This is a maneuver I feel that the RVs are not well
suited for because high G forces are needed to produce a brisk
snap roll. The low stall speed, and thus low maneuvering speed,
of the RVs limit the speed range in which snap rolls can be
performed....A careless approach to snap
rolls can overstress the airframe and cause structural failure.
This is probably a good recommendation for most RV pilots who have not studied and received training, since homegrown snap roll technique invariably leads to very rough technique, pulling too hard, and maybe even putting a good bit of rolling G on the airplane. There's a very well known and long-time aviation writer who describes a god-awful rough snap roll technique. What many don't realize is how small of a stick pull snaps can be done with if our technique is good. First problem is thinking of snaps as "horizontal spins". That will lead to rough technique. 3.5G's will do a good snap in the Pitts. I'd be curious what Ron sees in his RV-8. A snap on top of a loop is a very low G snap. Snaps do put torsional stress on the wings and tail section - the amount being a function of entry airspeed.