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Author: Mark Storey Subject: Lifting strap/braces Info: (15494 views) Posted: Tuesday 6-1-10 11:00:53 PM |
Thanks Tom and everyone! :: Mark-
:: As info Witchy Woman had some deck damage at the through :: deck port for the main lifting strap. I also was not :: happy with the deflection in the strap as it went :: through the deck. I used a larger 6" port and moved the :: hole forward so there would be less deflection in the :: strap. Basically, when I cut the new hole I kept the aft :: position of the hole and enlarged the cut forward for :: the new port. I too use 1/4" spectra to large 2000# load :: rated carabeaners to the aft corners of the deck where I :: have two Winchard eye bolts (where I attach the spin :: blocks). The new set up works perfectly, with the whole :: forward, and instead of 6" of deflection there is maybe :: a 1" of deflection in the main strap. I don't screw :: around with with extra eye points on the top of the :: sling where the crane attaches, I just use one 14000# :: load rated tow strap webbing that attaches to the keel :: eye (bolts) with a large galvanized shackle and the aft :: steadying lines (legs) attach to the tow strap right :: below where the crane attaches. I would not use the :: winches to lift the boat ever, nor anything near the :: cabin top to help lift the boat, as the shock loading :: can be fairly high. Also, try to keep the bow down, to :: keep the mast clear of the crane....Hope this helps.
:: Tom Jenkins :: :: :: :: Sure, I'll chime in. Whatever triangular strap you have :: :: bolted to the keel bears the weightof he boat. This must :: :: be absolutly bombproof. The various arrangments of :: :: straps/lines to whinches or side rails keep the boat :: :: flat, or slightly bow down, when hoisting. These must be :: :: strong, too. Adjust the weight of the sails and things :: :: in the boat so the boat wants to hang flat and slightly :: :: bow down. You want it bow down so the mast doesn't hit :: :: the hoist crane. Put maybe the beer cooler or 20 pounds :: :: on the bow when hoisting. And always keep carefull watch :: :: that the spreaders do not get hung up on the hoist :: :: crane. SDK :: :: :: :: :: Hi Maryann . . . I'm not sure about using the winches to :: :: :: attach the braces . . . without a backing plate down :: :: :: below (not necessarily fender washers) . . . someone :: :: :: else who does might want to chime in on their time :: :: :: tested experience attaching directly to winches. :: :: :: :: :: :: I also do not cross sheet winches . . . because their :: :: :: not angled to pull in toward the center of the boat . . :: :: :: . and you can see this action tweek the deck in toward :: :: :: center at winches . . . although for hositing the boat, :: :: :: likely a situation with less weight. :: :: :: :: :: :: mb :: :: :: :: :: :: :: I have the triangular lifting arrangement but have been :: :: :: :: attaching to the winches (several wraps w/ half :: :: :: :: hitches), since I removed the toerail. Is there any :: :: :: :: reason why I shouldn't be doing this? :: :: :: :: :: :: :: :: Also, it seems to be difficult to keep the main strap :: :: :: :: centered in the port throughout the lifting process. :: :: :: :: Does anyone have any suggestions? :: :: :: :: :: :: :: :: :: :: :: :: :: Hi, Yes, the sling lifting trianglur strap in the bildge :: :: :: :: :: is NOT a single point lifting point . . . requiring two :: :: :: :: :: braces from top of sling to rail (each side) back by the :: :: :: :: :: primaries or farther aft for maximum bracing leverage. :: :: :: :: :: :: :: :: :: :: I would not cut up the boat; personally. :: :: :: :: :: :: :: :: :: :: My sling is 4 of 5 Star tensil chain with large :: :: :: :: :: stainless shakles on each end. :: :: :: :: :: :: :: :: :: :: The Up end has one piece of high strength lined attached :: :: :: :: :: to the top shackly (mid length) using a cow hitch . . . :: :: :: :: :: and carbiner hooks on each tail. . . one on each for :: :: :: :: :: attachement to perforated toe rail. Always hook :: :: :: :: :: Carbiners gate up to take the max load. :: :: :: :: :: :: :: :: :: :: Same arranegemebnt is used for boats with T track rails :: :: :: :: :: & cars for attachement . . . or U bolts thru deck at :: :: :: :: :: brace attach points; port & starboard. :: :: :: :: :: :: :: :: :: :: mb :: :: :: :: :: :: I presume the boat was set up for a three point bridal :: :: :: :: :: :: so it would be stable while suspended. :: :: :: :: :: :: :: :: :: :: :: :: We had a nylon lift strap made with a shackle for the :: :: :: :: :: :: strap on the keel bolts, up through the port to a point :: :: :: :: :: :: about 1-1/2 feet above the deck. There's a heavy steel :: :: :: :: :: :: ring on the top end of the main strap. Two smaller nylon :: :: :: :: :: :: straps come off that same ring and are sized to center :: :: :: :: :: :: the main strap in the port with the boat level. They :: :: :: :: :: :: have carabiners at the deck end and these clip to the :: :: :: :: :: :: toe rail outboard of the winches. :: :: :: :: :: :: :: :: :: :: :: :: I cant see why a 6 inch port wouldn't work. Just :: :: :: :: :: :: remember there needs to be a clearance cutout on the :: :: :: :: :: :: front edge of the hatch for the port. :: :: :: :: :: :: :: :: :: :: :: :: Bob Harvey :: :: :: :: :: :: :: :: :: :: :: :: :: We just recently purchased an E27. Could anyone tell me :: :: :: :: :: :: :: why the port for the hoisting strap doesn't align with :: :: :: :: :: :: :: the strap. There must be some reason for this. I read an :: :: :: :: :: :: :: earlier post discussing how two extra lines secured to :: :: :: :: :: :: :: the toe line near the winches are required to center the :: :: :: :: :: :: :: strap through the hole. :: :: :: :: :: :: :: :: :: :: :: :: :: The former owner of this boat obviously did not realize :: :: :: :: :: :: :: this as there is damage to the deck at the port. :: :: :: :: :: :: :: :: :: :: :: :: :: :: I am planning on cutting out the damage and putting a :: :: :: :: :: :: :: 6" port instead. Is there any reason I could not do :: :: :: :: :: :: :: this? :: :: :: :: :: :: :: :: :: :: :: :: :: :: Mark
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