On Sat, 07 Jul 2012 14:48:17 +0200, Martin wrote:

Very little wash but the air escaping from underneath around the skirt
produces lots of spray and the socking big fan on the back (or other
air outlets) used for steering one heck of "draft". They aren't the
most controllable of things either, simple rowing boat is a lot more
effective and quieter enabling conversation between rescuers and
rescuees.

but not much good in a strong current.

I wondered about that but a hover craft hovering doesn't have very much
of itself in the water... But then you don't have much in the way of
force to control it either.

--
Cheers
Dave.