Double balls!

[Sgroves]

and while I'm at it, here's a really wierd one! in a controlled and carefully documented scientific experiment, I calculated that I needed two cork balls to support my boat/car keys, (actually, I put two on at once and bunged em in the pond to see if they'd float!) however, when they spontaneously hurled themselves from my zipped pocket into the marina this weekend, they sunk without trace. This raises a second issue, has anyone ever actually recovered anything with a sea searcher magnet?

Steve

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[oldgit]

your balls were obviously not BIG enough.........

<hr width=100% size=1>My little Princess/forums/images/icons/laugh.gifthe 33 of course.

 

[Sgroves]

but I can only just get them in my pocket as it is!

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[kingfisher]

Speaker magnet

We used the magnet we stripped from a 100W speaker to go dredging. We did find the sunken object.
Mind you, it was for a 2ft by 2 ft steel plate rudder, so a bunch of keys could be somewhat of a challenge.

"OK, secure rudder first, than remove retaining pin. Sounds logical"

<hr width=100% size=1>Group of people on the pontoon: skipper is the one with the toolbox.
http://sirocco31.tripod.com

 

[paulineb]

Could it be because the pond is freshwater and the marina is sea water - or am I being silly again?

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<A target="_blank" HREF=http://www.paulinebeddoes.co.uk/php-cgi/gallery>The Perils of Pauline in Pics</A>

 

[MedDreamer]

I think they should float better on saltwater as it is more bouyant - what a boring git I am turning into, I'll be doing pub quizes next!



<hr width=100% size=1>Martyn

 

[byron]

<font color=blue> Apply the following formula and your keys will not sink. It is quite simple but don't forget that the crucial effect is that of Kim's crutchpiece on his Y fronts.

1.    Define basic scientific vocabulary:  fluid, pressure, Pascal, buoyancy,
    density, airfoil, life, thrust, drag, vacuum.
2.    List the following units of measurement:

        1 atm = 100 000 Pa

        Pressure increases 100 000 Pa / 10m water depth
3.    Apply the following mathematical formulas:

        p = f/A

        d = m/v
4.    Explain how hydraulic brakes work.
5.    Assess the concept of buoyancy by:

        a) if object's weight > buoyant force, then the object sinks; and

        b) buoyant force = weight of fluid displaced (Archimedes Principle).
6.    Explain that weight of fluid displaced depends on volume of object
    submerged.
7.    Predict that if an object's density > fluid's density, then the object sinks.


<hr width=100% size=1>http://www.alexander-advertising.co.uk

 

[oldgit]

You bin at the turps again Mr B.

<hr width=100% size=1>My little Princess/forums/images/icons/laugh.gifthe 33 of course.

 

[jon_bailey]

I've seen a set of BMW car keys recovered with a sea searcher in less than 5 mins. These did not have floats attached and this could be your problem. Sinking slowly at near neutral buoyancy could have allowed them to drift and/or flutter some way.



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