you shouldn't have a keel wrap. Of course, it shouldn't be a problem with a full keel either or multihulls.

I haven't had a keel wrap because I swore off mixed rodes and (up until my present boat) had boats
with full keels. I HAVE, though, watched what hassles it caused for other boats while I was anchored.

I hadn't thought about the possibility you raised re powerboats. Haven't thought too much about
small powerboats for that matter. But, what you say seems (at least, theoretically) a reasonable concern.

Jerry