carabiner help

[monkey boy]

hi all
can anyone explain Kn on a carabiner, im looking for some to put on my hammock and found one thats arround 23KN but im not sure if that will hold my weight, im arround 84kg? All I need to know will it hold me really
thanx

 

[mountainm]

10KN=1000kg

 

[Robbi]

as the man says

 

[Kepis]

23Kn is 2.3 metric tonnes

 

[monkey boy]

wow ok so that should hold me fine

 

[Robbi]

unless you're a BIG lad !

 

[EdS]

23Kn is 2.3 metric tonnes

not quiet.Kg / tonne is a unit of mass n is a unit of force.

n = kg * m/s sq.

2.3t static loads

 

[Kepis]

not quiet.Kg / tonne is a unit of mass n is a unit of force.

n = kg * m/s sq.

2.3t static loads

But it works as an approximation for working out the strength of a biner to be used on a hammock

 

[Hugo]

Make sure they will take the forces of a Sammy sandwich.

 

[MattB]

But it works as an approximation for working out the strength of a biner to be used on a hammock

Indeed - static force is fine for working out a hammock, unless you're planning on jumping into it from a great height!

 

[The Cumbrian]

If you're still looking for carabiners, Needlesports often have good deals on lightweight carabiners.


Cheers, Michael.

 

[demographic]

Any proper climbing carabiner will be fine but the crappy things that middle management use like keyrings are good for nothing apart from middle management key hanging.
Jangle, Jangle, how's about that then boys and girls...

 

[monkey boy]

so do You think 2kn will be ok for my hammock, if it helps I weigh about 84kg?

 

[The Cumbrian]

Check these out:

http://www.needlesports.com/Catalog...eedle-Sports-Prowire-Krab-DMM-PW#.UAwHAHhZ4ZQ

 

[monkey boy]

Check these out:

http://www.needlesports.com/Catalog...eedle-Sports-Prowire-Krab-DMM-PW#.UAwHAHhZ4ZQ

they look really good in my price range to thanx for that

 

[Satyr]

so do You think 2kn will be ok for my hammock, if it helps I weigh about 84kg?

No because of the angle that you suspend your hammock from. If the angle from the load (you) to the anchor point (tree) is greater than 120 degrees then you place more weight on the anchor point - which will include your carabiner, than the weight of the load. So when we go for a nice flat hammock (180 degrees) the force we place on the anchor is way more than what we weigh. Of course the hammock is never completely horizontal but you get the idea, so using a weak crab that will only hold double your weight will probably not last very long.

 

[roger-uk]

No because of the angle that you suspend your hammock from. If the angle from the load (you) to the anchor point (tree) is greater than 120 degrees then you place more weight on the anchor point - which will include your carabiner, than the weight of the load. So when we go for a nice flat hammock (180 degrees) the force we place on the anchor is way more than what we weigh. Of course the hammock is never completely horizontal but you get the idea, so using a weak crab that will only hold double your weight will probably not last very long.

That does not sound right. If his weight is 84kg then where does the extra force come from

 

[monkey spanner]

Originally Posted by Satyr No because of the angle that you suspend your hammock from. If the angle from the load (you) to the anchor point (tree) is greater than 120 degrees then you place more weight on the anchor point - which will include your carabiner, than the weight of the load. So when we go for a nice flat hammock (180 degrees) the force we place on the anchor is way more than what we weigh. Of course the hammock is never completely horizontal but you get the idea, so using a weak crab that will only hold double your weight will probably not last very long.



That does not sound right. If his weight is 84kg then where does the extra force come from

Yeah, that don't sound right.
IF the biner was hanging straight down, with 2 strops holding the load, then the max spread between the 2 strops is 120 deg.
BUT seeing as the biner is IN-LINE with the load the weight passes straight through the biner, no matter what angle the hammock hanging gear is hanging from the tree.

 

[EdS]

That does not sound right. If his weight is 84kg then where does the extra force come from

Problem is you are thinknig in mass (load) not force. 84kg is mass (load), not force. The force on anchor point depends on a number of factors including angle and load.

A little light reading:
http://www.ropebook.com/information/vector-forces


Basically:
Force = load/cos angle x

 

[pastymuncher]

Here you go---http://www.ropebook.com/information/vector-forces

In theory if your hammock line was perfectly straight the force would be infinite, obviously this could never happen as it would bend even under its own weight.

Might help explain why some people end up on the floor though......


bugger beat me to it