a planing hull MUST have a planer surface to plane on. Think of a stone
skipping across the water. you have to have something approximating a flat
surface parallel to the water.

you only hear of a Hobie cat as "planing" boat when you get someone who
erroneously believes in that bogus concept called "Theoretical Hull Speed",
i.e. an amateur or a professional trying to snooker an amateur.

So the question occurred to me after I closed a reply to Doug King
about sailing hulls.

Are sailboats considered planing hulls?

For example, a Hobie Cat - is that a planing hull?

Later,

Tom