How much does my 40kg anchor weigh in salt water

[DougH]

There is a thread running on Scuttlebutt about the about topic.

I'm not interested in the answer but I would like to know why he is asking the question.

Before anyone suggests I ask the OP I admit that Raggies scare me.

 

[BruceK]

Well the density of sea water is 1.025 and Fe is 7.87. So his anchor would weigh roughly 34.8 kg. However it's mass doesn't change.

Roggie probably doesn't have a working windlass and has to haul by hand.

 

[IDAMAY]

Must be quite a ship if it needs a 40kg anchor!

 

[BruceK]

Maybe its a belt and braces fella.

 

[omega2]

It's not the weight it's the shape that makes it work. an 80lb dustbin v's a 20lb delta? no contest. Stupid question either way.

 

[JerseyDiver]

It weighs nothing when it is placed where it should be........on the seabed!

 

[benjenbav]

I once owned a sailboat without a winch and, although the anchor was relatively small, my recollection was that it was blimmin heavy to haul up by hand.

 

[BruceK]

It weighs nothing when it is placed where it should be........on the seabed!

How do you work that one out?

 

[Montemar]

When it's on the seabed it weighs 40Kg and water, saline or otherwise, is irrelevant. When not on the seabed it is hanging from a chain and water blah blah blah....

 

[VicS]

Kilograms are the units of mass .... not weight

The units of weight are newtons (N)

A 40kg anchor has a mass of 40kg.


In air at the earths surface it weighs approx 392 N

In seawater it still has a mass of 40kg but it weighs approx 341 N

 

[BruceK]

I made a boo boo. Yes you are correct.

 

[grumpy_o_g]

It's not the weight it's the shape that makes it work. an 80lb dustbin v's a 20lb delta? no contest. Stupid question either way.

Alao mtters where the weight is - ideally in the tip. But it is a strange question...

 

[mlines]

Tell him he can save weight then by keeping it in a bucket of seawater on the deck