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speed difference between tacks

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Post Options Post Options   Quote ellistine Quote  Post ReplyReply Direct Link To This Post Topic: speed difference between tacks
    Posted: 01 Jun 09 at 9:43am
Why is it that when your sailing into the wind and
steering to the telltales that sometimes the boat
travels noticeably slower on one tack than the other?

I'm not on about racing to a mark but just sailing into
the wind.

I suppose it could be a tide thing but would you
actually notice the tide in middle of Portland Harbour?
I hadn't considered it as being tidal.
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Jon Emmett View Drop Down
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Post Options Post Options   Quote Jon Emmett Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 11:00am
You are probably more lined up with the chop on one tack than the other.
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Post Options Post Options   Quote ellistine Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 11:16am
Possibly. I'll have a look at that next time.

Presumably it has to be the water or the boat, there's
nothing odd about the wind that I don't know about?

It seems to happen downwind too with the kite up. You
can be drifting along going nowhere and then throw in a
jibe and your off!
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 11:39am
Originally posted by ellistine

It seems to happen downwind too with the kite up. You can be drifting along going nowhere and then throw in a jibe and your off!

That's almost always tide...
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Post Options Post Options   Quote Jon Emmett Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 11:53am
There are always pressure difference/current dfferences... The faster you are going the sooner you will get into the different conditions.
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Post Options Post Options   Quote Scooby_simon Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 11:58am

Tide would be top of the list

Are your shrouds the same length and thus mast vertical?

Mast bent?

Wanna learn to Ski - PM me..
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Post Options Post Options   Quote ellistine Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 12:00pm
Jon, you've spent a lot of time in Portland Harbour,
what tidal effects are typical there? I perhaps wrongly
assumed it would only really be noticeable near the
entrances and perhaps near Ferry bridge.
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Post Options Post Options   Quote Jon Emmett Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 12:11pm
Eeek equal shroud length that is a whole can of worms... bent foils etc. etc.

The tide in the harbour is significiant and not really something I could get into in a forum post!
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Post Options Post Options   Quote ellistine Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 12:14pm
Originally posted by Jon Emmett

The tide in the harbour is
significiant and not really something I could get into
in a forum post!

Doh. And I even bought your book
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Post Options Post Options   Quote Guest Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 09 at 12:40pm
Probably going fastest on the tack which give you more sun
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