we have a watertender 9.4, pretty common at least on the east coast
of the u.s.a., i've seen it for sale
at west marine
for about $600. the admiral prefers it to our inflatables. it's got a double hull
with air space in between.
since it's possible for it to leak between the hulls it also has a drain plug
and you're supposed to tip it up once in awhile and remove the drain plug
to let out any water
that's accumulated between the hulls. i occasionally do this but have never had any water
a few years ago we were in the exumas
, going about a half mile to shore. we had a 3.5 hp j/e on the back and a bundle of clothes in the boat. it was a bit choppy. the admiral leaned too far forward for some reason and buried the bow. in an instant the boat was full of water up to the gunwhales. but it was floating and level. i shut the engine
down (it was still above water) and we just sat in the boat and bailed it out. then started the engine
and continued on our way.
i also once saw a couple of guys at fernandina beach lower an atomic four into a watertender from a dock
, then tow it out to a sailboat in the harbor, then pick it up with the mainsail