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PostPosted: Wed Apr 23, 2014 10:59 am 
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At mid winters earlier this month I noticed that one of the guys from up North was using a very small upper main block. My new boat came with the 40mm upper block and this guy was running a 29mm block for the main. That's the same size as the downhaul block. Can the 29mm harken block stand up to the pressure of the main? or does this guy I saw carry more spare blocks than I think he does? The racing on Saturday and sunday was about 15mph winds and the only thing he broke was a main halyard and no blocks from what I saw.

Has anyone else seen this?


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PostPosted: Wed Apr 23, 2014 8:21 pm 
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Location: Detroit, MI
40 mm is the current stock mainsheet block. The 29 mm has a 990 lb working load. On a 6:1 mainsheet, that would mean you're hanging on to a 165 lb pull on the line. Probably not ever going to happen, even with dynamic loading.

29 mm is too big for the downhaul, even though Hobie sells the kit with them. I run Harken micro blocks.

I've never, ever seen a Harken block fail catastrophically. And I've been buying them for over 40 years.


Last edited by MBounds on Thu Apr 24, 2014 7:56 pm, edited 2 times in total.

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PostPosted: Thu Apr 24, 2014 1:25 am 
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MBounds i dont think the 29mm is stock. pretty sure the 40mm is stock. Per Matt Miller the stock main sheet is 9mm Liros. 29mm Harken block max line is 8mm.


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PostPosted: Thu Apr 24, 2014 6:59 am 
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Joined: Wed May 05, 2010 8:28 am
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Location: Clinton Lake, KS
Yeah. Stock should be 40mm. (i think) And I have broken a harken block, but I can break anything. :lol:

It was a carbo' air block that was on my 05 h16 Aussie system when I bought the boat

Sent from my stone tablet


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PostPosted: Thu Apr 24, 2014 11:09 am 
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ronholm wrote:
Yeah. Stock should be 40mm. (i think) And I have broken a harken block, but I can break anything. :lol:

It was a carbo' air block that was on my 05 h16 Aussie system when I bought the boat

Sent from my stone tablet


The Carbo blocks are not really strong enough for the jib halyard (Aussie style). I used Harken wire bullet blocks for that application (roller bearings, not ball) and I had one eventually fail (but not catastrophically). I just use what comes on the boat now.


Last edited by MBounds on Thu Apr 24, 2014 2:29 pm, edited 1 time in total.

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PostPosted: Thu Apr 24, 2014 12:10 pm 
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Location: Clinton Lake, KS
Humm... I guess I will have to take a quick measurement.. I didn't think the upper block was that small.

I replaced the blocks on the old boat with the harken ones you suggest for the Aussie halyard, and looks like the new boat came with the same..(came from Sohn) Harken warrantied the Carbo blocks no problem.. But they remain in the toolbox.


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PostPosted: Thu Apr 24, 2014 12:26 pm 
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MBounds wrote:
All the boats at the Worlds were rigged with 29 mm upper mainsheet blocks.
I've been using 29 mm upper mainsheet blocks for I don't know how long - at least 10 years. I forget what came on my 2007, but every newer boat I've seen at a regatta since has 29 mm blocks.
.



Harken H2640 ??????


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PostPosted: Thu Apr 24, 2014 2:33 pm 
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OK, so I got out my ruler, and my eyes are definitely calibrated to English measurements.

The upper blocks on my 14 and 16 mainsheet systems are 40 mm. :oops:

I've corrected my posts where I could. A 29 mm would work, but it's really small.


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PostPosted: Thu Apr 24, 2014 3:09 pm 
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Location: Clinton Lake, KS
MBounds wrote:
OK, so I got out my ruler, and my eyes are definitely calibrated to English measurements.

The upper blocks on my 14 and 16 mainsheet systems are 40 mm. :oops:

I've corrected my posts where I could. A 29 mm would work, but it's really small.



thats what she said :lol:

I have the same issues. :D


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