Tacking into Storm and Sunset
The Skipper (Tim Mehrer) (who probably
hates to be called skipper) came into the passengers compartment one
morning and gave us an absolutely brilliant talk on sailing, boats,
and the physics of sailing. Now, I thought I understood how to sail
and what did what. I was mistaken. He brought a white board and a
boat model and proceeded to show us how the universe conspires to
push Zodiac forward through contrary seas.
The secret is low pressure zones. We
create low pressure zones with the wing shapes of the sails, and that
pulls us toward our goal. Oh, and the wind also is just pushing on
the flat parts. But that is only really helping us going down wind.
When we want to go up wind, we need the air to suck our sails toward the low
pressure zone we have created at a point that we hope is balanced
between our huge sails (each pulling at a different vector) and the
center of mass and center of rotation or our vessel. Ok, I made up a
lot of those terms. But Hell, it was a one time 30 minute talk and
that is what I remember.
Anyway, when you want to go to where
the wind is coming from (and for some reason, you usually do, thank
you very much Mr. Murphy), you have to approach it at angles of about
45 degrees. And each time you change your angle of attack, you bring
the bow of the boat across the wind, and that is called tacking.
And when you do that, you have to, in a
controlled manner, bring the sails across to the other side of the
boat. This isn't too difficult as long as you can maintain a
controlled rate of turn and you don't let go of any line at the wrong
time.
For instance.
My sailing station is mainsail topping
lifts. The topping lift is the cable coming down from the mast that
holds up the boom. It literally stops the boom from crashing to the
deck (and thus killing the captain, since the boom is usually right
over his head). On many pleasure sail boats, there is just one
topping lift. It comes from the top of the mast, and goes down to the
end of the boom. The Mainsail is the triangle between the topping
lift, mast, and boom.
However, on the Zodiac, The mainsail is
larger than this triangle (because of the extension that the
gaff-boom gives it) so you need to tighten the topping left that is
on the windward side of the sail and then loosen the one on the lee
side.
Topping left has the fuzzy things. Aft Stay is in the block on the right there. (The right is port, in this case) |
Equally important, since the boom
extends beyond the stern of the boat, you also need to use a flying
aft mainstay. That is the line that runs from near the top of the
main mast down to the stern and supports (stays) the mast from aft.
Someone must have been doing that, but I never saw it because I was
busy doing the topping lift thing.
It goes like this.
The captain tells the first mate to
prepare to come about.
At about the same time he tells helm to
come hard over to windward. (on the Zodiac, this means that the
helmsman starts turning the wheel toward the wind. This takes a
while. You turn hand over hand for many complete rotations of the
ships wheel until you have brought the rudder hard over. At this
point, when I was on the wheel, I said to the captain, “we are hard
over, Sir”. He gave me a strange look. But he smiled. Perhaps he
hasn't read “Master and Commander” enough times. Perhaps I have
read it too often.)
As the boat comes up, the pressure
comes off the sails. Now the boat is just coasting. In order to tack,
we have to have enough headway on the boat to be able to make the 90
degree turn from one tack to the other. If we don't make the turn,
the wind will start pushing on the bow of the boat (and the masts and
other “windage”) and the schooner will continue to slow and
eventually go backwards. This is considered non-ideal and is called (at least by Captain Aubrey) "missing stays".
Today, however, we have a good wind and are making a good pace through the seas. So the bow comes right around and we don't need to do any tricks (like backing the jib to push the bow around faster). We have two topping lift crews, one on the side that is currently providing support, one on the side that will be the support after we tack. The “new” side waits until the pressure has come completely off of the slack topping lift cable. If we tighten it up too early, we will chaff the sail. Not terrible as a one time occurrence, but those sails are expensive. Think of it as turning off the light when you leave a room. So, as soon as we have slack, we pull pull pull to get the slack rope through the blocks, then, we start to “sweat” and “tail”. The sweater is in charge of tightening the line, the tailer is in charge of making sure we don't loose any of the progress the sweater is making. He just has to take up the slack that the sweater has gained.
Sweat and Tail on that Topping Lift !!
One of the things I love about sailing
is the constant and ubiquitous demonstration of basic physics and
simple machines. Here we have a huge boom, the weight of which needs
to be support by a line that a single person is going to tighten. And
we do that using physics. Does the sweater just pull down? Well, she
could do that, but that would just put their mass into the equation,
and that might not be enough (even with the 6:1 block and pulley). So instead, she pulls down and sideways. Effecting make a lever out of the line. So she pulls
sideways about 3 feet. And that gains us 1 foot slack, which I tail
through the belaying pin. Once we have pulled enough line (marked by
a little piece of leather on the halyard) I yell “hold” and throw
a figure 8 and locking not on the belaying pin.
Done with the hold
side. We look under the boom and make eye contact with the other
team. They can now loosen their side. Making eye contact is a safety
thing. They don't want to let loose until they are sure we are
secure, because we don't want that boom coming crashing down on the
deck, taking out the captain and helmsman (and helm).
Up on the bow, the jib and staysail
crew are busy sheeting in the sails on the opposite side of the boat
and the foresale is being secured also. We are on the other tack and
starting to pick up speed. But we aren't done until we have coiled
down all of the lines and prepared things for the next tack.
That done, I sit back on the high side
(which we suddenly have, the breeze must be freshining) and start to
look around. The wind is coming in over the starboard side. So we are
on a Starboard tack. Cool. We are sailing North West along the US
Canada border heading toward our evening anchorage. I look off to the
south toward Orcas Island. It is sure looking dark over that way.
Wind and Rain. I recall the story the captain told us about a family
that went to the bottom around in this area because of a errant wind
coming down off of Mount Constitution (that big hill there on Orcas,
the one with the antennas). He had a nautical term for that wind. It started with a W. Now what was it....
“Prepare to Come About”.
“Helm Alee”
Woe there, we are turning faster this
time. The wind is picking up even more. We go onto port tack quite
smartly. Now we are HAVING FUN !! The deck has a definite slope to it
now as we heel to starboard. The Captain, in his quiet way, instructs
a few non-sailor passengers to come up to the high side of the
schooner. It is harder to fall overboard from the high side. We are
really moving now !! Everyone is laughing and there is a wild
excitement in the air. Some rain drops are hitting our heads, or
perhaps that is ocean spray.
She is standing straight up. The boat is slanted. |
Look at those smiles. |
“Prepare to Come About”
What the hell. We just got here. Oh, we
must be trying to tack into that little bay over there.
“Helm's Alee”.
We turned fast again.... and then we
just stopped turning. What? Something is wrong up on the bow. Our
crewman leaves us and runs up to the port jib sheets. Something got
stuck. I think that stopped our turn. And the wind is blowing even
harder. The rain is falling. The captain isn't liking this. This
isn't good weather to be teaching a neophyte passenger-crew how to do
highspeed tacking. And he knows that. He eases us back onto our
previous tack and gives to order to lower the mainsail. (The captain later told us that the real thing he was concerned about was the inflatable boats that we had hanging on the side had a tendency to catch a strong wind, and he didn't want them bouncing off the ocean as the Zodiac heeled and then catch the wind and come roaring onto the deck, engine and all. Bad for the deck. And the passengers).
The Topping lift team also owns
lowering the mainsail, and we couldn't get it down quickly
enough for the captain. To lower the sail, you just need to belay the
100 yards of main halyard through the belay pins. Not too hard, as
long as the line doesn't foul. But you need to do it in a controlled manner.
“All hands aft to furl mainsail”.
Oh, yeah. I forgot about that.
To furl the main, you get a bunch of
people up standing on the boom and leaning over the gaff. The other
half of the crew push the sail up to the guys on the boom and they
fold it under itself. I guess this is the fist and furl stuff they
talk about in Master and Commander. Anyway, after learning that we
were supposed to be up on the boom, I wasn't going to be left on the
deck. Why? Not sure, just a challenge. And I used to be good at
climbing trees. Besides, everyone else is doing it. Turns out there are a lot of handholds. Lines and
such, so I could get myself up just fine. Then it is just a few
minutes to tuck the sail into itself and get the securing lines
tight. Then I have to get down. I go pretty slowly getting down.
Because the crew gets pissed if you step through the window glass. Of
course, it probably freaks them out must having a old fat guy up on
the boom. Hey, it was fun, though I certainly wasn't impressing any
young women.
Now that the sails are all down and
furled, the weather isn't quite so scarry. It is still windy and
blowing and the rain is cold, but we are under control and roll into
our little port in good form.
Oh, that was EXACTLY the right amount
of excitement.
Later it quit raining and we were
gifted with a truly magnificent sunset. I was in the chart house
having a beer when 2 of my friends called me up on deck. There was
Mount Baker in all of her glory. The setting sun was light up the
moutain from above the local cloud cover. So we had the infinite
horizontal dark of the ocean below, and the dark storm horizon of the
sky above, perfectly framing the Snow and Rock sunlight beauty of the
mountains.
Mt Baker. |
Look at that neat color !! |
Later the sun ducked under the clouds
and gave us some a great yellow color surrounding scenery, a spot lit
nearby island, and a day ending Rainbow.
God what a GREAT DAY.
And in case you want an expert opinion on all of this:
http://flota-navium.blogspot.com/2012/06/june-winds.html?showComment=1341375047459#c6752388961755025472
And in case you want an expert opinion on all of this:
http://flota-navium.blogspot.com/2012/06/june-winds.html?showComment=1341375047459#c6752388961755025472
oh, and Paella on the Grill |