SAIL-SIZE/SAILOR-WEIGHT, EDIT

SAIL-SIZE/SAILOR-WEIGHT, EDIT

Post by DBlackm » Wed, 04 Oct 1995 04:00:00

Recent postings about sail size versus sailor size inspire me
to post excerpts from 1993 quasi-study I did relative to
uphauling strain and effort.  A by-product of the study, is my
conviction that sailors of equal skill and endurance, regardless
of their weight or sex, can compete as a class based on the ratio of
their sail area to their body weight.  For example,  you might have
3-4, 4-5 and 5-6 sq meter/100 lb classes for a light-wind regatta.
When you divide these classes into Advanced and Sport fleets, you
have 18 possible (meaningful) trophies.  

I am in total agreement with Clyde Crocker and others who believe
"RACING WHAT YOU OWN" is the way of the future.  One-Design
sailboards are good only for sailors of One-Design: There's no way
that a 220 pounder can keep up with a 120 pounder, until the little
guy is overpowered.  If recreational course racing (and possibly
the windsurfing sport) is to survive, It seems essential that USWA
and AIWA help Clyde "Level the playing field" with something as
simple as area/weight ratio classes.  

The data in the following excerpts is quasi-analytical and "shaped"
by comments from a fairly wide range of boardsailors.  More
comments are welcome.  
                         ********
If you are using a medium or larger sail, Easy Riser has no
doubt that the SAIL HOIST can improve your sailing enjoyment.
But how big is medium?  In the absence of standard industry
terminology, Easy Riser uses the following table to define
relative sail size:  

SAIL SIZE      AREA/BODY WEIGHT    WIND RANGE
Relative       Sq Meters/100 lbs        mph

Tiny                 1.36              35+
Small                2.27              20-35
Medium               3.18              15-20
Big                  4.09              10-15
Large                5.00               7-10
Huge                 5.91               5-7

Wind range defines the relative size of sail that you should use,
while your weight is the primary determinant for the actual sail
area.  This table ignores non-linearities, physiological differ-
ences and skill-level, but should be "in the ball park" for the
intermediate.  What the table suggests is that people of widely
different size should be equally matched for racing, if they use
the same relative sail size.  The following table may help you
"locate" yourself without doing the arithmetic:

BODY WEIGHT    SAIL SIZE, Sq Meters
WEIGHT             Medium       Big           Large
lbs                 15 knts      10 knts       7 knts

 80                  2.5          3.3           4.0
100                  3.2          4.1           5.0
120                  3.8          4.9           6.0
140                  4.5          5.7           7.0
160                  5.1          6.5           8.0
180                  5.7          7.4           9.0
200                  6.4          8.2          10.0
220                  7.0          9.0          11.0

The above three relative sail sizes should apply to over 80% of
course-type regattas, except at the high-wind mecas.  

Open-class racing sailors can recover from a blow-down in less
than half the time, by deploying the gin-pole.  We don't have a
database yet, but one 215 lb sailor consistently reduces uphaul
time from 45 to 15 seconds in hoisting an 11 square meter sail
(large sail by above definition) in 15 mph wind.  

The recreational sailor should find the SAIL HOIST to be a
necessity for large and huge sails.  It is more than just a
luxury with smaller sails, however, because even a mid-sized sail
can become "huge" when the wind picks up.  The SAIL HOIST adds
only 1.3 pounds to your rig (below the boom), allows normal
uphauling and does not interfere with beach or water-starts.
Once you have set the gin-pole length, you can use it to set
boom-height and rig the SAIL HOIST in less than a minute.  Once
you have used the EASY RISER SAIL HOIST, we think you'll compare
it to your harness, in terms of increased sailing enjoyment.  
                                         *******
This sneaky  commercial will be somewhat moot if sailboard
racing continues its present course.  

Apologies for editing and formatting of 1st posting.