Prevenors

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   We have just purchased a 2014 575 and seeking advice on rigging a boom preventor.  Wondering if anyone has a diagram or tips on securing the boom so we do not have to reinvent a system.  Thanks!

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sv_gargoyle Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 04 March 2025 Location: Canada Status: Offline Points: 8	Post Options Post Reply Quote sv_gargoyle Report Post Thanks(0) Quote Reply Topic: Prevenors Posted: 17 March 2025 at 20:12
	We have just purchased a 2014 575 and seeking advice on rigging a boom preventor. Wondering if anyone has a diagram or tips on securing the boom so we do not have to reinvent a system. Thanks!
	Gargoyle Crew

Wayne's World Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 18 July 2012 Location: Cruising Status: Offline Points: 1434	Post Options Post Reply Quote Wayne's World Report Post Thanks(1) Quote Reply Posted: 17 March 2025 at 23:43
	We fitted two lines (Port and Stbd) to one boom fitting in the mid boom position going through a low friction ring fitted to the port and stbd mid cleats and then back to a clutch mounted on the bulwark. From this the preventer can be led back to the aft winch via a turning block. We fitted a double clutch to the port side which was originally a single clutch for the headsail furler. We fit a single clutch on the stbd side bulwark in the same position which the stbd preventer goes to. Using the preventers run via the mid cleat they stop the boom moving whilst at anchor or in a marina etc. They can also be used to keep the boom positioned to one side or another when the sail is down. If you want to use a preventer to keep the boom to one side with the sail up we run the downwind preventer line further forward to a fixed padeye approx opposite the selftacking headsail track on the bulwark. We have a length of dyneema (approx 2 meters long) attached to the boom via a shackle and this attaches to the preventer using a dyneema soft shackle. Sounds complicated but not really. I will add another post with some images.
	Wayne W Cruising, currently in the Pacific until the end of 2026.

Gale Force Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 26 June 2018 Location: Sri Lanka Status: Offline Points: 398	Post Options Post Reply Quote Gale Force Report Post Thanks(0) Quote Reply Posted: 18 March 2025 at 04:15
	I use a Welder boom brake with great success.It allows the unwanted gybe but under total control. Duncan

Pzucchel Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 13 March 2020 Location: floating Status: Offline Points: 659	Post Options Post Reply Quote Pzucchel Report Post Thanks(0) Quote Reply Posted: 20 March 2025 at 08:36
	welder boom brake me too. I wouldn't go comfortably downwind without it...for the same reason, i also have two additional "preventer" sheet on the self-tacking jib: i damaged the rail between madeira and the canaries by having the jib "self-tacking" while going downwind...just for your thought. Edited by Pzucchel - 20 March 2025 at 08:38
	Hanse588#55

sv_gargoyle Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 04 March 2025 Location: Canada Status: Offline Points: 8	Post Options Post Reply Quote sv_gargoyle Report Post Thanks(0) Quote Reply Posted: 21 March 2025 at 13:58
	Thank you for the feedback. Will get it organized and try it on our first passage. Which hopefully will not be gale force and instead champagne sailing!??
	Gargoyle Crew

Black Diamond Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 24 October 2015 Location: Newport, RI, US Status: Offline Points: 1275	Post Options Post Reply Quote Black Diamond Report Post Thanks(0) Quote Reply Posted: 23 March 2025 at 21:06
	As an aside, if you need some 14mm line for your 575 for rigging work, I have half a spool of New England Ropes Endura Braid (red - see picture). I used it to replace the mainsheet. My friend (he has a Swan) split the cost of the spool but I did not need all of it. Probably 150' left. I'd let it go at low cost if you need some line.
	Rick S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI

Ratta&pippa Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 17 May 2024 Location: Med Status: Offline Points: 9	Post Options Post Reply Quote Ratta&pippa Report Post Thanks(0) Quote Reply Posted: 26 March 2025 at 13:43
	Hello on the SELDEN WEBSITE YOU FIND UNDER “HINTS AND ADVISE “HOW TO INSTALL A PREVENTER Dirk

Mainer Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Commander Joined: 05 January 2023 Location: Maine Status: Offline Points: 59	Post Options Post Reply Quote Mainer Report Post Thanks(0) Quote Reply Posted: 17 May 2025 at 15:28
	Hi Wayne W, Do you have any tips on how to install clutches on the bulwarks? In particular I’m wondering… - is there an easy way to access the underside of the bulwark? Inside the cabin under the bulwark I see a ~10-ft long narrow board on the ceiling. I’m wondering if it can be removed without having to cut out a hole in the middle to gain access. - did you install a backing plate to hold the clutches in place? —Mainer

Mainer Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Commander Joined: 05 January 2023 Location: Maine Status: Offline Points: 59	Post Options Post Reply Quote Mainer Report Post Thanks(0) Quote Reply Posted: 17 May 2025 at 15:36
	Hi Gale Force, Glad to hear the Walder brake is working for you. I bought a Walder ‘Hyper’ last year but am still trying to figure out how to rig it. The guys at Walder indicate it needs a 18 mm (3/4”) line running through it to be effective. I presuming I’ll fix one end of the line to the shroud plate but am at a bit of a loss as to how to secure the other (adjustable) end — none of the clutches on the boat (or, it seems, available to buy) can accommodate such a thick line. Can you provide the details of your rigging for the brake? —Mainer

Wayne's World Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 18 July 2012 Location: Cruising Status: Offline Points: 1434	Post Options Post Reply Quote Wayne's World Report Post Thanks(1) Quote Reply Posted: 17 May 2025 at 22:32
	Mainer, On the port side I removed the existing single clutch for the headsail furler and fitted a double by drilling new holes which still picked up on the aluminum plate in the layup so no need the fit a backing plate etc. I drilled the holes one size small and then ran a tap through of the correct size so both the fiberglass and aluminum were threaded. On the stbd side I fitted a single clutch in the same position as the port double clutch. I seem to remember there was an aluminum plate in the FG layup in this position as well. So again no need for a backing plate.
	Wayne W Cruising, currently in the Pacific until the end of 2026.



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