Thats for the baby one. A set of winches for a 40 foot boat can easily set you back ?15k. And that?s before you feel a burning need for electric ones, which is comically more to buy and get installed, but good for pensioners with boat names like ?Sorry Kids?, I jest not.mikem said:Retail about ?500:
https://www.marinesuperstore.com/deck-hardware/winches/lewmar-self-tailing-ocean-winch
Fjell said:Thats for the baby one. A set of winches for a 40 foot boat can easily set you back ?15k. And that?s before you feel a burning need for electric ones, which is comically more to buy and get installed, but good for pensioners with boat names like ?Sorry Kids?, I jest not.
The thing about boats like that when you meet them out in the sticks is that the crew seem to be having a good time, but the owner is never there. Never seems like good value. I have cousins who skipper boats like that and I am told it is all true. They just move them around from place to place for a few days visit from the owner. Whatever. They seem to miss out on the one man maintenance schedule you get to enjoy with no shops to hand.Mark Wright said:Fjell said:Thats for the baby one. A set of winches for a 40 foot boat can easily set you back ?15k. And that?s before you feel a burning need for electric ones, which is comically more to buy and get installed, but good for pensioners with boat names like ?Sorry Kids?, I jest not.
One of my customers would have to add a couple of zeros if they needed to replace theirs.
Mark
Thanks.Fjell said:Chocolate fireguard said:Fjell said:This is the way I do it. This is just a simple z rig using two 90% Pulleys. I start from the haul being a force of 1 and work my way through. I am ignoring the angles. It def helps with more complex systems. If you use krabs at 50% instead you see how bad it gets. You get different answers in most rigs by swapping the krabs and pulleys about. It?s why using bearing pulleys like the microtraxion give such better results. In a z rig you go from 2.7 to 1.75 with krabs, something like that, if I haven?t cocked it up in my old age.
Yes that's a better way of doing things. It gives higher efficiencies than my method as it more accurately deals with what happens at the jammer.
You suggest that krabs give only 50%. Do you have anything on Stops, I'Ds etc?
Some here, you can work them out. There is a lot on the Petzl tech site on various things.
https://www.petzl.com/GB/en/Professional/Pulley-system-efficiency-tests-with-MAESTRO--I-D-S--PRO-TRAXION--ROLLCLIP---?ProductName=I-D-S
Unless you are just assisting someone, if you are alone you either have to go to 7:1 or counter balance. I would go for the latter and use your legs, way way faster. And use a decent pulley like a traxion, otherwise any loss in efficiency in the pulley you prob have to compensate by pulling up. A Stop or krab would be very hard going for any distance.mikem said:With I'D & one pulley (so standard Z rig) in perfect conditions, it'll be approx 2.2:1, so yes, can easily be below 2.
Does suggest the BCA recommendation to only use locking belay devices for rescues may be a bit simplistic, when it almost triples the effort required for hauling - fine for teams with plenty of manpower, but not great for one on one scenarios.
Fjell said:And use a decent pulley like a traxion, otherwise any loss in efficiency in the pulley you prob have to compensate by pulling up. A Stop or krab would be very hard going for any distance.
This is something that is taught and assessed in different configurations at both LCMLA L2 and CIC. It is perfectly feasible for an individual to do this hoist over short distances using a device like the Petzl RIG. The QMC recommend the use of an EN15151 device for belaying because that is the standard most applicable. The statement you refer to do is more to do with ensuring people are not belaying with Traxion or pulley-jammer style devices as standard practice. Using a Traxion is perfectly acceptable for assisting climbers and hauling, so lowering some down if they have issues using your RIG, and then re-rigging with a Traxion or pulley-jammer for a haul is common.mikem said:With I'D & one pulley (so standard Z rig) in perfect conditions, it'll be approx 2.2:1, so yes, can easily be below 2.
Does suggest the BCA recommendation to only use locking belay devices for rescues may be a bit simplistic, when it almost triples the drag on the haul - fine for teams with plenty of manpower, but not great for one on one scenarios.
...for belaying, not hauling. It must never be subjected to anything except a static load (i.e. no dynamic drops) or it may deform and fail in that specific configuration set out in the notice.mikem said:The advice said the pulley jammer "should no longer be used".
Mark Wright said:One of my customers would have to add a couple of zeros if they needed to replace theirs.
Mark
alastairgott said:That's a lovely bit of kit! you can rent it too, a mere snip at $0.5mill per week.
Although the report was about belaying, the recommendation wasn't specific about application & the previous discussion on here seemed to be discouraging any use...Pete K said:...for belaying, not hauling. It must never be subjected to anything except a static load (i.e. no dynamic drops) or it may deform and fail in that specific configuration set out in the notice.mikem said:The advice said the pulley jammer "should no longer be used".