[quote=randii]That was a lot of verbiage to get to my questions, but I hadn’t found it in one place.
Go all the way back to the stock 3:1 and the grommet is essentially used as a low-friction ring, added to the 2:1 cheek block, to get 3:1 net advantage. Granted, a block would be less friction still, but since this the highest-loaded portion of the system, below which all mechanical advantage is applied, almost any tension in the sail is going to prevent the line from sticking… at most, you’d have to give a little tug to break the static friction and get things moving and then dial in the desired downhaul. [B]So… why don’t folks use the grommet as the pivot for a basic 2:1 advantage in a top cascade?[/B] Seems like that’s be more function and fewer boat bucks spent.
I follow simple mechanical advantage – you’re moving twice as much line at half the effort. Configure 4 sheaves across 5 spans of line, and that’s a 5:1 system. I follow a basic cascade where you add a sheave riding between an anchor and a load, and you’ve halved that load, and that multiplies against whatever advantage you want to hang under the block that drives that sheave. [B]So how is it that the two 2:1 sitting side-by-side and cascading into the 4:1 system linked below don’t somehow add to each other before multiplying the 4:1 simple advantage to wind up as an 8:1 cascade?[/B]
(sidebar: I hate that Photobucket changed their policy and broke useful images across the ‘net!)
Google Image Search these words “downhaul estimated diamond wire tension help guidance” and the second image is an paint sketch.
You *may* be able to get there by clicking here: [URL]https://www.google.com/search?q=downhaul+estimated+diamond+wire+tension+help+guidance&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiPyoX-gYDWAhWJ8CYKHV6JCMEQ_AUICigB&biw=1536&bih=757[/URL]
This stuff is more fun to think about than work… and the Google image searches show some incredibly creative ways of multiplying and mounting these systems. The L-36 site has incredible diagrams! http://l-36.com/vang_systems.php
Randii<!-- editby --><em>Edited by randii on Aug 30, 2017 - 05:05 PM.</em><!-- end editby --> [/quote]
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