Originally Posted by Nicholson58
I last read that the engine was flooded out. Water was comming in at close to 700 GPM according to the Coast Guard. It would have taken a mighty pump to keep up.
engine will operate underwater provided it has proper inlet air ducting from a higher location. (and suitable plumbing
A pump direct-driven from the engine (with NO reliance on electricity, implying NOT electrically clutched) would handle such an inflow easily, and given a wooden ship of the size of the Bounty replica such an inflow is eminently likely.
So there seems to me there would have to be extenuating circumstances for the engine to have "flooded out"
As to the quoted inflow, and whether it should have been manageable:
The calculations look something like this, using US units in deference to the Bounty's presumed flag:
Assume a head
of twenty feet (very generous)
Take the weight of a gallon of water as 8.3 lbs
700 GPM equates to 5,810 pounds of water per minute
Pumping this to a height of twenty feet requires
5,810 * 20 or 116,200 foot pounds per minute
33,000 foot pound per minute equates to 1 horsepower
Hence such a flow would represent a hydraulic power of 116,200 /33,000 or 3.5 horsepower
Obviously there is an efficiency factor to be applied to this, but it would certainly be well over 50%, so we're looking VERY conservatively at 7 hp.
I'm not sure this qualifies as a 'mighty pump', in the context of a large planked ocean-going ship with so many souls on board.
7000 gpm would be eminently doable, let alone 700.
In fact, as Evans S posted, it seems the main pump was a small mains powered electrical unit (which seems woefully misguided) further compromised by the piping being undersized even in relation to the pump, let alone the size of the ship.
If it had been working, and the inlets were not choked, it would have nevertheless almost certainly have handled 700gpm