David
I read long ago an article by some America's Cup sailors about this very
topic about which bottom was fasterthe article said the sailors
found that a bottom the consistency of something like 'an orange peel'
was the fastestthey said a smooth bottom contributes to too much
friction between it and the water flowing over it. Whereas the orange
peel bottom causes a turbulence which lowered the friction between the
bottom and the flow of the water actually made it faster.
I have no first hand knowledge of thisjust what I read.
Rob Abbott
AZURA
C&C 32 - #277
Halifax, N.S.
On 2021-11-30 1:45 p.m., David Knecht via CnC-List wrote:
I have been considering what kind of bottom paint to use in the future
and it seems that most racers have a very hard/smooth/burnished bottom
on their boats. So, I was wondering if there is data to support that
this is important. One reason for asking is that in addition to being
a sailor, I am also a cyclist. A few years ago, the hypothesis that
was accepted by all cyclists, including pro teams, was that thin, high
pressure tires were the fastest. Then someone actually did the
experimental science, and found that wider, lower pressure tires were
actually as fast or faster. Counterintuitive, but data trumps
intuition, and that is why we should test obvious and intuitive
assumptions. So my question is, has anyone seen actual experimental
data on comparing different smoothnesses and type of bottom paint vs.
boat speed under controlled conditions? Thanks- Dave
S/V Aries
1990 C&C 34+
New London, CT
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Thanks to all of the subscribers that contributed to the list to help with the
costs involved. If you want to show your support to the list - use PayPal to
send contribution -- https://www.paypal.me/stumurray Thanks - Stu
