VERY crazy question (poor mans boat hot tub)

That's a very big if. About 1700 lbs. (plus 500 lbs of people) sloshing around on the flybridge of most small boats would do interesting things to the stability if it didn't completely collapse it. I'm sure other will chime in with other pins for your balloon. Wouldn't surprise me to find it on a boat in Lake Havasu though.

You have a big swimming pool right behind your transom.

I assumed you were talking about a boat under 50'. Last year we had a highly publicized case of a 37' Silverton turning turtle with about 5,000 lbs, of people spread around the boat. It happens amazingly fast.

That cool water makes girls look so good, wakes them up and puts them in the mood to snuggle up to keep warm. Follow with a warm shower and you'll be doing what you really want to be doing at 3 AM. All kidding aside, it just wouldn't work.

Google Lake Havasu and you'll understand my reference. They play with every kind of small boat toy and conduct every kind of crazy behavior you can imagine. Also they do have houseboats there with both portable and fixed hot tubs. The Three Buoys houseboats they rent are a prime example. They have jacuzzis and slides and stick small mobs on them, but you wouldn't do most of what they do on real waters or with your own boat. Here's a thought though. I seem to recall seeing, and possibly here, a jucuzzi that floats in the water. I don't recall exactly how it works, but you might want to look into it. Put "Boat Toys" or "Yacht Toys" in the SEARCH. You'll probably find it.

Perhaps this vid will help explain.

Lake Havasu Houseboat in Bridgewater Channel - YouTube

NYCAP is right! I've seen one go from on the boat to in the water to full of water to people in it.(in S.F. Of course)
Google "Yacht Tub"

Naa... you can have jets, can have them!

Very good point. I used to have one in the room across the hall from my bedroom. How much more convenient could it get? I used it maybe once a month. For that I spent forever and a small fortune trying to keep the chemicals right, $60 a month on electric to heat it, about another $800 a year on repairs, and then there were the leaks. After the third flood I took out my sawzall. The room is now a nice little gym (which also doesn't get used much, but at least it doesn't leak).

I believe most of those hot tubs are either unusable at sea or better not being used while at sea. On most of the big yachts, I was on, the tubs were only used, when the ship was on the hook. Not for stability or weight reasons, they just could not keep the water in, when the boat moved.

A friend of mine owns a large sailing yacht, with a watertight recess on the foredeck for the 17 ft tender, which can be used as a pool for his grandchildren or as a hot tub, when the tender is deployed. But it still would look silly, observing the water floating across the deck, when under sail at 15 degrees of heel.

The smallest yacht I have seen an hot tub on, was the Horizon EP-77. But the boat was unsafe with this extra metric ton of water high up on the sun deck. As far as I know, they have removed that tub in the meantime, because they never used it.

A new definition for poor!

Check out this poor man's pool!
http://www.yachtforums.com/forums/vitters-yacht/6356-vitters-yachts-5.html#post150695
Couldn't even fit it with bubbles machine!

Cheers,

Al