In other words, after all that faffing about, they’d sink anyway. More importantly, even modern lifejackets top out at a buoyancy of 275N, which still leaves our pair a full 419N over. What about the lifejacket theory, though? What if Rose did the honourable thing and gave hers up? In water that cold (around -2.2 celsius at the time of the boat’s sinking), Jack would be unconscious within 15 minutes of first going in – and he’d already been in there for a fair old while before even getting round to trying to affix a lifejacket to a bobbing piece of wood. You don’t need a white coat and bushy eyebrows to know that 3,184 is bigger than 2,490, and Jack, Rose and one quite intricately carved piece of wood are therefore sinkier than Armitage Shanks. In ice-cold salt water, oak in those dimensions would give an upward buoyant force of 2,490N. The couple’s weights at the time – which are apparently discoverable if you look hard enough – are 715N for Leo and 549N for Kate. The boating boffins at Physics Central discovered that a piece of oak of that size and thickness has a weight (volume x density x gravity) of 1,920 newtons. But what this doesn’t take into account is buoyancy. According to a deep dive done by Physics Central, Rose’s raft was 183cm x 91cm. And it was certainly big enough in terms of surface area to accommodate both bodies: Leo’s height is 183cm, Kate’s is 169cm the shoulder width of the average man is 39.6cm and a woman’s is 36.7cm, forming a body warmth-sharing total of 76.3cm. Firstly, the debris wasn’t actually a door at all, but a chunk of oak door frame, according to comparisons made to actual wreckage recovered from the ship. There’s more to life on driftwood in the north Atlantic than simple wobbliness.
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