What you are doing by moving the wing tip forward and giving more taper on the trailing edge is making the wing act like a smaller wing.....also you are cutting the sq's down in size and this increases the wing loading.....

Aspect ratio is a huge contributor to the way a wing performs.....take a long wing like a sailplane...long wing small chord...Now take an aerobatic model..shorter wing longer chord...The long wing is not as good at rolls and snaps...but is really stable and good at lift and low on drag. The shorter wider wings are not as good at lift and have more drag...but roll and snap better.

I think the real reason the trailing edge taper helps snaps is it really helps the wing start flying again after it is stalled...and its easier to stall quickly. You have to remember that a wing section has turbulence off the back of the section...this disturbed air affects the way the wing performs....By putting some taper on the trailing edge it moves this turbulence forward and as a result of it makes the turbulence not come off the wing all at the same point...like straight TE....in stead the drag and the choppy air comes off the tip first and while its getting disturbed the root of the wing is still flying on the same air in the middle of the wing...I think this might have something to with it...also the wings seem to have less inertia....why this is I don't know...but they seem to start and stop quicker in the snap...

Snaps are not a function of airspeed to get the wing stalled.....The more airspeed the more elevator or angle of attack needed to get the wing to depart. But Aspect ratio of the wing is a big deal.

Troy Newman