This can't be real??? Rope-eye stick on block

But won't it just rip the top layer off your deck?

Surely not?
I mean, yes the block has a SWL of 1000 kg, and the kine and plate, and I'm sure if you use good epoxy that will work. But won't it just rip the top layer off your deck? 

Anyone used this in real life? 

https://www.facebook.com/Harken/videos/10156367228821900/

Edited by mozzy - 26 Oct 18 at 2:49pm

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Guests Send Private Message Find Member's Posts Guest Group	Post Options Post Reply Quote Guests Quote Reply Topic: This can't be real??? Rope-eye stick on block Posted: 26 Oct 18 at 2:49pm
	Surely not? I mean, yes the block has a SWL of 1000 kg, and the kine and plate, and I'm sure if you use good epoxy that will work. But won't it just rip the top layer off your deck? Anyone used this in real life? https://www.facebook.com/Harken/videos/10156367228821900/ Edited by mozzy - 26 Oct 18 at 2:49pm

423zero Send Private Message Find Member's Posts Really should get out more Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420	Post Options Post Reply Quote 423zero Report Post Quote Reply Posted: 26 Oct 18 at 3:32pm
	Might just be me, but I prefer belt and braces for blocks etc, wouldn't fancy heading out to sea with my blocks glued on.

JimC Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662	Post Options Post Reply Quote JimC Report Post Quote Reply Posted: 26 Oct 18 at 4:35pm
	I've used surface glued on blocks in tension, but with a far bigger glue area than that, and not 150kg loads either. Thing is though, I didn't have the maths to calculate how big a glue area I really needed, whereas hopefully whoever is responsible for these does. I also wonder how long the strops last before chafe becomes an issue. Well, time will tell. Edited by JimC - 26 Oct 18 at 4:49pm

Neptune Send Private Message Find Member's Posts Really should get out more Joined: 08 Jun 09 Location: Berkshire United Kingdom Online Status: Offline Posts: 1314	Post Options Post Reply Quote Neptune Report Post Quote Reply Posted: 26 Oct 18 at 4:43pm
	SWL 150 kg, it’s a relatively modest amount, you’d not use it for a primary kicker take off, but lesser control points should be fine
	Musto Skiff and Solo sailor

PeterG Send Private Message Find Member's Posts Really should get out more Joined: 12 Jan 08 Location: United Kingdom Online Status: Offline Posts: 822	Post Options Post Reply Quote PeterG Report Post Quote Reply Posted: 26 Oct 18 at 5:12pm
	But won't it just rip the top layer off your deck? That would be the worry. I'm sure Harken can do their sums, and the ratings would work on a good substrate - but you are making assumptions about the quality of the lay of whatever you stick it to. Any fault in that could prove messy.
	Peter Ex Cont 707 Ex Laser 189635 DY 59

Guests Send Private Message Find Member's Posts Guest Group	Post Options Post Reply Quote Guests Quote Reply Posted: 26 Oct 18 at 5:26pm
	How do you ever replace the string or block?

Mike Holt Send Private Message Find Member's Posts Groupie Joined: 29 Nov 09 Location: United States Online Status: Offline Posts: 58	Post Options Post Reply Quote Mike Holt Report Post Quote Reply Posted: 26 Oct 18 at 5:31pm
	I have used a home made version for my toe-strap anchor points for the last 10 years. Not huge load, but I was nervous the first time I used them!

Oatsandbeans Send Private Message Find Member's Posts Far too distracted from work Joined: 19 Sep 05 Location: United Kingdom Online Status: Offline Posts: 382	Post Options Post Reply Quote Oatsandbeans Report Post Quote Reply Posted: 26 Oct 18 at 5:39pm
	I think its good, but then I like glue! If you think that an epoxy glue will give 15MPa+ ( 2000psi in old money) This should be good for the loads they say. Will it rip up laminates ? I doubt most lamnates will have + 30MPa shear strength so the laminate would have to be complete crap or gelcoat really badly stuck to cause damage. Go for it less problems with holes going through laminates which is good.

maxibuddah Send Private Message Find Member's Posts Really should get out more Joined: 06 Mar 09 Location: United Kingdom Online Status: Offline Posts: 1760	Post Options Post Reply Quote maxibuddah Report Post Quote Reply Posted: 26 Oct 18 at 6:47pm
	Biggest issue won't be the use of them, but rather how you replace them. Not sure I'd want to be using a grinder right next to the deck of my boat and hoping I don't slip
	Everything I say is my opinion, honest

Daniel Holman Send Private Message Find Member's Posts Really should get out more Joined: 17 Nov 08 Online Status: Offline Posts: 997	Post Options Post Reply Quote Daniel Holman Report Post Quote Reply Posted: 26 Oct 18 at 6:57pm
	Not watched the video, but glue is not great in tension, not sure of values but you also need to consider ripping thin laminates off cores in dinghy world as well. Adhesive joints always fail first in peel so you have to avoid that scenario. Like is said above, most epoxies can do 36N/mm2 in shear which even with a safety factor of 2, gives a tonne per square inch!! That’s a lot!! Most importantly tho this is predicated on clean well prepared surfaces ie all paint or gel rambled from both, 120g keying, chemically clean, immaculately mixed glue. Also, in shear you aren’t ripping thin laminates off cores. Although if I was going for as aggressively concentrated a load as a tonne per square inch even in shear I’d not want that on a dinghy ish single skin substrate of say 300gsm. I’d have a staggered local reinforcement to suit. Plenty of this sort of stuff on my boat. If it goes wrong, you can grind it off and install a new one. A good piece on diy. The variations are endless https://epoxyworks.com/index.php/make-your-own-soft-eye-pads/