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  #16  
Old 12-18-2006, 09:29 AM
jehardiman jehardiman is offline
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Originally Posted by LP View Post
You confuse my "performance/power" statement and understandibly so. The performance that I speak of is more in how the vessel responds to the power generated by the aero forces on the sails. Does she stand up or does she lay over on her ear? I'm not looking at designing racers, but I'm setting out saying, "I want to build a slow boat," either

LP,

The problem is that it is all linked. Say when a gust hits...do you heel over more or accelerate because inertia won't let you heel? And if you accelerate, does that increase the apparent wind which increases the heeling force (the infamous slow capsize)? Or, because of CLR lead and sail twist off do you round up? Because it is a free-free system with inertia, it is recursive problem, not an exact solution. And don't even start on speed in a seaway unless you really like bifrication theory and data clustering. Even if you do modeling as Tim B points, good agreement is 10-20% variance because you can't get the "perfect" water and wind that the math models require.
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  #17  
Old 12-20-2006, 09:20 AM
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LP LP is offline
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Originally Posted by Tim B View Post
"Basic Ship Theory vols 1 & 2" are good. Also have a look at "Ship Hydrostatics and Stability" by Adrian Biran.

Tim B.
Tim,

Do these texts have the exercises at the end of the chapters like I was asking about?
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  #18  
Old 12-20-2006, 05:09 PM
Tim B Tim B is offline
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They do have a few examples, yes.

I have scribbled up a few examples of my own, they might help you get a better grip on what's going on. They do require some background knowledge, and need a few assumptions to be made.

I'll post the answers after Christmas (probably Boxing day night, GMT)

Cheers,

Tim B.
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File Type: pdf Examples.pdf (185.1 KB, 114 views)
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