Block sizes

[Jools_of_Top_Cat]

When referring to blocks some chandlers like to say 8 to 10mm rope etc. others will say size 2, 3 or 4 for example.

Would someone please be kind enough to tell me the conversion from size to rope diametre.

Thank you in advance......

<hr width=100% size=1>Julian

<A target="_blank" HREF=http://www.topcatsail.co.uk>Top Cat Homepage</A>

 

[ccscott49]

size 1 little rope, size 4 big rope!
Dragonfly wooden blocks, size 3, max 12mm, size 2 max 10mm size 1 max 8mm there are other sizes, but thats all the ones I use.

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[Jools_of_Top_Cat]

Thank you for that, it is easy when in a shop but buying on line makes it more scientific so to speak.

<hr width=100% size=1>Julian

<A target="_blank" HREF=http://www.topcatsail.co.uk>Top Cat Homepage</A>

 

[bob26]

http://www.bartonmarine.com/index2.htm

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[bob26]

http://www.bartonmarine.com/index2.htm

and click on "Products" - I should have added


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[sailorman]

spinlock & lewmar both have comprehensive sites

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[poter]

Julian,

what blocks are you looking at?

Just that the difference in standard blocks from Barton & ball bearing blocks is small enough to go for the ball bearing blocks all the time.

I even use the ball bearing blocks as guides.

barton do a good catalogue which is all blocks travellers track, etc. etc. not quite as technical as the Lewmar catalogue but comprehensive.

The Barton block sizes are:

Standard blocks
block 1 30mm sheave 8mm line
block 2 35mm sheave 10mm line
block 3 45mm sheave 10mm line
block 4 58mm sheave 12mm line

Cruiser blocks
block 5 54mm sheave 12mm line
block 6 63mm sheave 12mm line
block 7 70mm sheave 14mm line

They then go onto high load blocks up to 18mm rope.
I have got quite a lot of barton gear from various chandlers to refit Shady & have been impressed with their kit. The boomstrut is a great bit of engineering easy to fit & works.

The web site is:
www.bartonmarine.com
If you go there you also get block loads etc. also a tech help email.

have fun.

poter.

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[Jools_of_Top_Cat]

All I am after are a couple of 8mm or size 1 cheek blocks to build a lazy jack system while my mast is down next weekend.

I don't think I need a ball bearing raced block as 90% of the time it will be sat static.

I appreciate your help though

<hr width=100% size=1>Julian

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