Paddy1000111

It hasn't been fiddled with before has it? If they left the cylinder seal off the bottom then it could pump up the compression by a tonne? Could even be touching the head?

Well the winch on the GRCS is a regular boat harken 2-speed self-tailing rope winch which are around £700 depending on the model and what you want out of it. The steel which I will probably use some S275 structural will come to around £60 for some 1/2" plate, some tubing for the hinges and some angles for the brackets. The 5 tonne ratchet strap which can be surface mounted is £15. Powdercoat is £30 ish and then it's just the welding but I have a friend who will do that for a good price. The whole thing would probably set me back £800 to £900 plus testing. When I get round to doing it I'll do a guide and post up how I get on!

Well, I can build the unit and get it powedercoated for sub £1000 including the harken winch. The GRCS system is around £2800 with the VAT so unless single testing costs £1800 then I'm quids in!

I guess my next question is having single units approved. I've done work for aircraft/marine companies and councils etc as an engineer. There's all sorts of specialist lifting equipment and tooling that's all made in house. I wonder how they get that approved?

Anyway, back on topic. I didn't mean this to be a "mines better than yours" "I'm better than you" thing... Just explaining how I SRT when I'm unsure of anchor and how I feel it's safer than DDRT as we were discussing the dangers of srt. At least this seems like a clean cut case of climber error...

Well I was trying to work out if the GRCS is rated or the winch? The only thing to go wrong is the welding which would be certified or the strap/ratchet which would be pre-made? All of the components would theoretically be rated?

Sorry, bad explanation on my behalf. I usually tie an alpine butterfly and stick a carabiner through it and pull that up onto the the small ring side of the cambium saver. The knot side which is now unloaded goes over other branches and gets basal tied, if my cambium saver branch snaps then the loading changes to the basal anchor and hopefully the branches below. Worst case scenario the top snapping branches on the way down would hopefully slow my decent a little ?

It's basically because if you use a cambium saver you tie into the cambium saver and you hang off a branch so it is only your weight on the branch i.e a top anchor. In this format you're climbing with the same forces as a DDRT system, all of your weight only on the branch. If you base anchor then it's like having a pulley on the branch. Your weight of say 80kg is on one end of the line then the other end has to balance your weight so the anchor is basically weighing or pulling 80kg too. In total you have now loaded the branch with 160kg (your weight on one side of the line and the anchor pulling your weight again on the other acting as a 2:1 pulley system. Now, let's say you climb above your anchor point without using redirects. The "safety factor" when doing rigging if my mind is remembering correctly is 11x. You slip and fall 2/3 meters. Your shock loading (especially as you are using a static line) can be up to 880kg. Now, because of the basal anchor and the 2:1 system you have created your loading on the limb is now 1760kg of force in the worst case scenario.

Hi everyone, I'm curious as to if anyone has made their own GRCS system? I have been looking at the GRCS system and it is, for me anyway, restrictive on a cost front and apart from the steel and the cost of the winch from a sailing supplier (all of which you could get for under £1000) there's nothing "special" in a sense. If it was welded by a trained and certified welder and made from the correct steel there's no reason I can't design my own is there?

It's around 5ft from the tree. There's a steep drop off the back (right side) that's the natural "lay of the land" there was a steep drop off from the back of the lake but it got levelled out and a load of trees (oak, maple, beech) planted on the new hill, all of those are growing well. I can't say 100% where the soil went, I wasn't there at the time!

Wow, like others have said that's an ambitious anchor. I usually use a cambium saver for srt (with an alpine butterfly and carabiner stopper) and I would be reluctant to tie to anything smaller than my fore-arm and I'm only 76kg. Personally, If I'm not sure 100% of my anchor (dying tree or questionable condition etc) I install the cambium saver so I'm not double loading the branch and then run the unloaded tail end of the rope down over other limbs and tie off as a basal anchor. It may be a bit anal and probably too belt and braces but I would rather spend 2-3 minutes firing my unloaded rope tail over some branches and tying off at base than spending hours/days in hospital and possibly a lifetime in a wheelchair. Plus climbing a tree is easier when my arse isn't going 5p, 50p the entire ascent. I also think that sometimes people forget that when using a basal anchor for srt and no cambium saver/top tie anchor, the limb loading is double your weight and needs to be quite beefy if you fell. Looking at that branch something went wrong in the human factor sense. Either neglect (not paying attention to his anchor), laziness (there wasn't a bigger limb that high and took the short cut instead of using re-directs) or something else. No-one in their right mind would climb on that SRT or DDRT. Personally I wouldn't even use that as a re-direct. I guess climbing SRT got him the 8m though with lack of friction and smoother ascent (dependant on technique). I think SRT is safer mind. Less friction and rope wear, smoother ascent (dependant on technique) and more ability to add redundancy i.e throwing the unloaded end of a top anchor system over some branches and base tying. The only downside to SRT is you are climbing on the single rope rating not double that but with most ropes being rated to <2000kg with an impact force of something crazy like 5200kg I'm not that concerned. In reply to Devon TWiG, I don't think it adds justification for two anchor points. If the rope snapped or the climbers system failed due to a manufacturing fault etc then I would say yes. Although if your climbing system failed or the rope snapped in DDRT then you would be no better off. This is just a case of operator error. It's this sort of stuff that causes people to be sucked into shredders, car accidents etc.... I don't mean this aimed at the climber in this post but the old saying "you can't fix stupid" comes to mind. If there's people involved there will always be a human factor. He could have had 2 anchors but then you could say cars need two drivers, guns need two triggers, countries need two governments (the last one might not be a bad idea...). accidents happen, it's life.

Ahh, now you're on to something. The area of bare dirt is the sheep however where the new oak trees are on the right in the 3rd image is where a couple hundred tonnes of mud was shifted from another part of the property a couple of years back. There's also a lake on the left of the tree, can that cause root rot of some sort?

It depends on your agreement with him. As a subcontractor he is liable for damage caused by his work practices and will have insurance in place to cover damages during his work. That's just a fact of subcontracting and in reality, one of the reasons companies use subbies a lot. As far as I am aware there's no such thing as employers/company insurance that covers subcontractors of yours apart from covering from liability for example if they injure themselves on your equipment (which as a subcontractor they shouldn't be using anyway) and try to sue you. If he IS under your insurance, using your equipment and his damage is your problem then he is an employee of yours, you should be paying him on PAYE and he will be under IR35.

Hi Everyone, So I have an Ash tree that is looking like a bit of a sick puppy and I wanted a little bit of input from guys who have experience with Chalara. The tree itself is in West Dorset and there doesn't appear to be any cases registered anywhere close. The property has a good 2 figure sum of ash trees on it and this seems to be the only one suffering in any way. The tree overall looks poor, it's not thriving at all with a lot of dead/dying limbs. There is new growth from lower sections of the main trunk and the only growth that is green is from new/fresh branches, there are cankers and most of the growth seems to be dying. I can't see any symptoms of die back, no black splotches on leaves, no lens shaped lesions etc. The leaf litter is pretty normal, no black twigs etc. The rest of the Ash trees on the property are thriving, full crowns, no dead limbs (the next large ash tree being around 20m from this one. What do people make of it? I'm at a bit of a loss of what to do with it seeing as the chances of it having ash die back are very small. It sure isn't healthy though.

As others have said it's impossible to say without saying where you are. Check for any rights of way on your deeds etc and follow the guidance that openspaceman gave you. Apart from that there is no "right to roam" private land is private land. I advocate the use of signs and fences. People are a pain and land boundaries seem to drift if you dont rule with an iron fist