We hoist our dinghy alongside, sometimes, using the spinny halyard
. The whole rig, dinghy, full tank, o/b, and anchor and chain, weighs ~ 255 lbs., and about 110 lbs. empty. Halyard
is 1/2" doublebraid, polyester, breaking strength around 5200 lbs, new.
At 400+ pounds, you may have to install a crane, if two people are going to manage it. We store our RIB disinflated on the foredeck for passages, and it is a handful to inflate and launch over about 15 knots. Then we move the o/b from its mount on the pushpit, to the stern of the dinghy, and slowly lower it down. We can do this safely up to about 20 knots, but the motor
only weighs about 85 lbs, and it is hard to control when all that mass is chest high, (to clear the rail). At ~ 235 lbs., your engine
would be almost 3 times more difficult to handle the way we do ours. Both your dinghy and its engine
are so massy, you'd want them under control the whole time. And, possibly, the engine is too heavy to mount on a pushpit, anyway, without reinforcing the attachments to the deck for a larger footprint per each, and stiffening the structure, as needed.
Someone may recommend the addition of davits
. I'd recommend you read this thread: http://www.cruisersforum.com/forums/...ad-114857.html
It tell of Dockhead's travails with his big, heavy dinghy on his 57 footer. The problems with davits
, in no particular order are chafe from dinghy movement, vulnerability to getting wiped off the boat
if you lose control near something strong enough to do it, vulnerability to being swamped by a wave, windage, and, of course, having them engineered sufficiently strongly. And berthing fees
may be greater because the boat
just got longer from the marina's point of view.
Good luck with it, you may be able to figure out a satisfactory way to handle it, or you may revisit the decision and get something lighter, for ease of handling, which would be the more frugal solution.