new mainsail rope

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I have modified Roy's solution with two 72mm double Harken blocks:

Edited by Fendant - 14 May 2016 at 09:46

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Fendant Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1671	Post Options Post Reply Quote Fendant Report Post Thanks(0) Quote Reply Posted: 09 May 2016 at 12:50
	I have modified Roy's solution with two 72mm double Harken blocks: Edited by Fendant - 14 May 2016 at 09:46
	Frank

igscymru Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 31 May 2016 Location: Milford Haven Status: Offline Points: 5	Post Options Post Reply Quote igscymru Report Post Thanks(0) Quote Reply Posted: 31 May 2016 at 10:10
	I have been looking into this modification for the mainsheet as the standard set up makes it difficult to get the boom near the centre line. I have tried it out and you need to get the blocks close together when the main sheeted in fully. It is definitely more effective and much easier to sheet in but I do have some concerns. Firstly as the mainsheet is halfway along the boom, there is a risk of bending it and thats why manufactures with the original system use two or three blocks spread along this area of the boom I would say the two block arrangement in an earlier post better than a single point on the boom for this reason. My other main concern is that with the original system the load is spread between the two deck fittings at all times where as with the fixed length strops as soon as the boom is move off the centre line nearly all the weight of the rig is on the one strop and only one deck fitting. This one deck fitting may be up to the job but I think the boat probably designed for the load to be shared between the two deck fittings either with the original (not very efficient) rig or with a traveller connected to both. I notice that the new jeaneau 389 has the strop fitting as standard now but not sure if they had the deck fittings strengthened. I would be interesting to know how every one is getting on with the fixed strops and their thoughts on the loads on the deck fittings.

Fendant Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1671	Post Options Post Reply Quote Fendant Report Post Thanks(0) Quote Reply Posted: 31 May 2016 at 15:32
	To be quite honest, I did not think about the two point connection to the boom at all. But imho you make a very valid point. thx. Concerning the load on the individal deck fittings I kept the same shackles with the same pin diameter. I will watch them this season and look if I get any distortion on the shackles at season end. If you are concerned you could go one shackle dia smaller, so that the shackle will go first before the deck Fittings.
	Frank

iemand Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 13 February 2004 Location: Germany Status: Offline Points: 1099	Post Options Post Reply Quote iemand Report Post Thanks(0) Quote Reply Posted: 31 May 2016 at 16:35
	The boom side is in my opinion a valid point. It is also the reason why the selden booms are very big. The deck sides are only relevant for a chinese gype. For nomal usage the sheet loads should be much less since the downhoul will take a lot of load and not the sheet any more
	Hanse 312 MJ 2004 - Hanse 370e MJ 2007

igscymru Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 31 May 2016 Location: Milford Haven Status: Offline Points: 5	Post Options Post Reply Quote igscymru Report Post Thanks(0) Quote Reply Posted: 31 May 2016 at 18:05
	It does feel physically that the sheet loads are a lot less, as before you had to crank in on the winch and having a sacrificial shackle a good idea. Worth keeping an eye on the deck fittings though as there could be up to about a tonne load there

Mark&Catherine Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 18 January 2013 Location: Greece Status: Offline Points: 1219	Post Options Post Reply Quote Mark&Catherine Report Post Thanks(0) Quote Reply Posted: 01 June 2016 at 06:11
	Here is my solution again, from 2.5 years ago, i have used the existing blocks and simply raised them on a pair of bridles. There is no damage to eyes or shackles, which are unmodified. Mark
	385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine

Mark&Catherine Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 18 January 2013 Location: Greece Status: Offline Points: 1219	Post Options Post Reply Quote Mark&Catherine Report Post Thanks(0) Quote Reply Posted: 01 June 2016 at 06:15
	As you might see, I only use the mainsheet on one side (port) as I have 2 spinnaker halliards.
	385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine

igscymru Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 31 May 2016 Location: Milford Haven Status: Offline Points: 5	Post Options Post Reply Quote igscymru Report Post Thanks(0) Quote Reply Posted: 01 June 2016 at 10:50
	Like the set up there Mark and easy to return to the original if any concerns. My only niggle is the weight on the deck as only one side taking the load. That said there seemed to be a lot more weight between the two deck fittings with the original system. Also interested on how your strops are constructed is there just a hard eye in the middle or do you use 4 separate strops. Ian

Mark&Catherine Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 18 January 2013 Location: Greece Status: Offline Points: 1219	Post Options Post Reply Quote Mark&Catherine Report Post Thanks(0) Quote Reply Posted: 02 June 2016 at 06:15
	They are one piece with an eye in the middle, the dyneema has been parted so that one 'leg' passes through the other, and then bound together with whipping. But next time I might go for 4 individual parts to avoid the constant movement of the eye against the line. So far we haven't seen any issue with the deck strength and close hauled both sides are under tension if you get the length right. Mark
	385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine

igscymru Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 31 May 2016 Location: Milford Haven Status: Offline Points: 5	Post Options Post Reply Quote igscymru Report Post Thanks(0) Quote Reply Posted: 02 June 2016 at 10:12
	Thanks Mark I jury rigged a similar set up to yours on my boat yesterday and found it an improvement over the standard set up and appeared to have less weight once I get the length of strops sorted will get some dyneema strops made. Ian



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