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Thread: Coquina
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29th April 2009, 09:01 PM #31
You have to help me here Rob I know not what you mean. I think a lot of visitors are silently grateful to those who post......maybe....or don't want to pick on an amateur like me not sure which perhaps both.
Nice featherboard set-up. Which method did you use to establish the dimensions of the staves and their respective birdsmouthes (?) (beaks, surely!) for the diameter you needed?
Mr. Hylans scaled plans are extremely detailed so I just took the dimensions off them. To check the taper dimensions I used this article on duckworks to understand how it all works
The thing missing is the how to unlike Mik he assumes the builder has the necessary skill and knowledge to tackle the build.....ah could be a problem. He goes so far as to warn the would be builder not to bother contacting him for guidance as he will not respond, understandable really.
Mike
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29th April 2009, 09:21 PM #32
Sorry, just bleating I suppose, but I know that any build can require a bit of encouragement from time to time. I know I've certainly enjoyed the encouragement and interest from you and several others, but I'm sure there are some who find that posting their own thread can feel like talking to themself sometimes...but that's inevitable I expect. It's a real privilege to be allowed into other amateur workshops on the web.
That is a really handy article, by the way, thanks. Hadn't spotted it till now
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29th April 2009, 11:31 PM #33
I must have had my head in the clouds .. quite forget that this was happening!
Keep up the good work!!!
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2nd May 2009, 03:45 PM #34
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4th May 2009, 11:20 PM #35
From a light cirrus through to a heavy cumulonimbus
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4th May 2009, 11:39 PM #36
Mik- stay away from that heavy cumulus stuff, it curls your toenails
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4th May 2009, 11:46 PM #37
OK while we are all dreamily talking of clouds and things what about a name.
I like Zephyr or something that conjures sailing along at dawn etc think you get the picture. Zephyr has obviously been used countless times before.......still it is rather good a bit like Serenity or ................... Quiet time......hmmmm.
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5th May 2009, 01:42 AM #38
"quiet time"
not bad at all.
No capitals.
Just........quiet.............. time.
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5th May 2009, 09:29 AM #39
Whisp
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5th May 2009, 10:20 AM #40
Thanks Rob....Whisp.....I like it.
AJ quiet time is a alteration of another famous Herreshoff name Quiet Tune, both capture the sailing mood I hope to enjoy in maybe 2 or 3 years time. Well OK could be 4 or 5
Plenty of time to mull over this subject.
Cheers
Mike
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6th May 2009, 12:21 AM #41
You know your boats Mike, I was about to say the same about the Quiet.
MIK
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6th May 2009, 01:22 AM #42Senior Member
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This question might be better answered by someone like MIK, but I'll take answers from anybody......
Firstly the Coquina is a beautiful boat and is something that I am considering in the future. But, what I have noticed about some of these "traditional" style boats, is the swing keel centerboard seems to be little more that a thick sheet of metal(3/4").
Would some of these boats be improved with a NACA style centerboard rather than a flat plate???
Some of the complaints about the Coquina have been directed towards its windward performance. So would a new CB improve this???
Cheers
Mickj
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6th May 2009, 03:57 AM #43
Coquina would have some limited improvements with a NACA foil shapes incorporated into her appendages, but performance improvements wouldn't be dramatic. You might gain a degree or two pointing ability, slightly better steering response, the centerboard and rudder could "hang on" longer before stalling, but we're talking quite marginal results.
With her low aspect ratio sail plan and appendages, she has a limited set of skills. The biggest improvements would be in her rudder.
Instead of real NACA foil sections on the centerboard a "slab sided" board would improve performance slightly with a whole lot less work.
On low speed craft (displacement mode) these are the shapes I use. For those not familiar with slab sided foils, they are as the term suggests a flat plate, but the leading edge is nicely rounded (elliptical) and some taper is worked in on the trailing edge. It's a lot less effort to shape a board like this.
Coquina's abilities come more from the shapes Herreshoff used in his hull then the appendages. She would have better maneuverability with a deeper rudder, but she's not helpless as designed.
So, to answer your question, no Coquina wouldn't benefit from foil sections on her centerboard (unless you're measuring 1/10 of a knot differences), at least not noticeably enough to warrant the extra work of making one. She would respond to a higher aspect rudder, but she's well balanced as designed. The barn door she uses for her rudder can get pretty "hard mouthed" in increasing winds, but this is a warning sign, to take you little boat to shore, before you get your butt kicked.
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6th May 2009, 07:40 PM #44
Not really Mik but I have been doing a bit of searching on the Herreshoffs, Nat and LF and find it facinating not to mention the beautiful boats.
I came across this link speaking of Quiet Tune she is the bees knees.
http://yourtrip.travelchannel.com/cl...5801A295DDC02E
Mike
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6th May 2009, 08:07 PM #45
Truly a magic little video