Off the wall question: Underwater plumb bob?
 

I am going to test some anchors on our August trip to the BVI. This is
the second test and I learned a lot on the first one about what to do to
make it more accurate. To measure the set distance I need some means of
marking exactly the location that the anchor was dropped. I am
invisioning some sort of pointed weight with a boyant shaft that can be
dropped as the anchor is released. A float on a line will also give me
a refference point for the next test so I can be sure each anchor lands
in similar bottom.

Anyone ever seen such a device or have a better idea?


--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

Off the wall question: Underwater plumb bob?
 

On Tue, 27 Apr 2004 16:32:57 -0400, Glenn Ashmore
wrote:

Anyone ever seen such a device or have a better idea?

==================================================

This would be sort of expensive and hi-tech, but how about a fishing
bobber tied to a concrete block with monofilament line? Adjust the
length of the line so the bobber is just starting to be pulled under
to ensure accurate positioning.

Off the wall question: Underwater plumb bob?
 

On Tue, 27 Apr 2004 16:32:57 -0400, Glenn Ashmore
wrote:

Anyone ever seen such a device or have a better idea?

==================================================

This would be sort of expensive and hi-tech, but how about a fishing
bobber tied to a concrete block with monofilament line? Adjust the
length of the line so the bobber is just starting to be pulled under
to ensure accurate positioning.

Off the wall question: Underwater plumb bob?
 

Ever try to pack a concrete block? :-) I need something that will drop
straight and fast and most of all I can pack without adding much weight.
I am already carrying 110 pounds of anchors and need a little room for
a bathing suit and a toothbrush, :-)

Wayne.B wrote:
On Tue, 27 Apr 2004 16:32:57 -0400, Glenn Ashmore
wrote:


Anyone ever seen such a device or have a better idea?


==================================================

This would be sort of expensive and hi-tech, but how about a fishing
bobber tied to a concrete block with monofilament line? Adjust the
length of the line so the bobber is just starting to be pulled under
to ensure accurate positioning.


--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

Off the wall question: Underwater plumb bob?
 

Ever try to pack a concrete block? :-) I need something that will drop
straight and fast and most of all I can pack without adding much weight.
I am already carrying 110 pounds of anchors and need a little room for
a bathing suit and a toothbrush, :-)

Wayne.B wrote:
On Tue, 27 Apr 2004 16:32:57 -0400, Glenn Ashmore
wrote:


Anyone ever seen such a device or have a better idea?


==================================================

This would be sort of expensive and hi-tech, but how about a fishing
bobber tied to a concrete block with monofilament line? Adjust the
length of the line so the bobber is just starting to be pulled under
to ensure accurate positioning.


--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

Off the wall question: Underwater plumb bob?
 

Glenn Ashmore wrote:

Ever try to pack a concrete block? :-) I need something that will
drop straight and fast and most of all I can pack without adding much
weight. I am already carrying 110 pounds of anchors and need a little
room for a bathing suit and a toothbrush, :-)

How straight do you need? You could start off with the ball from a
trailer hitch (simple and cheap), or work your way up thru large lead
sinkers and the monofilament that Wayne mentioned.



--
"All we are given is possibilities -- to make ourselves one thing or another."
-- Ortega y Gasset

Off the wall question: Underwater plumb bob?
 

Glenn Ashmore wrote:

Ever try to pack a concrete block? :-) I need something that will
drop straight and fast and most of all I can pack without adding much
weight. I am already carrying 110 pounds of anchors and need a little
room for a bathing suit and a toothbrush, :-)

How straight do you need? You could start off with the ball from a
trailer hitch (simple and cheap), or work your way up thru large lead
sinkers and the monofilament that Wayne mentioned.



--
"All we are given is possibilities -- to make ourselves one thing or another."
-- Ortega y Gasset

Off the wall question: Underwater plumb bob?
 

"Glenn Ashmore" writes:

Anyone ever seen such a device or have a better idea?

IMHO, you can't get there from here with what you are considering.

Your friend will be a high speed, hand held GPS.

You won't get it for $100, but it will do the job.


--
Lew

S/A: Challenge, The Bullet Proof Boat, (Under Construction in the Southland)
Visit: http://home.earthlink.net/~lewhodgett for Pictures

Off the wall question: Underwater plumb bob?
 

"Glenn Ashmore" writes:

Anyone ever seen such a device or have a better idea?

IMHO, you can't get there from here with what you are considering.

Your friend will be a high speed, hand held GPS.

You won't get it for $100, but it will do the job.


--
Lew

S/A: Challenge, The Bullet Proof Boat, (Under Construction in the Southland)
Visit: http://home.earthlink.net/~lewhodgett for Pictures

Off the wall question: Underwater plumb bob?
 

I kinda like the trailer knobs and adjustable fishing bobbers. I have
accumulated several GPS units so getting back to the same general place
will not be a problem but these test have gotten a bit more complicated
than I first thought. last time we just duplicated the Practical Sailor
tests and got pretty much the same results. This time I want to measure
creep under loads 10-15% below where they drag, how far they sail from
the drop point and get more accurate mesurements on how far they take to
set. A lot of that requires mesurements in inches.

All this may seem a bit over the top but if I am selling these things I
want to know everything about them. Besides, I made a little profit on
the anchors last year and need to be able to show the tax man that 10
days in the BVI is a legitimate business expense. ;-)

Lew Hodgett wrote:
"Glenn Ashmore" writes:


Anyone ever seen such a device or have a better idea?


IMHO, you can't get there from here with what you are considering.

Your friend will be a high speed, hand held GPS.

You won't get it for $100, but it will do the job.



--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com