In the RES heyday, many RES planes didn't use shark's teeth. They used
a piece of rubber with a rough surface as a skid. Some used pieces of car
mat others used the tread from an R/C knobby tire. Here is a safe (although
I too, have wondered about the real incidence of injuries from skegs) though
effective solution. Bob Johnson's proposal indicated a "smooth" skid. Just
another 2 cents into the RES kitty.
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