First one must imagine sailing during the early 18th
century. Navigation was as much an art as a science. The compass showed north,
and calculations gave a good approximation of the latitude (the distance north or
south of the equator) but no one had yet figured out how to calculate longitude
(the distance from east to west.) Because of this, it was impossible to ever
tell exactly where you were.
Most navigators also used a version of navigation
called “ded reckoning.” This worked by making notes to the effect of “we
traveled northwest for 6 hours at about 7 knots, and then turned and traveled
for 2 hours at about 4 knots.” Assuming that you knew where you were when you
started and did the math right, you could figure where you were at the end of
the day.
If you think this seems like a terrifyingly vague
way to determine where you were you would be right. Add to this that many
European ships were traveling to places that they had no record of, and you
have a recipe for disaster.
Ships ran aground. This happened when the bottom
of the bottom of the ship (like icebergs, ships have a lot of their bulk underneath
the water) hit the bottom of the sea (coral reef, rock outcropping or shore.)
Because all this was happening underwater, it was hard to tell how deep the
water under the boat was.
Ships tried to get information about the bottom of
the sea by dropping a piece of lead coated with wax and tied to a string. Once
the lead weight hit the bottom it would be pulled up and examined. The length of
the string told how deep the bottom was, and whatever stuck to the wax gave an
indication of what was down there… It might be soft sand or hard rock.
This system was far better than nothing, but a
sudden change might leave a ship bumping along the bottom. If the ship struck
hard enough, it might run aground.
A grounded ship was in trouble. Striking a hard
surface would damage the bottom of the boat, allowing water to get in. This was
when the ship’s carpenter might show his skills. A good carpenter might be able
to plug any holed before the ship took on too much water.
But even if the hull was not damaged, or the
damage could be repaired, the ship was now stuck. Friction with the sea bottom might
prevent the vessel from moving.
The crew could do many things to get off the
underwater hazard. In some cases a rising tide might simply lift the ship
clear. But if the accident happened when the tide was already high, a receding
tide might leave the ship literally high and dry.
Ships were not designed to hang in the air, supported
at one point by a solid object, but with other parts dangling unsupported. Some
ships came through accidents like this but in many cases the keel (essentially
the spine of the ship) broke. A ship with a broken keel was damaged beyond repair.
The crew’s only recourse was to load supplies into smaller boats and try to get
home some other way, or to move supplies to the nearest shore, assuming an
island or mainland was nearby.
Another method was to lighten the ship. Cannons
could be thrown overboard (each cannon might weigh as much as several tons) or
heavy cargo could be pitched over the side or if the crew was lucky, hauled to a
nearby shore. If the crew was desperate, even the precious drinking water might
be pumped over the side.
These actions might allow the ship to float free
on the next high tide.
Other actions taken to free s ship that had run
aground included running a line to another ship, or even a small boat, and attempting
to tow the larger sailing ship clear. Obviously efforts would also be made to
harness the wind to drive the vessel off the ground. Once again, if some other
kind of solid matter – an island perhaps – was close enough, rope might be tied
to anything handy, such a spike run into rock or perhaps a palm tree, in an
effort to haul the ship free.
If the vessel was stuck in mud, it might have an
un-damaged hull and yet be held firm by suction. In order to break the tension
of the mud, the crew might try moving suddenly from one side of the ship to the
other, trying to cause enough side-to-side movement that the suction would
break. War ships sometimes fired their guns into a muddy entrapment, hoping the
shock and vibration would set them free.
These were the good ways to run aground.
The worst way was to be blown onto a rocky shore
by storm winds. This was every sailor’s nightmare. On a dark night or in an unfamiliar place, the
grounding might come without warning. The momentum of the ship would put a
terrible strain on the masts, and it was very common for them to break.
The loss of masts and therefor sails, meant that
the ship lost all headway. This put it at the mercy of the sea. With no forward
momentum, the ship would turn broadside to the waves. And if the seas were
high, waves could wash up over the deck. A strong enough sea might even roll a
ship upside down.
This was the disaster that sunk the mighty pirate
ship Whydah, flipping her upside down and killing all but 7 of her 150 man
crew. It destroyed the Spanish Treasure Fleet of 1715, wiping out 11 out of 12
vessels and strewing gold over Florida’s coasts, and dropping so many doubloons
into the sea that they are still washing ashore today.
So, if you go sailing, thank your lucky stars that
we now have accurate maps not only of the coasts but of the sea’s bottom as
well. And thank them again for boat motors and GPS. Sailing is safer now,
though less romantic.
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