Everything comes into play Brian. Taper, thickness, tip sweep, tip shape to a small extent, location of high point, balance (critical), thickness of trailing edges, airfoil shape, wing loading, tail volume coefficients, and one of the most important but usually overlooked aspects, mass.

You can't be that specific and that general at the same time.

LE radius has an effect on snap entry especially. But more important is the shape of the airfoil from the LE to the high point of the wing. If it's fat and rounded, it won't break as fast as a sharper airfoil. Hoever, as another general rule, sharp LEs tend to fly better at faster speeds. So a snap tends to be fast and violent. If you take the same plane and slow it down too much, which might be an excellent speed for another model, the snap might mush or wallow. There's a million ways to do snaps. Everyone has in thier mind what a snap looks like, and it's usually different.

Wing span is just one part of the total equation, which is why I said "all other things being equal". Same airfoil, taper, high point, balance, wing loading, the one with the shorter wing will snap slightly cleaner simply due to mass and newtons laws of motion.

Ok let's talk about wing rake. Again using a general set of parameters, more rake in a wing makes it more stable in a roll, and is effective dihedral. However, it has some issues with turbulent air, which is exaggerated by a sharp LE. What else is there involved? How much is too much and where does it begin to induce serious roll coupling at hard angles?

This is where planform comes into play. Why are all of the current designs using less total rake but more taper?

Also talking about snaps, the tail areas and moments come into play BIG TIME. the larger the stab, the harder it is to snap (for instance) what you have to find is exactly enough stab to make it stable enough to fly straight, but agile enough to break into a stalled condition and recover quickly. Any more and the scale shifts. What effect does stab thickness have if any?

Just sumpin to chew on.

-Mike