Re: [bolger] Re: Knotmeters
Well, yeah. And measures 'over the ground' more easily to boot.
Mark
rlspell2000 wrote:
Mark
rlspell2000 wrote:
>
> I paid $35 for my GPS, and it makes a fine knotmeter.
Jack,
I don't find a nautical manometer anywhere on the net,
except for one antique with a pair of dials that kinda
caught my eye. The ones I had in mind once came from Davis
Instruments. While they still have the wonderful plastic
student sextants, for measuring your speed, they are way
past this.
I'm going to slap together a pvc pipe version of Peter
Compton's, but need to make some other progress first. (
Just got a gift of trailer, and etc. )
I'll let you know later how it works.
x x
x x
x x
x x
xxxxxxxxxxxxxxxxxxx
x x
xxxxxxxxxxxxxxxxxxx
Mark
Jack Niewoehner wrote:
I don't find a nautical manometer anywhere on the net,
except for one antique with a pair of dials that kinda
caught my eye. The ones I had in mind once came from Davis
Instruments. While they still have the wonderful plastic
student sextants, for measuring your speed, they are way
past this.
I'm going to slap together a pvc pipe version of Peter
Compton's, but need to make some other progress first. (
Just got a gift of trailer, and etc. )
I'll let you know later how it works.
x x
x x
x x
x x
xxxxxxxxxxxxxxxxxxx
x x
xxxxxxxxxxxxxxxxxxx
Mark
Jack Niewoehner wrote:
>
> Hi Mark,
> Isn't it great to have a pile of old WoodenBoat
> magazines. I bought a pile
> of them on eBay this winter and had recently read the
> article on making the
> knot meter, so I remembered it.
> Considering the small response to your request about info
> on the knot
> meter, I don't think anyone is going to make any money
> manufacturing them. :-)
> Maybe we should manufacture I60's. ;-)
> Jack Niewoehner, Waiting impatiently for warmer weather
> so he can get
> back to building his Bolger Bobcat
I paid $35 for my GPS, and it makes a fine knotmeter.
--- In bolger@y..., "rnlocnil" <lincolnr@m...> wrote:
> Considering the way electronics costs have gone lately, I almost
> wonder if a laser doppler anemometer wouldn't make a good and cheap
> knot meter. Maybe a good wind meter too. I don't know what's
involved
> in the receiving part, tho. But there's a laser at every checkout
> counter these days. Is there an electronics hacker out there who
can
> tell me why this is crazy?
> --- In bolger@y..., Jack Niewoehner <ne1r@a...> wrote:
> > Hi Mark,
> > Isn't it great to have a pile of old WoodenBoat magazines. I
bought
> a pile
> > of them on eBay this winter and had recently read the article on
> making the
> > knot meter, so I remembered it.
> > Considering the small response to your request about info on the
> knot
> > meter, I don't think anyone is going to make any money
manufacturing
> them. :-)
> > Maybe we should manufacture I60's. ;-)
> > Jack Niewoehner, Waiting impatiently for warmer weather so he
can
> get
> > back to building his Bolger Bobcat
> >
> >
> > Mark wrote:
> > >Oh, thanks for this, Jack. I've got #111 in the pile! A
> > >Manometer, eh?
> > The thing is remarkably simple. Hand held with a plastic
> > pipe sensor ought to work just fine. Maybe we should go into
> > business producing them and make our first or second million.
Considering the way electronics costs have gone lately, I almost
wonder if a laser doppler anemometer wouldn't make a good and cheap
knot meter. Maybe a good wind meter too. I don't know what's involved
in the receiving part, tho. But there's a laser at every checkout
counter these days. Is there an electronics hacker out there who can
tell me why this is crazy?
wonder if a laser doppler anemometer wouldn't make a good and cheap
knot meter. Maybe a good wind meter too. I don't know what's involved
in the receiving part, tho. But there's a laser at every checkout
counter these days. Is there an electronics hacker out there who can
tell me why this is crazy?
--- In bolger@y..., Jack Niewoehner <ne1r@a...> wrote:
> Hi Mark,
> Isn't it great to have a pile of old WoodenBoat magazines. I bought
a pile
> of them on eBay this winter and had recently read the article on
making the
> knot meter, so I remembered it.
> Considering the small response to your request about info on the
knot
> meter, I don't think anyone is going to make any money manufacturing
them. :-)
> Maybe we should manufacture I60's. ;-)
> Jack Niewoehner, Waiting impatiently for warmer weather so he can
get
> back to building his Bolger Bobcat
>
>
> Mark wrote:
> >Oh, thanks for this, Jack. I've got #111 in the pile! A
> >Manometer, eh?
> The thing is remarkably simple. Hand held with a plastic
> pipe sensor ought to work just fine. Maybe we should go into
> business producing them and make our first or second million.
Hi Mark,
Isn't it great to have a pile of old WoodenBoat magazines. I bought a pile
of them on eBay this winter and had recently read the article on making the
knot meter, so I remembered it.
Considering the small response to your request about info on the knot
meter, I don't think anyone is going to make any money manufacturing them. :-)
Maybe we should manufacture I60's. ;-)
Jack Niewoehner, Waiting impatiently for warmer weather so he can get
back to building his Bolger Bobcat
Mark wrote:
pipe sensor ought to work just fine. Maybe we should go into
business producing them and make our first or second million.
Isn't it great to have a pile of old WoodenBoat magazines. I bought a pile
of them on eBay this winter and had recently read the article on making the
knot meter, so I remembered it.
Considering the small response to your request about info on the knot
meter, I don't think anyone is going to make any money manufacturing them. :-)
Maybe we should manufacture I60's. ;-)
Jack Niewoehner, Waiting impatiently for warmer weather so he can get
back to building his Bolger Bobcat
Mark wrote:
>Oh, thanks for this, Jack. I've got #111 in the pile! AThe thing is remarkably simple. Hand held with a plastic
>Manometer, eh?
pipe sensor ought to work just fine. Maybe we should go into
business producing them and make our first or second million.
Jack,
The thing is remarkably simple. Hand held with a plastic
pipe sensor ought to work just fine. Maybe we should go into
business producing them and make our first or second million.
Mark
Jack Niewoehner wrote:
The article actually shows how to make
The thing is remarkably simple. Hand held with a plastic
pipe sensor ought to work just fine. Maybe we should go into
business producing them and make our first or second million.
Mark
Jack Niewoehner wrote:
The article actually shows how to make
> one that you
> attach to the hull, but I suppose you could make it hand
> held..
Oh, thanks for this, Jack. I've got #111 in the pile! A
Manometer, eh?
The article shows the classic formula:
LENGTH ( in feet ) / TIME ( in seconds ) x .59 = SPEED (
in knots )
Mark
Jack Niewoehner wrote:
Manometer, eh?
The article shows the classic formula:
LENGTH ( in feet ) / TIME ( in seconds ) x .59 = SPEED (
in knots )
Mark
Jack Niewoehner wrote:
>
> Hi Mark,
> WoodenBoat Magazine had an article on making one of these
> in issue #111,
> March/April 1993. The article actually shows how to make
> one that you
> attach to the hull, but I suppose you could make it hand
> held. I could
> send you more info if you send me your e-mail address.
> Jack Niewoehner
>ne1r@...
>
> Mark wrote:
> >In the era of the $100 GPS this may seem a little
> goofy...
> >
> >Does anyone know where to find the old fashioned type of
> >knotmeter that you hand-dip in the water? I think they
> had a
> >little ball that rises in a tube.
> >
> >I'm moving up from chip logs.
> >Mark
Hi Mark,
WoodenBoat Magazine had an article on making one of these in issue #111,
March/April 1993. The article actually shows how to make one that you
attach to the hull, but I suppose you could make it hand held. I could
send you more info if you send me your e-mail address.
Jack Niewoehner
ne1r@...
Mark wrote:
WoodenBoat Magazine had an article on making one of these in issue #111,
March/April 1993. The article actually shows how to make one that you
attach to the hull, but I suppose you could make it hand held. I could
send you more info if you send me your e-mail address.
Jack Niewoehner
ne1r@...
Mark wrote:
>In the era of the $100 GPS this may seem a little goofy...
>
>Does anyone know where to find the old fashioned type of
>knotmeter that you hand-dip in the water? I think they had a
>little ball that rises in a tube.
>
>I'm moving up from chip logs.
>Mark
Stuart,
The chip log is somewhat similar, though not as semantically
interesting. With something that floats tied to the end of
the rope, you watch it go by and count the seconds. There's
an elegant formula in Bowditch I can't recall, but in my 16'
boat if it takes about 5 seconds from bow to stern I'm
making 2 knots. ( Must be 1.687 ft/sec = 1 knot/hr )
Mark
Stuart Crawford wrote:
The chip log is somewhat similar, though not as semantically
interesting. With something that floats tied to the end of
the rope, you watch it go by and count the seconds. There's
an elegant formula in Bowditch I can't recall, but in my 16'
boat if it takes about 5 seconds from bow to stern I'm
making 2 knots. ( Must be 1.687 ft/sec = 1 knot/hr )
Mark
Stuart Crawford wrote:
>
> on 24/3/02 4:07 PM, Mark Albanese atmarka@...
> wrote:
> can't help here, but as a note of possible interest. the
> original log
> consisted of a piece of board which was tied to a length
> of line, which had
> knots tied at regular intervals. the board was released
> overboard and the
> number of knots that feed out at a timed interval gave the
> indication of
> speed. Hence the name for nautical speed being knots.
>
> Stuart Crawford
> New Zealand
>
> > In the era of the $100 GPS this may seem a little
> goofy...
> >
> > Does anyone know where to find the old fashioned type of
> > knotmeter that you hand-dip in the water? I think they
> had a
> > little ball that rises in a tube.
> >
> > I'm moving up from chip logs.
> > Mark
>
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on 24/3/02 4:07 PM, Mark Albanese atmarka@...wrote:
can't help here, but as a note of possible interest. the original log
consisted of a piece of board which was tied to a length of line, which had
knots tied at regular intervals. the board was released overboard and the
number of knots that feed out at a timed interval gave the indication of
speed. Hence the name for nautical speed being knots.
Stuart Crawford
New Zealand
can't help here, but as a note of possible interest. the original log
consisted of a piece of board which was tied to a length of line, which had
knots tied at regular intervals. the board was released overboard and the
number of knots that feed out at a timed interval gave the indication of
speed. Hence the name for nautical speed being knots.
Stuart Crawford
New Zealand
> In the era of the $100 GPS this may seem a little goofy...
>
> Does anyone know where to find the old fashioned type of
> knotmeter that you hand-dip in the water? I think they had a
> little ball that rises in a tube.
>
> I'm moving up from chip logs.
> Mark
In the era of the $100 GPS this may seem a little goofy...
Does anyone know where to find the old fashioned type of
knotmeter that you hand-dip in the water? I think they had a
little ball that rises in a tube.
I'm moving up from chip logs.
Mark
Does anyone know where to find the old fashioned type of
knotmeter that you hand-dip in the water? I think they had a
little ball that rises in a tube.
I'm moving up from chip logs.
Mark