Underwater Jetski?

[Max Wynn]

I've got an old JS440.I wonder what will happen if I make a water proof seal at the carburetor and connect it to a long hose that will get air from the surface.Modify the exhaust so that the exit hole points down wards.And then try running the jetski under water.Has anyone else done this before?What happens?So, how about if a diving tank is connected to the carburetor instead of a hose to the surface?

[linlyons]

it won't work.i've not done it, but i wondered why, instead of all that fancy aqualung stuff, we didn't just put a hose in our mouth, and breathe in through the hose.so, i did an experiment.using my normal lung power, i could draw water, from a bucket, up 2-3 feet in the hose.which means that i could draw air down into the hose about 2-3 feet.no more.your engine could draw air about the same depth.if you had a compressor, you could get a little deeper.you'd also have trouble pushing the exhaust out under water.the water would surely like to come back in.the air tank probably would not work either.it just takes more air than the tank could supply for more than a very short time.want'a try it?get the largest balloon you can find, and make a stopper, so it'll fit tight on the exhaust.when the engine's running, plug the balloon in, and see how long it takes to fill it up.cool idea, mind you.i like it.unfortunately, just because we both like it won't make it work.

[Ron B]

Why dont you just buy a submarine?