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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation > Check my math
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


Thread: Check my math Reply to Thread
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Topic Review (Newest First)
06-17-2010 07:03 PM
donlofland Reminds me of sailing out of Everett marina one afternoon-hoisted the main, the wake was gurgling nicely, and I was a content man. Then my daughter pointed out we weren't moving-just holding our position relative to the shore. Hoisting the jib got us going, though.
06-17-2010 04:01 AM
davidpm
Quote:
Originally Posted by Melantho View Post
This all sounds eerily familiar. Whenever I choose a destination, the current is against me, and the wind is either 20 kts on the nose or 3 kts directly downwind.

My advice to the original question: don't do as I do and (attempt to) sail to a schedule.

Jack
YES, YES, I thought it was just me.
06-16-2010 01:39 PM
Melantho This all sounds eerily familiar. Whenever I choose a destination, the current is against me, and the wind is either 20 kts on the nose or 3 kts directly downwind.

My advice to the original question: don't do as I do and (attempt to) sail to a schedule.

Jack
06-14-2010 09:26 PM
Rockter David :

I am afraid that things are against you.

The best angle to the wind you can manage is 50 deg.

The cosine of that is 0.6428.

Your water speed is 3 kt.

Assuming no leeway, your corrected speed in the direction you wish to go is...

3*cos{50} = 3*0.6428 = 1.9284 kt.

If the current from the west is more than that, you won't make any progress.

Leeway will worsen things again.

In those conditions, I would just motor with head to weather, and pound it out.
06-14-2010 07:29 PM
hellosailor Sounds about right.

Heck, I've been motorsailing at over 6 knots through the water without being able to make fifty feet over the ground. that when it pays off learning how to eek every extra tenth of a knot out of your boat, so at least you're not going backwards.
06-14-2010 12:50 PM
nk235 I agree with DS and the others. In some bodies of water timing the current is the only way to do it. Heading East or West in Long Island Sound is one of those times.

If you do time it right however it can really HELP you instead of being a pain in the arse. For instance every year my gf and I sail our old shoe Morgan 32' (very slow in light air) out to Block Island from Mt. Sinai harbor. We always leave so that we time the start of the Ebb as our departure time. First day we sail a short leg to Mattituck inlet which is only 4 hours (doing an average of 7 knots with current) and then a longer 8-10 hour day to Block the next day. Some years we litterally had to wake up at 3:30AM while it is pitch black outside to get underway for a 4:15 Ebb start. The benefit is that for a good 5 hours we are doing a bare minimum of 7 knots, while sometimes shooting as high as 11 knots over ground (while going through the Race). Gets us to Block in a total of around 12 hours (inlcuding the Mt. Sinai to Mattituck leg). If we were to do one long leg right from Mt. Sinai to Block without stopping it would probably take 18 hours PLUS! Thats because for half the trip we would be doing about 2-3 knots over ground!

So all in all it is a pain to have to deal with it but if used to your advantage it can really give you a speed boost you don't see in other bodies of water.

-Nick
06-14-2010 12:27 PM
Boasun You are on an Ebb Current. Wait until it becomes a Flood current. Then the current will carry you westward and the light west wind will have an apparent faster speed and you can sail to the west easily.
06-14-2010 08:28 AM
chucklesR Crank the motor on at just above idle, that should give you 3 kts or so of push; which will also bring the apparent wind forward and let you point a little higher.

It's a win/win, faster and higher, and maybe 1/4 gallon per hour of fuel.
06-13-2010 09:27 AM
paulk You need to sail over to the Connecticut shore where there's less current. By the time you get there, it will have changed to be in your favor. (Though there will be less of it.) It sounds like you need new sails - even "new to you" old sails might be an improvement.
06-13-2010 08:27 AM
Joesaila
Pilot book reading

What are you doing on my boat? The difference in current and tide is equal to the distance squared....twice.
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