## Now here is something crazy!

### Now here is something crazy!

If we assume that board-drag is proportional to water viscosity and
inversely prop. to density (denser: greater buoyancy, less wetted
surface), we find that in nearly boiling water you'd travel about 6
times faster than in nearly freezing water. (There is something
worthwhile looking forward to in hell...) If these assumptions are
correct, the ratio of drags in 15 degC to 25 degC water is about 1.25.
(Poor arctic windsurfers...)
_____________________________________________________________________
Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

tel/fax: 61-2-9451-2478|      ICQ: 1032408
Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>

### Now here is something crazy!

If you are planing, then the buoyancy is not really the issue, and skin
friction drag becomes the primary drag producer, which is more closely
related to viscosity, which hardly changes in that temperature range.

Rob

: If we assume that board-drag is proportional to water viscosity and
: inversely prop. to density (denser: greater buoyancy, less wetted
: surface), we find that in nearly boiling water you'd travel about 6
: times faster than in nearly freezing water. (There is something
: worthwhile looking forward to in hell...) If these assumptions are
: correct, the ratio of drags in 15 degC to 25 degC water is about 1.25.
: (Poor arctic windsurfers...)
: _____________________________________________________________________
: Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

: tel/fax: 61-2-9451-2478|      ICQ: 1032408
: Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>

### Now here is something crazy!

Quote:

>(There is something
>worthwhile looking forward to in hell...)

If it's really as hot down there as it looks, there water is probably all steam
and most boards will have melted. Besides I bet ol' Satan will have killed all
the wind anyway. Do you really think he's going to let us enjoy ourselves? I
cannot imagine the wind actually being better down there than it is up here.
Besides I bet monofilm wont last anytime down there, in or out of the flames.
My guess is that he wont let us carry our gear when we go. We'd probably have
to rent and I'd imagine the gear selection is pretty poor there.

### Now here is something crazy!

.....Sorry Glen, you've got it all wrong mate...

The gear 'down there' is first class, state of the art stuff...

Trouble is, there is only ONE sail, ONE board, ONE mast...etc etc..

There is NO water, only excrement, and everyone stands in it up to their
bottom lip...

Each windsurfer gets a turn to sail the gear, but everyone pleads for
him/her not to make any waves !!!!

That's the 'HELL' of it mate...

R.

--
Website: www.botanybay.cjb.net

Quote:

> >(There is something
> >worthwhile looking forward to in hell...)

> If it's really as hot down there as it looks, there water is probably all
steam
> and most boards will have melted. Besides I bet ol' Satan will have killed
all
> the wind anyway. Do you really think he's going to let us enjoy ourselves?
I
> cannot imagine the wind actually being better down there than it is up
here.
> Besides I bet monofilm wont last anytime down there, in or out of the
flames.
> My guess is that he wont let us carry our gear when we go. We'd probably
have
> to rent and I'd imagine the gear selection is pretty poor there.

### Now here is something crazy!

Why should we assume that board drag of a planing board is
proportional to water viscosity? I would assume an inverse
relationship because at cooler temperatures there are more H-bonded
globular clusters which are less available to interact with whatever
is traveling over the surface, and also less probable that the object
will penetrate the surface where it will experience magnitudes more
drag. This "theory" also works if we assume a thin film of water
clinging to the board's surface.  There is less interaction between
the board's water layer film and the water's surface.

Besides, they don't have wind in Hell anyway.

Ben

Quote:

>If we assume that board-drag is proportional to water viscosity and
>inversely prop. to density (denser: greater buoyancy, less wetted
>surface), we find that in nearly boiling water you'd travel about 6
>times faster than in nearly freezing water. (There is something
>worthwhile looking forward to in hell...) If these assumptions are
>correct, the ratio of drags in 15 degC to 25 degC water is about 1.25.
>(Poor arctic windsurfers...)
>_____________________________________________________________________
>Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

>tel/fax: 61-2-9451-2478|      ICQ: 1032408
>Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>

--
Ben Kaufman

Do not send SPAM. I will send it back to your de-hacked ISP
with a letter of complaint. Section 301 does not apply because
you have been forewarned!
For all others, change the domain name to pobox

### Now here is something crazy!

You guys gotta get out a little more....

In Hell it will always be windy.  You just won't have any gear with you....

Quote:

> Why should we assume that board drag of a planing board is
> proportional to water viscosity? I would assume an inverse
> relationship because at cooler temperatures there are more H-bonded
> globular clusters which are less available to interact with whatever
> is traveling over the surface, and also less probable that the object
> will penetrate the surface where it will experience magnitudes more
> drag. This "theory" also works if we assume a thin film of water
> clinging to the board's surface.  There is less interaction between
> the board's water layer film and the water's surface.

> Besides, they don't have wind in Hell anyway.

> Ben

> >If we assume that board-drag is proportional to water viscosity and
> >inversely prop. to density (denser: greater buoyancy, less wetted
> >surface), we find that in nearly boiling water you'd travel about 6
> >times faster than in nearly freezing water. (There is something
> >worthwhile looking forward to in hell...) If these assumptions are
> >correct, the ratio of drags in 15 degC to 25 degC water is about 1.25.
> >(Poor arctic windsurfers...)
> >_____________________________________________________________________
> >Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

> >tel/fax: 61-2-9451-2478|      ICQ: 1032408
> >Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>

> --
> Ben Kaufman

> Do not send SPAM. I will send it back to your de-hacked ISP
> with a letter of complaint. Section 301 does not apply because
> you have been forewarned!
> For all others, change the domain name to pobox

### Now here is something crazy!

Quote:

>If you are planing, then the buoyancy is not really the issue, and skin
>friction drag becomes the primary drag producer, which is more closely
>related to viscosity, which hardly changes in that temperature range.

>Rob

Rob,
Just look up a table of water viscosity versus temperature. The facts
are there.
Peter
_____________________________________________________________________
Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

tel/fax: 61-2-9451-2478|      ICQ: 1032408
Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>

### Now here is something crazy!

Dont feel sorry for us "arctic" windsurfers! There is SO much power in cold
winds! Right now it is approx. 0 degrees Celsius here in Denmark, and the
windsurfing is GREAT!!! (But - admitted - a bit chilly)

Jakob

Quote:
> If we assume that board-drag is proportional to water viscosity and
> inversely prop. to density (denser: greater buoyancy, less wetted
> surface), we find that in nearly boiling water you'd travel about 6
> times faster than in nearly freezing water. (There is something
> worthwhile looking forward to in hell...) If these assumptions are
> correct, the ratio of drags in 15 degC to 25 degC water is about 1.25.
> (Poor arctic windsurfers...)
> _____________________________________________________________________
> Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

> tel/fax: 61-2-9451-2478|      ICQ: 1032408
> Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>

### Now here is something crazy!

Quote:

>Dont feel sorry for us "arctic" windsurfers! There is SO much power in cold
>winds! Right now it is approx. 0 degrees Celsius here in Denmark, and the
>windsurfing is GREAT!!! (But - admitted - a bit chilly)

>Jakob

Thanks Jakob,

Cold air is more dense, so its energy is correspondingly greater. Good
luck up there (from here Downunder).
Peter
_____________________________________________________________________
Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

tel/fax: 61-2-9451-2478|      ICQ: 1032408
Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>

### Now here is something crazy!

You are right.

I was confusing two drag sources here. Skin friction is proportional to the
wetted area, density, and a friction coefficient which depends on your
board's surface. As water temp drops below about 4 degrees C, its density
actually decreases, so if you are planing, drag would REDUCE.

The drag caused by water shearing degrees itself is dependent on viscosity,
and I can't remember for the life of me what that's called. Somebody help
here! Let's call it "viscous" drag for now!

Rob

: If you are planing, then the buoyancy is not really the issue, and skin
: friction drag becomes the primary drag producer, which is more closely
: related to viscosity, which hardly changes in that temperature range.
:
: Rob
:

: : If we assume that board-drag is proportional to water viscosity and
: : inversely prop. to density (denser: greater buoyancy, less wetted
: : surface), we find that in nearly boiling water you'd travel about 6
: : times faster than in nearly freezing water. (There is something
: : worthwhile looking forward to in hell...) If these assumptions are
: : correct, the ratio of drags in 15 degC to 25 degC water is about 1.25.
: : (Poor arctic windsurfers...)
: : Peter (ready for flames)
: : _____________________________________________________________________
: : Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

: : tel/fax: 61-2-9451-2478|      ICQ: 1032408
: : Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>
:
:

### Now here is something crazy!

I think you should go windsurfing in water that's below 0 degrees Celsius,
that will probably reduce the board's drag and wetted surface!
Cee Ya

Benjamin Kaufman heeft geschreven in bericht ...

Quote:
>Why should we assume that board drag of a planing board is
>proportional to water viscosity? I would assume an inverse
>relationship because at cooler temperatures there are more H-bonded
>globular clusters which are less available to interact with whatever
>is traveling over the surface, and also less probable that the object
>will penetrate the surface where it will experience magnitudes more
>drag. This "theory" also works if we assume a thin film of water
>clinging to the board's surface.  There is less interaction between
>the board's water layer film and the water's surface.

### Now here is something crazy!

THE WINTER MUST HAVE BEEN A LONG ONE!!!   For these poor souls are now working
on math problems instead of fine tuning and relocating there lost windsurfing
equipment for the Coming of SPRING!!!!!!!!!  8-)

Quote:

> You are right.

> I was confusing two drag sources here. Skin friction is proportional to the
> wetted area, density, and a friction coefficient which depends on your
> board's surface. As water temp drops below about 4 degrees C, its density
> actually decreases, so if you are planing, drag would REDUCE.

> The drag caused by water shearing degrees itself is dependent on viscosity,
> and I can't remember for the life of me what that's called. Somebody help
> here! Let's call it "viscous" drag for now!

> Rob

> : If you are planing, then the buoyancy is not really the issue, and skin
> : friction drag becomes the primary drag producer, which is more closely
> : related to viscosity, which hardly changes in that temperature range.
> :
> : Rob
> :

> : : If we assume that board-drag is proportional to water viscosity and
> : : inversely prop. to density (denser: greater buoyancy, less wetted
> : : surface), we find that in nearly boiling water you'd travel about 6
> : : times faster than in nearly freezing water. (There is something
> : : worthwhile looking forward to in hell...) If these assumptions are
> : : correct, the ratio of drags in 15 degC to 25 degC water is about 1.25.
> : : (Poor arctic windsurfers...)
> : : Peter (ready for flames)
> : : _____________________________________________________________________
> : : Dr.Peter I Somlo FIEEE | M1: "Every coin has 3 sides - at least"

> : : tel/fax: 61-2-9451-2478|      ICQ: 1032408
> : : Mobile(AU):041-926-3168| <http://www.zeta.org.au/~somlo/default.htm>
> :
> :

--
Randy