Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old October 20th 03, 01:30 AM
Parallax
 
Posts: n/a
Default Knotmeter

A

Useless Idea #3729
s Y'all know, I dislike expensive gadgets and that extends to knotlogs
with their always fouling impellers but I would really like a
knotmeter that will help me really tell when my sail trimming is
helping (I admit, I really can't tell most of the time) and the
response time of even GPS is suspect. However, my little "KNotstik"
that drags a weighted drag behind with a spring in a cylinder has TOO
SHORT a response time and responds to every wave that passes. So, I
propose to give he Knotstik a longer response time by making the
indicator fit tighter in the cylinder and closing off the end through
the cord with the drag passes making it a sort of damper with air as
the damping fluid. This way, it doesnt respond to very fast
transients but only to longer increases in speed.

Any better ideas?

  #2   Report Post  
Old October 20th 03, 02:14 PM
Wim
 
Posts: n/a
Default Knotmeter



"Parallax" wrote in message
m...
: A
:
: Useless Idea #3729
: s Y'all know, I dislike expensive gadgets and that extends to knotlogs
: with their always fouling impellers but I would really like a
: knotmeter that will help me really tell when my sail trimming is
: helping (I admit, I really can't tell most of the time) and the
: response time of even GPS is suspect. However, my little "KNotstik"
: that drags a weighted drag behind with a spring in a cylinder has TOO
: SHORT a response time and responds to every wave that passes. So, I
: propose to give he Knotstik a longer response time by making the
: indicator fit tighter in the cylinder and closing off the end through
: the cord with the drag passes making it a sort of damper with air as
: the damping fluid. This way, it doesnt respond to very fast
: transients but only to longer increases in speed.
:
: Any better ideas?


No, but just enjoy yourself !

c ya Wim
www.cruising.ca/thousand/f-index.html


  #3   Report Post  
Old October 20th 03, 02:29 PM
DSK
 
Posts: n/a
Default Knotmeter

Parallax wrote:

.....I would really like a
knotmeter that will help me really tell when my sail trimming is
helping (I admit, I really can't tell most of the time) ....

Any better ideas?


Yes. Hop into a high performance racing type dinghy like a 505 or a
Johnson 18. After you learn to *really* sail, you won't need a knotmeter
to tell when your sail trim is good.

Fresh Breezes- Doug King


  #5   Report Post  
Old October 20th 03, 03:54 PM
Jack Rye
 
Posts: n/a
Default Knotmeter

My advise to know when your sail trimming is correct. Would be to join a
racing club. Not only will you get the maximum speed. You will also learn
how to sail at peak performance all the time.
Buy a bung and clean your impeller often. Then bung keeps the water from
gushing in when you remove the impeller from the thru hull.

Jack
"Parallax" wrote in message
m...
A

Useless Idea #3729
s Y'all know, I dislike expensive gadgets and that extends to knotlogs
with their always fouling impellers but I would really like a
knotmeter that will help me really tell when my sail trimming is
helping (I admit, I really can't tell most of the time) and the
response time of even GPS is suspect. However, my little "KNotstik"
that drags a weighted drag behind with a spring in a cylinder has TOO
SHORT a response time and responds to every wave that passes. So, I
propose to give he Knotstik a longer response time by making the
indicator fit tighter in the cylinder and closing off the end through
the cord with the drag passes making it a sort of damper with air as
the damping fluid. This way, it doesnt respond to very fast
transients but only to longer increases in speed.

Any better ideas?





  #6   Report Post  
Old October 21st 03, 01:37 AM
Jere Lull
 
Posts: n/a
Default Knotmeter

Parallax wrote:

A

Useless Idea #3729
s Y'all know, I dislike expensive gadgets and that extends to knotlogs
with their always fouling impellers but I would really like a
knotmeter that will help me really tell when my sail trimming is
helping (I admit, I really can't tell most of the time) and the
response time of even GPS is suspect. However, my little "KNotstik"
that drags a weighted drag behind with a spring in a cylinder has TOO
SHORT a response time and responds to every wave that passes. So, I
propose to give he Knotstik a longer response time by making the
indicator fit tighter in the cylinder and closing off the end through
the cord with the drag passes making it a sort of damper with air as
the damping fluid. This way, it doesnt respond to very fast
transients but only to longer increases in speed.

Any better ideas?


We have GPS and knotmeter. We remove the knotmeter and install the blank
plug while we're away from the boat, so it's usually clear. I can change
over without shipping more than a cup or two of water.

The knotmeter is probably the most effective measure of relative speed
when you tweak things. The GPS reads a bit faster, but measures speed
over ground, which is a good indication of whether you're pointing the
right direction, but isn't as important as speed through the water (in
my opinion.) Additionally, the GPS can sometimes go "wonky" for a few
minutes.

The problem with the knotstick is that you can't see it while you're
looking forward at the sails. The knotmeter and GPS are usually closer
to normal eyesight.

Frankly, the best indicators are the telltales on the sails. They give
instant feedback on your set, no matter what the wind's doing. When I am
trying to get speed, I look at the telltales first, the knotmeter
second, and the GPS last. [Somewhere in there is my wife's expression;
if distressed, we reef quickly.]

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

  #7   Report Post  
Old October 22nd 03, 03:32 PM
Giles
 
Posts: n/a
Default Knotmeter

Any better ideas?

I use a little self-powered portable knotmeter that is rather like an
electronic update on a Walker log. It's sold by Speedtech (
http://www.speedtech.com/asp/prodtype.asp?prodtype=35 ). Its life
isn't as long as I'd like (wore the first one out in four seasons) but
it works well, is portable and is only expensive (as opposed to REALLY
expensive). The big advantage for me is that it involves no
installation (other than throwing the trailing wire over the side) and
no holes in the boat.

Giles Morris
  #8   Report Post  
Old October 23rd 03, 01:51 AM
Ryk
 
Posts: n/a
Default Knotmeter

On Mon, 20 Oct 2003 07:54:29 -0700, in message
[email protected]
"Jack Rye" .# wrote:

My advise to know when your sail trimming is correct. Would be to join a
racing club. Not only will you get the maximum speed. You will also learn
how to sail at peak performance all the time.


Racing will help sharpen skills, however, getting peak performance out
of a boat usually requires some good instruments to figure out what
works best for which boat under which conditions.

Ryk

  #9   Report Post  
Old October 27th 03, 05:42 PM
fraggy
 
Posts: n/a
Default Knotmeter

how do u find the time to sail looking at all the instruments?



"Parallax" wrote in message
m...
A

Useless Idea #3729
s Y'all know, I dislike expensive gadgets and that extends to knotlogs
with their always fouling impellers but I would really like a
knotmeter that will help me really tell when my sail trimming is
helping (I admit, I really can't tell most of the time) and the
response time of even GPS is suspect. However, my little "KNotstik"
that drags a weighted drag behind with a spring in a cylinder has TOO
SHORT a response time and responds to every wave that passes. So, I
propose to give he Knotstik a longer response time by making the
indicator fit tighter in the cylinder and closing off the end through
the cord with the drag passes making it a sort of damper with air as
the damping fluid. This way, it doesnt respond to very fast
transients but only to longer increases in speed.

Any better ideas?





Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cheap and Nasty Knotmeter Lloyd Sumpter General 9 January 23rd 04 07:46 AM


All times are GMT +1. The time now is 11:07 AM.

Powered by vBulletin® Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright 2004-2020 BoatBanter.com.
The comments are property of their posters.
 

About Us

"It's about Boats"

 

Copyright © 2017