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post #1 of 39 Old 11-24-2008 Thread Starter
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Daily Runs

Hi, we're currently planning an extended cruise, possibly england -> brazil, and are trying to determine what a conservative figure for average daily run would be. Our boat is a heavy 25 foot steel boat, sail area, approx 350 sq. feet.
Does anyone know of a source for daily run data to give an idea what we should be planning for?
It would be most usefull if it also give the data for that boat such as sail area, displacement length, so that a meaningful comparison can be made?

Many thanks,

Chris

Last edited by chibb; 11-24-2008 at 07:34 AM.
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post #2 of 39 Old 11-24-2008
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Hi Chris, please go here CLICK

You can compare your boat with similar boats. And if you don't find your boat like that you can add it there.

It's going to be a really really large passage on your boat..you're leaving from England? have you decided on a route yet?

You will, in a boat like that, probably average 4 to 6 knots, with some 11 knot peaks on waves. That is a looong pasage indeed...visit Portugal...it's wonderfull


Good luck...

Last edited by Giulietta; 11-24-2008 at 07:16 AM.
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post #3 of 39 Old 11-24-2008 Thread Starter
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Thanks Guilietta, but I can see my request wasn't all that clear. What I'm specifically after is details of what some boats average daily runs are.

The data such as their length/beam/displacement/sail area was just so I could make a meaningful comparison to boat similar to mine.

Our boat is a Tom Thumb 24, which comes out with a hull speed of 6.3 knots, and sail area to displacement ratio of 15.33.

Thanks again,

Chris
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post #4 of 39 Old 11-24-2008 Thread Starter
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I'm too junior to be able to post a link to our proposed route! But it goes something like:

England
Canaries
Recife Brazil
.......lots of brazil....
Down to Uraguay
Up to carribean
Back to england

Looking at something like 2 years.
Our current speed plucked out of thin air for planning is 3.5 knots, which would give daily runs of 84 miles.
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post #5 of 39 Old 11-24-2008
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Well it depends on the boat, crew, conditions, etc.

I average around 10 knots, sometimes a bit more, sometimes less. Normaly for me, where I sail, and when I cruise or ferry the boat, I allways calculate ETA based on 10 miles in one hour, and so far..right on...

in fact lately I have done more than 10 miles/hour.
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post #6 of 39 Old 11-24-2008
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Ahh you have to Stop in Portugal...in a place called cascais..I'll wait for you there for dinner.

Alex
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Cascais looks quite convenient to our route...so may well do, thanks for the kind offer :-)

Wow 10 knots average! - that will be a figure definately beyond our dreams in our small boat !
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post #8 of 39 Old 11-24-2008
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Chibb,

not aware of any site or resource that would give this info. Best I can offer is The Voygager's Handbook by Beth Leonard gives 120-125 NM for a 40ft "traditional" yacht, which would be a "heavy" yacht. This average worked out as 67-72% of the hull speed.

Your boat would get no where near these average runs. Based on your hull speed of 6.3kts and if you could get the same percentages your average would be 4.2 to 4.5 knots, or an average daily run of 100 to 108NM.

The other thing to do is start measuring all your coastal passages and see what your average speed is. Then take a bit off for night sailing, which will probalby be slower.

have fun, Ilenart
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Thanks Ilenart, I've got the book, will find that section now. Sounds like a useful guestimate
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Sadly we're not leaving till July 2009.. have to start and finish boat insides :-)
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