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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 sail trim book suggestions		  New Topic  Topic Locked
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Merrick
Navigator

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USA
192 Posts
Initially Posted - 06/04/2008 :  20:52:15  Show Profile
Can anyone recommend a book on sail trim? One that is useful to an average C25 owner who knows the basics but would like to learn more?

1981 #2555 "Aero"
sk/sr
Coosaw Island, SC
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 06/04/2008 :  23:02:38  Show Profile
I use and recommend the "Sail Trim Users Guide" by Don Guillette. It is very informative and he will gladly respond to e-mail questions. He also hosts a [url="http://www.sailboatowners.com/forums/menunew.tpl?fno=502&uid=73210078960"]Sail Trim Forum[/url] on sailboatowners.com forums. Along with the book I got a few of his charts that you can use on the boat. I find the book an excellent resource.
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stampeder
Master Marine Consultant

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1608 Posts
Response Posted - 06/04/2008 :  23:05:43  Show Profile
Oddly enough, there is a book called 'Sail Trim, theory and practice'
by Peter Hahne.
Good pictures, uses almost exclusively, boats our size as examples.
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Stardog
Captain

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USA
319 Posts
Response Posted - 06/05/2008 :  08:10:49  Show Profile
Here is a book I've recently ordered Advanced Sailing ISBN_9780312006310 by Tony Gibbs. I think it's out of print, but it's still very popular and I found hundreds of listings on the internet for used copies.

I used to have a lot of books on sailing, oddly I've given them away over the years, to friends and acquaintances who wanted to learn.

Here is a great website I found-
http://www.onemetre.net/Design/Design.htm

It contains a huge amount of information about sails, hulls and how they work. Not something you'll cover in a single sitting, but very interesting stuff and once you have read the portions on how sails work you'll understand exactly what you are doing to your sails when you trim them. Here is a list of topics on the website to pique your interest, don't be intimidated by the number of topics or the names, this stuff is not that hard to learn and knowing it will make a huge difference in your sailing abilities:

How fins and sails work
Aspect ratio
Wash
Planform & Vortices
Boundary layer
Reynolds number
Sheeting
Twist
Slot Downwash
Sail section lift
Slot Effect
Wind tunnel (2) Sheeting angles
How a yacht works
Points of sailing
Downwind sailing and hull speed
Sailing on the wind
Lift & drag
Apparent wind
Wind Gradient
Twist due to wind gradient
Big boat instrumentation
Wind tunnel Drive vs heel
Wind tunnel Goosewinged vs same gybe
Appendage design
Fin & rudder size
Fin & rudder planforms
Fin sections
Rudder sections
Rudder balance Bulb size & shape
Bulb cant
Marko's bulb calculator
Foil planforms
Fin area
Foil Sections and forces
Oval Bulb
Hull design
Froude number
Surface friction
Wave drag
Hull lines Hull design with arcs
Metacentric moments
Boundary layer
Flow around a hull
Flow around a hull 2
Permitted roughness
Turbulators
Sails and rigging design
Shrouds
Jumpers
Stays
Spreaders
Mast
Sail-mast interaction
Jibstay sag
Windage
Gooseneck geometry
Topping lift
Sail camber
Gap between jib foot and deck Sail shape
Sail draft
2D Entry & Exit Angles
Gap between sail and mast
Sail Twist
Twist & downwash
Twist measurement
Twist measurement (part 2)
Wind tunnel (3) Twist
Jib foot gap to deck
The boat as a whole
Balance
Stability
Environment
Trade-offs
Class rule effects Balance due to hull shape
Rig tune and snap weather helm
Tuning weather helm
Simple VPP
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Merrick
Navigator

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USA
192 Posts
Response Posted - 06/07/2008 :  11:51:19  Show Profile
thanks for the suggestions. Stardog that website has a huge amount of information, like you said. I'll be venturing into it a little at a time and see what I can pick up. Sail shape/ trim is one of the things that makes sailing so much more interesting than "boating" because there is so much to learn.
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 06/07/2008 :  15:41:22  Show Profile  Visit Champipple's Homepage
FYI - Don Giulette used to be a C25 owner here...


I started with Walker's "A Manual of Sail Trim" and have also read Colgates entry level book along with the North Sails book on Trim and tactics.

All worth the spot on the shelf.
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Stu Jackson C34
Admiral

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844 Posts
Response Posted - 06/07/2008 :  17:27:55  Show Profile
Don's material is good stuff. One thing I'd add to ALL of the information that has been presented and proposed for sources: by the end of the day, and by the end of a "career" in sailing, IF IT LOOKS GOOD IT USUALLY IS RIGHT. Parallel to that: when in doubt, let it out.

That said, save lotsa $$ on books!

Randy knows me well enough to get the joke...
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 06/07/2008 :  23:47:27  Show Profile
Stu, be sure to let me know if you get to Eugene to visit the UO.
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Stardog
Captain

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USA
319 Posts
Response Posted - 06/09/2008 :  10:59:00  Show Profile
Stu is absolutely right, there is a hugh amount of information out there, if it's too technical or doesn't make sense, move on to something else. I find it's usually best to pick rather broad topics and read up on them, then you can delve into the finer details as questions come up.
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aeckhart
Master Marine Consultant

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USA
1709 Posts
Response Posted - 06/09/2008 :  12:37:40  Show Profile  Visit aeckhart's Homepage
A very good source sail trim is North Sails "North U" sail trim course. It comes as two books or a CD. Very helpful with as little as possible of the physics part of sail trim.
Edited by - aeckhart on 06/09/2008 12:38:26
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