[C38] death roll

[Joseph Launie]

Patrick,
    The death roll (rounding down) has to do with point of sail. It 
occurs when you have a chute up and are in the danger quadrant with 
apparent wind greater than 150 degrees on either jibe. I have gone a lot 
faster beam reaching with the chute up and the boat ran like it was on 
rails. If you REALLY want to get into questions of stability, read 
Marchia (sp?)'s book, Seaworthiness, the forgotten factor. Marchai is a 
Polish engineer who has written a number of great books on sailing. He 
wrights like an engineer with lots of equations and stuff. You can get 
almost everything out of the book by reading the text and ignoring he 
formulas. (in my Journal Editor days I used to make my authors give me 
articles that the reader could understand without reading a single 
formula.)The authors would get even with me by attaching 3 page 
appendices that were 100% formulas for their boss to read. Joe Launie, 
Macavity, Commodore

Patrick Harpole wrote:
>
> *I wonder if the "death roll" has anything to do with hull speed?   As 
> we know a displacement vessel will only go so fast.....square root of 
> length at water-line times some number (1.2?).    No matter how much 
> power you apply boat's speed will not increase.  Death roll probably 
> occurs from having too much sail up....wonder if a sea anchor would 
> slow down .  Probably better idea to decrease sail.*
>
> *Patrick*
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Listserve mailing list
> Listserve at catalina38.org
> http://catalina38.org/mailman/listinfo/listserve_catalina38.org
>   
> ------------------------------------------------------------------------
>
> No virus found in this incoming message.
> Checked by AVG. 
> Version: 7.5.524 / Virus Database: 270.3.0/1505 - Release Date: 6/16/2008 7:20 AM
>   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://catalina38.org/pipermail/listserve_catalina38.org/attachments/20080617/70525997/attachment-0001.htm>