Chris Newport wrote:

On Wednesday 25 August 2004 12:26 am in rec.boats.cruising Parallax wrote:


A related issue is that most sailboats have a fairly small engine
intended only to get the boat up to hull speed in calm water. Putting
in a larger engine would be considered wasteful because then the boat
would have to always carry around that heavier engine even when it
wasnt needed. Is it possible to temporarily increase the power
outpuit of a small engine by some means, perhaps a blower, a turbo or
even using NOS? This might give the sailboat the ability to better
motor off a lee shore in strong winds, motor against a strong running
tide, etc. I am primarily interested in times when it is a safety
issue, not for convenience so potential engine damage might be
acceptable.


If the hull is not designed for planing under power you
will not be able exceed the hull speed, so more power is
a waste.

Twaddle.

More power = more speed. The hull speed calculation simply implies
what speed you might find most economical. Slower is cheaper, except
for time. Time is money. Kind of like relativity. Is time cheap?

Sail off of a lee shore. Don't buy a sailboat that can't. If it is
tough, even a little boost from an engine will make the difference.
When the wind comes up, reduce sail. Too much wind power makes a
sailboat difficult to maneuver. All boat hulls are sailboats. Most
sailboats can be sailed without their sails.

Look a little further up the road (seaway). Keep out of trouble
instead of trying to get out of trouble.

That's Pilot's rule #1!

Too bad automobiles don't follow the COLREGS! Pedestrians have the
right of way even on the water.

Terry K

Terry Spragg wrote:
Chris Newport wrote:
If the hull is not designed for planing under power you
will not be able exceed the hull speed, so more power is
a waste.

Twaddle.

More power = more speed.

This has an asymptotical limit, though.

Andreas.

--
Dr. Andreas F. Borchert, SAI, Universitaet Ulm | Habe Mut, dich deines
Helmholtzstrasse 18, E02, Tel +49 731 50-23572 | eigenen Verstandes zu
http://www.mathematik.uni-ulm.de/sai/borchert/ | bedienen! -- I. Kant

On Friday 27 August 2004 10:23 am in rec.boats.cruising Andreas Borchert
wrote:

Terry Spragg wrote:
Chris Newport wrote:
If the hull is not designed for planing under power you
will not be able exceed the hull speed, so more power is
a waste.

Twaddle.

More power = more speed.

This has an asymptotical limit, though.

Given enough thrust, pigs fly just fine; although this is
not necessarily a good idea.

--
My real address is crn (at) netunix (dot) com
WARNING all messages containing attachments or html will be silently
deleted. Send only plain text.

More power = more speed.

This has an asymptotical limit, though.

bull****, doc. you may well know what the the word "asymptotical" means but
you don't know squat about the shape of the power curve of a boat at or
anywhere near hull speed.



Andreas.

--
Dr. Andreas F. Borchert, SAI, Universitaet Ulm | Habe Mut, dich deines
Helmholtzstrasse 18, E02, Tel +49 731 50-23572 | eigenen Verstandes zu
http://www.mathematik.uni-ulm.de/sai/borchert/ | bedienen! -- I. Kant

More power = more speed.

This has an asymptotical limit, though.


JAXAshby wrote:
bull****, doc. you may well know what the the word "asymptotical" means but
you don't know squat about the shape of the power curve of a boat at or
anywhere near hull speed.

Why don't you explain it to us, Jaxxie?

Most of us could use a good laugh.

DSK

More power = more speed.

This has an asymptotical limit, though.


JAXAshby wrote:
bull****, doc. you may well know what the the word "asymptotical" means
but
you don't know squat about the shape of the power curve of a boat at or
anywhere near hull speed.

Why don't you explain it to us, Jaxxie?

Most of us could use a good laugh.

DSK

here you go, dougies.

as·ymp·tote ( P ) Pronunciation Key (sm-tt, -mp-)
n.
A line whose distance to a given curve tends to zero. An asymptote may or may
not intersect its associated curve

More power = more speed.

This has an asymptotical limit, though.

JAXAshby wrote:
you don't know squat about the shape of the power curve of a boat at or
anywhere near hull speed.

JAXAshby wrote:
as·ymp·tote ( P ) Pronunciation Key (sm-tt, -mp-)
n.
A line whose distance to a given curve tends to zero. An asymptote may or may
not intersect its associated curve

And you're saying that the power curve of a boat "at or near hull speed"
does not have an asymptote?

DSK

dougies, what word didn't you understand? I mean in addition to asymptote?

More power = more speed.

This has an asymptotical limit, though.

JAXAshby wrote:
you don't know squat about the shape of the power curve of a boat at or
anywhere near hull speed.

JAXAshby wrote:
as·ymp·tote ( P ) Pronunciation Key (sm-tt, -mp-)
n.
A line whose distance to a given curve tends to zero. An asymptote may or
may
not intersect its associated curve

And you're saying that the power curve of a boat "at or near hull speed"
does not have an asymptote?

DSK

"DSK" wrote in message
. ..
More power = more speed.

This has an asymptotical limit, though.

JAXAshby wrote:
you don't know squat about the shape of the power curve of a boat at or
anywhere near hull speed.

JAXAshby wrote:
as·ymp·tote ( P ) Pronunciation Key (sm-tt, -mp-)
n.
A line whose distance to a given curve tends to zero. An asymptote may
or may
not intersect its associated curve

And you're saying that the power curve of a boat "at or near hull speed"
does not have an asymptote?

No. As I have always learned it and according to the mathematic literature,
an asymptote will NEVER reach or cross it's associated curve. So if the
power curve of a boat would be an asymptote, the boat would never be able to
reach hull speed, which is not true. If you apply enough power, the speed
WILL get higher than hull speed.

Meindert

On Mon, 30 Aug 2004 07:33:32 -0400, DSK wrote:

More power = more speed.

This has an asymptotical limit, though.

JAXAshby wrote:
you don't know squat about the shape of the power curve of a boat at or
anywhere near hull speed.

JAXAshby wrote:
as·ymp·tote ( P ) Pronunciation Key (sm-tt, -mp-)
n.
A line whose distance to a given curve tends to zero. An asymptote may or may
not intersect its associated curve

And you're saying that the power curve of a boat "at or near hull speed"
does not have an asymptote?

I am puzzled. What quantity approaches an asymptote and against what
independent variable?


Rodney Myrvaagnes NYC


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