Stus-List Re: backstay tension?
On my 30-1, I use an old vang and a couple of old blocks – tie the blocks together with the sheaves on the split part of the wire (have to un-do the turnbuckles). Then hook the ‘vang’ to the joint between them and pull away! Goes from about 500# per leg to nearly 1000. On my boat all It does is firm up the forestay with my tree trunk mast. Gary From: dwight veinot via CnC-List Sent: Tuesday, April 20, 2021 2:53 PM To: Stus-List Cc: dwight veinot Subject: Stus-List Re: backstay tension? Backstay tension adjuster. If you are a cruiser!”set it and forget it”. If you are a handicap racer, “set it and forget it”. There are many more important things to pay attention to. Let that one be “you excuse to lose”. On Sun, Apr 18, 2021 at 9:20 PM Robert Abbott via CnC-List mailto:cnc-list@cnc-list.com> > wrote: Any advice/help appreciatedmy 32 has a split backstaySS rod down to the split where it is now wire coated to the turnbucklesno hydraulic gauge to measure pressureevery year when stepping the mast the backstay is attached and I tension the two turnbuckles before any after manual tension available...by looking at the mast, feeling the forestay, and the backstay,and I use my Loos RT 10 gaugeI know meant for the rod rig shrouds and not to measure tension on each side of the plastic coated wire split backstay. I estimate it to be 1,000 to 1,100 lbs. the way I am doing it but who knows. Is there a better way to determine what my at the slip backstay tension could be? Rob Abbott AZURA C 32 - #277 Halifax, N.S. Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu -- Sent from Gmail Mobile Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
Stus-List Re: backstay tension?
Backstay tension adjuster. If you are a cruiser!”set it and forget it”. If you are a handicap racer, “set it and forget it”. There are many more important things to pay attention to. Let that one be “you excuse to lose”. On Sun, Apr 18, 2021 at 9:20 PM Robert Abbott via CnC-List < cnc-list@cnc-list.com> wrote: > Any advice/help appreciatedmy 32 has a split backstaySS rod down > to the split where it is now wire coated to the turnbucklesno > hydraulic gauge to measure pressureevery year when stepping the mast > the backstay is attached and I tension the two turnbuckles before any > after manual tension available...by looking at the mast, feeling the > forestay, and the backstay,and I use my Loos RT 10 gaugeI know > meant for the rod rig shrouds and not to measure tension on each side > of the plastic coated wire split backstay. I estimate it to be 1,000 > to 1,100 lbs. the way I am doing it but who knows. > > Is there a better way to determine what my at the slip backstay tension > could be? > > Rob Abbott > AZURA > C 32 - #277 > Halifax, N.S. > > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu > -- Sent from Gmail Mobile Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
Stus-List Re: backstay tension?
Ok, I thought you meant the coated lifeline type. I've seen those plastic covers on a few boats, and they should be fine provided they are removed and the wire flushed every so often. Your idea of measuring the rod aloft is a good one, although the estimate you are using is probably close enough, provided you are not above 80% of the recommended maximum for the boat (or the wire). I'm not familiar with the mast on the 32, but if it's like most of the later models, it's probably more flexible than the mast on my 35mk2, which doesn't seem to bend much at all. I've helped step & unstep several masts at our club lately, and I noted that our mast showed by far the least amount of flex (and the most weight) of any of them - when hanging horizontally from the crane, with the strap just below the spreaders, with the spreaders pointing up/down, there was very little bend, and this is the weakest dimension. So I can imagine that my attempts to induce bend are mostly futile, and I am simply straightening the forestay(s) for going upwind. In my case, with a non-factory dual forestay setup, this is made more difficult. The inner forestay is attached at the upper shroud bracket, so only a few feet below the masthead. It's a Hyde Streamstay solid rod forestay, so probably doesn't stretch much. It will be interesting to see how it does once I get the mast back in, now that my hydraulics will hold pressure to >2500psi. I left it at 1500psi compressing a section of steel pipe for several days, and it didn't move, except for changes due to temperature (which were quite a lot!) I'm not sure there was actually anything wrong with my hydraulics (a shop replaced the small piston seal), since I have determined that it now reaches the limit of the stroke at around 800psi. I plan to either replace the backstay, or shorten the two SS bar extensions that are in place so that I can get to ~2000psi without running out of stroke. I suspect that 1" or so will be enough. My HydraTech adjuster only has about 3.5" of travel - probably not enough for a bendy mast, but presumably enough for mine. It also does not extend the piston easily - I understand some are spring loaded for release - so when testing on the bench, I need to apply a LOT of force to pull the piston back out - several hundred pounds at least. This could indicate a problem, so I may also be on the lookout for a suitable turnbuckle as a backup. I've had no luck finding any information on the HydraTech unit I have. -- Shawn Wright shawngwri...@gmail.com S/V Callisto, 1974 C 35 https://www.facebook.com/SVCallisto On Mon, Apr 19, 2021 at 6:38 AM Robert Abbott wrote: > The plastic over the wire is not a permanent/factory installationthe > boat's original owner must have decided to put them on for some > reasonmaybe to reduce chafing on the bimini...you can buy these > coverings by the foot at most yacht shops...you just pry them open to > fit on and off. He also put a piece on the babystay. > > The plastic coating(s) were removed few years back when I had a North > rigger inspect the standing rigging...no signs of corrosion anywhere on > the riggingthey can be removed and put on easily as they are split. > > The backstay is #8 Navtec rod but the split is too high above the > cockpit to measure with the Loos RT10 so I measure the two wire(s) > tensionI adjust the turnbuckles until the gauge reads approx. 500 > lbs. each and assume that means approx. 1000 lbs on the single rod. > > It probably doesn't work that way but that's the way I have been doing > it for 15 years and the rig hasn't come down yet. > > Maybe I should tension the rig and get hoisted to measure the SS rod > and when it is showing 1000 lbs without any added tension from the > adjuster, measure the two wires (without the plastic wrap). > > Advice? > > Rob Abbott > AZURA > C 32 - #277 > Halifax, N.S. > > On 2021-04-18 10:44 p.m., Shawn Wright via CnC-List wrote: > > Not sure about your question, but the plastic coated wire for a > > backstay would scare me... Be sure to check for corrosion. > > My 35mk2 manual states 2200psi i believe as the maximum pressure, and > > there is a chart which shows what tension this equates to. HydraTech > > tensioner, made in Vancouver. Mine is now holding pressure again, but > > I have no mast to attach it to at the moment... > > > > Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
Stus-List Re: backstay tension?
Rob, I don't want to be too technical, but with split backstay like yours, the tension on the rod is not exactly the sum of the tension of the two wires. It is less (sum x cos(angle)) because you pull at an angle. Since you mention that you cannot reach the rod, the angle is probably not that big, so you can expect better than 95% of that sum. Marek Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
Stus-List Re: backstay tension?
Not sure about your question, but the plastic coated wire for a backstay would scare me... Be sure to check for corrosion. My 35mk2 manual states 2200psi i believe as the maximum pressure, and there is a chart which shows what tension this equates to. HydraTech tensioner, made in Vancouver. Mine is now holding pressure again, but I have no mast to attach it to at the moment... On Sun, Apr 18, 2021, 17:21 Robert Abbott via CnC-List < cnc-list@cnc-list.com> wrote: > Any advice/help appreciatedmy 32 has a split backstaySS rod down > to the split where it is now wire coated to the turnbucklesno > hydraulic gauge to measure pressureevery year when stepping the mast > the backstay is attached and I tension the two turnbuckles before any > after manual tension available...by looking at the mast, feeling the > forestay, and the backstay,and I use my Loos RT 10 gaugeI know > meant for the rod rig shrouds and not to measure tension on each side > of the plastic coated wire split backstay. I estimate it to be 1,000 > to 1,100 lbs. the way I am doing it but who knows. > > Is there a better way to determine what my at the slip backstay tension > could be? > > Rob Abbott > AZURA > C 32 - #277 > Halifax, N.S. > > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu > Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
