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Adjustable raking systems
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iGRF View Drop Down
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    Posted: 17 Nov 20 at 9:56am
One for the technically minded this.

I'd like a single string raking system that adjusts the lowers simultaneously.

I'm sure I've seen it in Merlin World and wonder if anyone has some sketches as to how the pulleys line up.


My second question is, insteaad of raking the mast back top down has anyone ever come across anyone sliding the bottom of the mast back and forth windsrf longboard racing style, pivoting around the top spreader shrouds? (Obviously the lowers would have to adjust in concert also)

Edited by iGRF - 17 Nov 20 at 9:57am
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davidyacht View Drop Down
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Posts: 1345 		Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 20 at 10:50am
You probably should delve in the various Merlin Rocket forums, since I believe that there are two types of Merlin one string systems.  Look on the main website and also the Merlin Revival Facebook pages.

Unless you are a consummate boat bimbler you might look to get one of the Merlin gurus sort it for you.

Dick Batt had a ramp system for the mast foot, I think on Danger Bat.  This might be less complex.

I suspect that you could achieve 90% of this by having a decent forestay tensioning system and a decent and powerful shroud tensioning system, and ensuring that these are carefully calibrated.  In National 12s we simply dumped the shroud tension at the windward mark to allow the main to square off, and pulled it back on at the leeward mark.  We had three windward rake settings marked off on he control line ... light, medium and windy.
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Posts: 310 		Post Options Post Options   Quote Gordon 1430 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 20 at 10:53am
HI Grf
I had a 505 which had tracks on the shrouds so you could adjust them fore and aft in conjunction with raking the rig.
You have a short length of tack on each gunnel with a car on top which the shrouds attach to and the cars have a control line to pull forward or aft.  Mr Henshall might have some images of Grace which may have been one of the first with this system.
Good Luck
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Grace ... special boat
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 20 at 11:36am
A moving mast foot pivoting round the hounds will rake the mast but affect CofE rather differently. Good or bad I don't know.
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Posts: 750 		Post Options Post Options   Quote H2 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 20 at 11:51am
Originally posted by Gordon 1430

HI Grf
I had a 505 which had tracks on the shrouds so you could adjust them fore and aft in conjunction with raking the rig.
You have a short length of tack on each gunnel with a car on top which the shrouds attach to and the cars have a control line to pull forward or aft.  Mr Henshall might have some images of Grace which may have been one of the first with this system.
Good Luck
Gordon


I think Tasar use a track at the shrouds too?
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Posts: 356 		Post Options Post Options   Quote Dougaldog Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 20 at 12:05pm
Mr Henshall has indeed pictures of the tracks and of the hydraulic  shroud tensioners that were fitted at the time.  In the end, Chris Haworth did this best...Merlins and 5o5s! However, with the ready availability of modern, low friction/high load blocks, the complication that the system introduced could be best handled with a merlin style one string. What is really needed here is the Jon Turner 'big wheel of love' but my gut feel is that the cost of doing this will drive the man of Kent into another rage - even a fairly bog-standard one-string system on a Merlin can gobble up a cool £1000+ in hardware and cordage. Sadly, the OP won't accept that this has been done before, albeit somewhat differently - who can forget that Jon Turner (one of our great innovators of things that work) had a system on Dark Star that allowed the rig to be heavily canted to windward. 
The $64,000 question though.... all that knowledge and expertise in one boat (Turner and Richard Parslow) and a fully functional system - get they didn't proceed to develop it further - which must beg the question...why not!
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 20 at 12:21pm
Does your Fireblade need lowers, spreaders or even shrouds? Stick an OK or D Zero rig on it and have a sliding mast foot. Much easier, tidier and cheaper than a Merlin one string system. 
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Posts: 6499 		Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 20 at 12:47pm
Originally posted by Dougaldog

Mr Henshall has indeed pictures of the tracks and of the hydraulic  shroud tensioners that were fitted at the time.  In the end, Chris Haworth did this best...Merlins and 5o5s! However, with the ready availability of modern,


Well, let's see them then?

Why didn't they continue? Easy obvious answer to that.

I came across this Supernova, it was allegedly the 2014 Nationals winner on display at some show or other, but it had some sort of system, wish I'd paid more attention and taken more pics.

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iGRF View Drop Down
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Posts: 6499 		Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 20 at 12:49pm
Originally posted by A2Z

Does your Fireblade need lowers, spreaders or even shrouds? Stick an OK or D Zero rig on it and have a sliding mast foot. Much easier, tidier and cheaper than a Merlin one string system. 


Well I assumed because I want to trapeze from it, it would need additional support, has anyone ever trap'd off an unstayed rig? Is it do-able? I agree getting rid of all that dross would be great but....
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