If anyones intrested as we are on about bouyancy , just found some photos from about 18 years ago when we used Drums to lift the clubs old concrete slipway as i mentioned earlier in the thread,
biggest raft we made was using 20 drums that lifted near 5 tons ,
last pic taken the same weekend is of an old plywood sailing boat that was completely rotten ,
we tried to save the sinking boat after the owner had bought it cheap and given it a coat of paint whilst working up north ,
He was hoping to sail it home down the east coast from sunderland to southend distance of about 240 miles,
he only got about 15 miles before he ran it aground at Redcar knocking a keel out of place
Redcar lifeboat towed the sinking boat for him into Teesmouth to our slip where we lashed some drums along side to try keep it float whilst we got it onto a borrowed trailer,,that rotten we burned it the next morning and the owner caught the train home .
it was that badly rotten in places you could push your finger through the hull like wet cardboard .