sailor weight vs sail size

sailor weight vs sail size

Post by Rainer Leuschk » Tue, 20 Jun 2000 04:00:00


How does sailor weight relate to sail size?
I'm about 50% heavier than my girlfriend. If you assume that weight is
proportional to sail size, she should be as powered on a 3.5 as I am on a
5.3. That doesn't seem to quite reflect reality. What am I missing?
R!

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sailor weight vs sail size

Post by Mike » Tue, 20 Jun 2000 04:00:00

Sounds like the basic error is your assumption that weight and sail power
are linearly proportional. It's mostly the BOARD that holds us up (supports
our weight), not the sail. A half-meter sail-size difference seems more
common between the genders, but board size differences can be more dramatic.

Mike \m/
To reply directly, remove the SpamDam.

Quote:

> How does sailor weight relate to sail size?
> I'm about 50% heavier than my girlfriend. If you assume that weight is
> proportional to sail size, she should be as powered on a 3.5 as I am on a
> 5.3. That doesn't seem to quite reflect reality. What am I missing?


 
 
 

sailor weight vs sail size

Post by BDSincla » Thu, 22 Jun 2000 04:00:00

Quote:
>How does sailor weight relate to sail size?
>I'm about 50% heavier than my girlfriend. If you assume that weight is
>proportional to sail size, she should be as powered on a 3.5 as I am on a
>5.3. That doesn't seem to quite reflect reality. What am I missing?
>R!

OK, way out of my realm here, especially since half the folks on this NG seem
to be engineers.  Sounds like your thinking F=ma.  Try instead looking at drag
force at steady state which is  mostly cross sectional area and coefficient of
drag.
bs

 
 
 

sailor weight vs sail size

Post by sandri.. » Fri, 23 Jun 2000 04:00:00

I've always wondered if a formula could be applied.  I agree it would
have to factor boyancy of the board (and width, fin size, keeping skill
constant) but if you could control for board size (both heavy and light
sailors on boards that do the same thing for each of them), what then
would be the relationship between sail area and sailor weight?

I like to sail my new 7.5 when everyone else is on 5.5's-6.0s. Its
design makes it fun and easy.  Square meters seem to be irrelavant.  So
if the sail is good enough and downhauled enough, and your talking a
significant modification to the forces it generates.

Steve



Quote:
> >How does sailor weight relate to sail size?
> >I'm about 50% heavier than my girlfriend. If you assume that weight
is
> >proportional to sail size, she should be as powered on a 3.5 as I am
on a
> >5.3. That doesn't seem to quite reflect reality. What am I missing?
> >R!

> OK, way out of my realm here, especially since half the folks on this
NG seem
> to be engineers.  Sounds like your thinking F=ma.  Try instead
looking at drag
> force at steady state which is  mostly cross sectional area and
coefficient of
> drag.
> bs

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