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Some nice Kiwi No 8 action going on here.

Marshy's has the edge on the rest, very clever :thumbup:

 

That would be only a 'small size' thimble though.

 

As a FYI - we just tested a few of the chinese made halyard shackles that look like those. Came up a lot better than expected and we think perfectly fine for anyone one knot pushing load boundaries hard who also has a smaller sized wallet. The numbers were well above what 99% would expect to need and knot at all far off the brand name versions, many of which are probably made in the same factory anyway :?

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Hey guys, you are cheating!

Don't you know we are supposed to buy as much brand name HW as possible?

:-)

 

But then I am also a sinner. I am known to have built my own blocks and I am not sure ball bearing blocks

are really superior to plain bearing bocks.

 

http://hem.bredband.net/b262106/Boat/Blockfriction.pdf

 

/Martin

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We had a "mylaska" type thing on GDT untill it jammed just above the hounds dropping the main in 25 knots of breeze. After Marshy shimmied up the rig and spend quite a while hanging on for his life trying to free it while we were in a fairly hairy spot near the harbour bridge Marshy replaced it with something far far better!!!

 

 

Hey guys, you are cheating!

Don't you know we are supposed to buy as much brand name HW as possible?

:-)

 

But then I am also a sinner. I am known to have built my own blocks and I am not sure ball bearing blocks

are really superior to plain bearing bocks.

 

http://hem.bredband.net/b262106/Boat/Blockfriction.pdf

 

/Martin

interesting read Martin. One thing that I was wondering, perhaps the BB blocks would show a better reading when under a higher load ( i.e. near max working load?) and also perhaps when they are running at high speed? all your tests were low speed tests

 

I would be interested to see how a proper block like the ser 57 Black Magic Harken with needle BB would fair in the tests.

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interesting read Martin. One thing that I was wondering, perhaps the BB blocks would show a better reading when under a higher load ( i.e. near max working load?) and also perhaps when they are running at high speed? all your tests were low speed tests

 

I would be interested to see how a proper block like the ser 57 Black Magic Harken with needle BB would fair in the tests.

Regarding higher load: That is on the wish list but my test set up is not up to it. The loads I have reached covers what you have on the line of a hand-operated tackle (as opposed to winch-operated).

 

Regarding the Harken blocks you mention: Please send some and I will test this winter.

:-)

 

But if internal friction in the line dominates, how much improvement can you get from the bearing of the block?

 

Note on Harken: Not all Harken blocks are ball bearing blocks. I have good experience with their wire blocks using them for my main sheet. They are plain bearing blocks, something I just found out reading their data sheet. The balls are only there to center the sheave between the side plates.

 

/Martin

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heres another version of the 2:1 haliyard shackle, retailing for around $99inc

I think the safe working load is 1500kg

takes up to 8mm rope I think.

Weighs 35 grams

Marshys weighs 125 grams

pm me for details on where to purchase one

 

you could also use it for other high load applications

DSC00090.JPG

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heres another version of the 2:1 haliyard shackle, retailing for around $99inc

I think the safe working load is 1500kg

takes up to 8mm rope I think.

Weighs 35 grams

Marshys weighs 125 grams

pm me for details on where to purchase one

 

you could also use it for other high load applications

 

What is the size of the shackle pin Sam ?

 

You need at least an 8mm pin in 17-4 to claim SWL of 1500 kg.

 

Normal s/s pin of 10mm has SWL of 1520 kg.

 

 

FYI The tylaska H5 has a SWL of 1136kg, a pin diam of 6.6mm, and weighs 36.9 gms

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