||02-02-2006 01:52 PM
Hmmmm! Interesting one, but not unsolveable.
Given that the relative density of fresh water (rain) is 1.0 and the relative density of sea water (on average) is 1.025 then, if the boat is made of material laee dense than sea water, it should float. Freeboard, which should in this case be measured in microns, might be a bit on the low side though.
Oh - forget the hole. That will allow the differing types of water to mix and thus sink the craft!
One other slight problem may well occur. The boat will loose a lot of stability due to the free-surface effect of the rain water. To counteract this, a cellular structure will need to be placed in the boat. Use some light, non absorbant material for this.
The cellular division of the hull will lead to another problem of course - how to find the place to sit in the boat. But that wasn't the problem was it?
Probably the best solution however would be to leave the dingy in shallow water after filling it himself with sea water. Having already sunk from the salt water your friend filled the boat with, it can't thereafter sink from accumulated rain water!
Maybe your friend should cionsider giving up sailing and learn to play the violin instead?