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Speed of lead falling through the water (14 posts / 4,451 views)
Cadby17 Cadby17
Posts: 232
Post #1 13 Jul 2020 22:34
0
I've heard 3ft per second but can anyone verify/confirm this is somewhat accurate?

I assume there are a few variables that slightly alter the speed the lead falls at such as weight and shape. I typically use a 3oz flat pear, sometimes a distance/tournament lead.

I know the obvious answer is to go to a lake, plumb the depth and then count the lead down to work it out myself, but just wanted to know what some of you lot think?
yonny yonny
Posts: 7,934
Post #2 14 Jul 2020 09:24
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In reply to Post #1
The variables will have a huge influence mate, a 1 oz takes ages longer than a 3.
I think the only figure of any value would be speed in relation to weight (metres per second per ounce?) which I very much doubt you're going to get off anyone on here.

We are basically talking about terminal velocity.

You're a smarter man than me if you can work it out for a lead. See below for a steel ball.

https://physics.stackexchange.com/questions/190840/terminal-velocity-of-a-steel-ball-in-water
Tinhead Tinhead
Posts: 17,089
Post #3 14 Jul 2020 10:04
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In reply to Post #2
I know the obvious answer is to go to a lake, plumb the depth and then count the lead down to work it out myself,

That's all I can suggest to be fairly accurate
Jon Jon
Posts: 4,294
Post #4 14 Jul 2020 10:06
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I regularly fish in 13m (42ft), and I reckon that, with a 3 oz lead, I could probably fill the kettle, light the stove and get a brew going in the time it takes for the lead to hit the bottom.
Hope this helps.

BTW, even if you let the lead fall on a tight line, it certainly isn't a straight line between lead and rod tip as the lead hits bottom. With 0,40 mono, it's a big arc.
ocelot ocelot
Posts: 1,802
Post #5 14 Jul 2020 10:18
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In reply to Post #2
I've always worked on a second per oz per foot for working out deeper water. 3oz, 3 second drop, about 9 ft. Never been very far out but certainly no fact's to prove the above.
framey framey
Posts: 5,319
Post #6 14 Jul 2020 10:27
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In reply to Post #5
Same as this
yonny yonny
Posts: 7,934
Post #7 14 Jul 2020 10:30
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In reply to Post #5
I reckon I'm good to +/-1ft in depths of up to 12 ft with a 3 oz lead. Maybe +/-2 ft up to 18 ft.
But that's more experience than any methodical assessment.
NickGordon NickGordon
Posts: 3,121
Post #8 14 Jul 2020 11:38
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In reply to Post #5
I have put a marker float out and counted it up, then cast next to it and counted the lead down, usually with similar results, although I did have a very big difference on one lake in a particular swim. The gravel feature I had cast to had a shear drop right next to the marker, somehow I had landed the marker float right next to it.
The bottom in that swim was like an egg box! 5 feet straight down to 12.

As the OP said, the lead shape can have a slight effect, tournament or pear leads tend to drop faster than flattened leads or leads with a hole in the middle. The difference is miniscule though, not something you would notice by counting in your head.

When using a swimfeeder I always count it down, at 1 second per foot.
Halfcentury
Posts: 1,284
Post #9 14 Jul 2020 12:29
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Got to ask. If you are casting a lead out, why not use a marker float?
scozza
Posts: 18,421
Post #10 14 Jul 2020 13:40
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In reply to Post #1
In match circles 1 oz per foot per second counted in elephants, one elephant, two elephants, three...

I work to around a 3 foot per second with 2oz. To be fair though the only thing im looking for is variations in depth so i know in my head the lake bed in front of me
yonny yonny
Posts: 7,934
Post #11 14 Jul 2020 14:02
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In reply to Post #10
To be fair though the only thing im looking for is variations in depth so i know in my head the lake bed in front of me

Same here scozza. If the carp are there I couldn't really care less how deep it is, but its good to understand any feature(s). Only time I'll use a float is to determine accurate depth for zigs.
scozza
Posts: 18,421
Post #12 14 Jul 2020 16:22
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In reply to Post #11
Similar to me mate, all lead work, clear spots or depth variations
CarpHippy
Posts: 220
Post #13 15 Jul 2020 08:22
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You could try a bait boat with a fish finder. You will know the exact depth and can time it. Then clip up and cast to see how long the and you will have the depth. I would expect the cast lead to be a lot quicker than the boat dropped lead.
Baitman Baitman
Posts: 5,233
Post #14 16 Jul 2020 01:25
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The tension and diameter of the mainline will also have a big bearing on the speed of descent.
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