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Check out this block by Ronstan

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Bille
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Check out this block by Ronstan

Postby Bille » Thu Aug 08, 2013 5:30 am

Check out this block by Ronstan ; looks like something we
could use on a kite. Handel's Line capacity to 1.4-5.0 mm (1/16"-3/16")

http://www.murrays.com/mm5/merchant.mvc ... gory_Code=

Bille
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cleepa
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Re: Check out this block by Ronstan

Postby cleepa » Thu Aug 08, 2013 6:28 am

The BRM Clouds use something very similar to this instead of pulleys on the bridles. Works great.

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Re: Check out this block by Ronstan

Postby Toby » Thu Aug 08, 2013 7:12 am

I wonder how much wear this has on lines?

But looks a lot better than a pulley!

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Re: Check out this block by Ronstan

Postby ronnie » Thu Aug 08, 2013 9:09 am

Details of how the friction compares of the Shock Block to some Ronstan pulleys.

http://www.ronstan.com.au/marine5/shock_or_block.asp

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joe_mgh
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Re: Check out this block by Ronstan

Postby joe_mgh » Thu Aug 08, 2013 9:21 am

That friction comparison doesn't include an RF13101 that's full of sand and salt and won't turn...

My sneaky inside sources tell me that these 8080s are already being installed on some 2014 kites.

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Re: Check out this block by Ronstan

Postby Toby » Thu Aug 08, 2013 9:21 am

well, at 45° 20% more and 180° 50% more...
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joe_mgh
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Re: Check out this block by Ronstan

Postby joe_mgh » Thu Aug 08, 2013 9:25 am

If you scroll right to the bottom chart, they actually rate it's coolness!

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Re: Check out this block by Ronstan

Postby longwhitecloud » Thu Aug 08, 2013 9:44 am

wonder if they are ptfe coated or something

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Re: Check out this block by Ronstan

Postby ronnie » Thu Aug 08, 2013 10:19 am

Its basically saying that if you are lifting a 90kg load, you pull with

95kg using a free-running pulley and 3mm line or 5mm line

105kg using this block and 3mm line

107kg using this block and 5mm line

My Opinion - If the pulley was stuck, pull required would probably be about the same as the block but the pulley would wear more and isn't as strong in the first place.

They also claim in Note 4 that it has 33% less friction than a stainless steel or alloy thimble (slider).

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Re: Check out this block by Ronstan

Postby uncle sammy » Thu Aug 08, 2013 10:40 am

Fone use to have Ronstan pulleys and They were crap.
Now they make there own type and they rock.
Blade used a similar device like this instead of pulleys, though don't know if they do anymore.


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