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Thread: Chum

  1. #21
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    Default Re: Chum

    Quote Originally Posted by noelex View Post

    Lead is the best material. As it is much denser a kilo of lead will have more effect than most other materials. The smaller size per kilo also makes handling easier.

    .
    I would hate to be thought of as being controversial and I am honestly fascinated.

    What is the science behind a kilo of lead being better than a kilo of say,. cast iron or even a kilo of aluminium.?

    Jonathan

  2. #22
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    Default Re: Chum

    I can think of two good reasons for lead being better then iron:

    - It doesn't go rusty, leaving dirty marks everywhere and being unpleasant to handle.
    - Being softer, albeit denser, when dropped on deck it is marginally less likely to make a dent.

    But aluminium trumps it on both these counts if the corners are well radiused.

    However, use zinc and you could also claim that it was protecting the chain! :0)

  3. #23
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    Default Re: Chum

    For a start,

    a kilo of Aluminium will be huge compared to lead; and alloy corrodes, lead doesn't.

    Apart from those major differences they're the same
    Anderson 22 Owners Association - For info please ask here or PM me.

  4. #24
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    Default Re: Chum

    Quote Originally Posted by Neeves View Post
    I would hate to be thought of as being controversial and I am honestly fascinated.

    What is the science behind a kilo of lead being better than a kilo of say,. cast iron or even a kilo of aluminium.?

    Jonathan
    A kilo of lead has a density of 11.3 kg/l, so a volume of 0.088 l. That volume displaces 0.088 kg of water, so the effective mass of the lead in water is 0.912 kg. For aluminium with density 2.7 kg/l the effective mass of a kg in water is 0.63 kg.

  5. #25
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    Default Re: Chum

    Quote Originally Posted by Seajet View Post
    ...alloy corrodes, lead doesn't.
    Let me update you on the advances in aluminium metallurgy since about 1950...

    "...some aluminium alloys corrode in seawater, while others do not..."

  6. #26
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    Default Re: Chum

    Brilliant sounding right on PC and wrong as always, thanks for a much needed laugh Angus
    Last edited by Seajet; 06-06-19 at 07:47.
    Anderson 22 Owners Association - For info please ask here or PM me.

  7. #27
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    Default Re: Chum

    Quote Originally Posted by Seajet View Post
    Brilliant sounding right on PC and wrong as always, thanks for a much needed laugh Angus
    No idea what you are on about. Are you still confused about relative densities and different weights of different density materials when displacing a fluid? Here's a quick link that might help relieve your befuddled state...

    https://en.wikipedia.org/wiki/Archimedes%27_principle
    Andersen 22. The best winch never made.
    miniwinwm.wixsite.com/miniwinwm

  8. #28
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    Sep 2001
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    Home - Sothampton, Boat - Gosport
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    Default Re: Chum

    Quote Originally Posted by AngusMcDoon View Post
    A kilo of lead has a density of 11.3 kg/l, so a volume of 0.088 l. That volume displaces 0.088 kg of water, so the effective mass of the lead in water is 0.912 kg. For aluminium with density 2.7 kg/l the effective mass of a kg in water is 0.63 kg.
    That's the bit that matters.

    Personally, I've never used a chum, I prefer to have the extra weight in my anchor. I've just swapped my 17m of 8mm chain for the same length of 6mm, which weighs around 2/3 as much - important on a small boat without a windlass, especially following an illness that has sapped my strength, and I carry an extra length of chain that I can add in when needed.

    The chain is possibly a little undersized for a solidly built 24 footer, but with a bit of rope out as well, I can't see me ever having to anchor in conditions that will put over a tonne of load on my anchor.
    Steve
    Never believe anything until it has been officially denied.

  9. #29
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    Default Re: Chum

    Quote Originally Posted by Stemar View Post
    Personally, I've never used a chum, I prefer to have the extra weight in my anchor.
    I'm not an anchor expert, but I suspect that if you want to carry extra metal around, the best place to put it for ultimate holding when the weather gets gnarly is in a larger anchor.
    Andersen 22. The best winch never made.
    miniwinwm.wixsite.com/miniwinwm

  10. #30
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    Sep 2010
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    Default Re: Chum

    I'm not an anchor expert

    Which clearly shows Angus, now let us men get on with proper advice
    Anderson 22 Owners Association - For info please ask here or PM me.

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