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Run inside, slather 4200 around the thru hull on the inside, start the nut on the thru hull and snug it up by hand. All rights reserved. All images and diagrams in this article courtesy of Airmar Technologies, the leading manufacturer of recreational fishfinder transducers. As a general rule, you should fair a through hull over the area of a circle whose radius is equal to about 4 for every 1/8 the fitting protrudes above the surface of the hull. The transducer beam must be unobstructed by the keel or propeller shaft(s). Because polyester resin will kick off quickly in the thick mixture youre going to make, do a dry run before committing yourself to the job. Recheck steps 1 through 4. You should operate the valve by turning it on and off to make sure that when an attached hose fails you can stop the water flow. Moeller Moeller Marine Flanging Tools Starting at $42.52 Groco Groco Stainless Steel Thru-Hull Fittings Starting at $29.99 Moeller Moeller Turn Tite Bailer Plugs Starting at $6.53 Perko Perko Hose Barb Thru Hull Fittings Starting at $40.38 TH Marine TH Marine Straight Thru-Hull Fitting Starting at $11.20 Perko Perko Garboard Drain Plugs Island Packet even used solid fiberglass backing blocks as opposed to plywood.. Builders like this should be, Copyright 1994 - 2023 Compass Marine Inc. | All Rights Reserved, A seacock shall be securely mounted so that the assembly will withstand a 500 pound (227 Kg) static force applied for 30 seconds to the. Take each appropriate size to the through-hull it fits, drill a hole in the larger end and thread a string or monofilament line through and tie it to the through-hull fitting. The thru-hull failed at 404 pounds while trying to get to the 500 pounds and let it hold for 30 seconds. - Drill square to the hull's deadrise angle, not vertically. While some builders are off pinching pennies other builders actual do care about below waterline integrity. Clean the mounting holes of debris,add sealant to the holes and threads of the mounting screws,then install. As a last resort on a through hull that isn't recessed flush, you can sometimes grab the flange with a pipe wrench laid flat on the surface of the hull. This SS175 is a stainless steel semi-flush mushroom thru-hull. The cabinet that the bilge pump hose runs through is also where the electrical fuse panel and switches are, so I'd really like to get this fixed to avoid creating extra opportunity for . After cutting the hole for the seacock, you will need to seal the now-exposed core material between the hulls inner and outer skins. Mounting your transducer in an incorrect location can cause a problem due to turbulence, air bubbles and obstructions such as the boat's keel. If you combine reducing through hull drag with other bottom improvements, such as careful attention to the application of bottom paint, you will be well on the way to measurable improvements in performance, without spending much money. Reducing the drag of through hull fittings is only the first step in creating a low resistance bottom. Best Way to Cap Off a Thru-Hull - Cruisers & Sailing Forums STEP-1: Cut a hole through the hulland backing block slightly larger thanthe thru-hull fitting OD, and measurethe thickness of the hull and backingblock together (Dimension-A). Remove the through hull and the seacock. Very slight error in concentricity can be eliminated by slight grinding of the edges of the through hull or the edges of the mortise, although the best course is to be very careful in locating the center before doing any cutting. Measure the deadrise angle of the hull at the selected location (see diagram at right). I would suggest refusing to take delivery until proper flanged bronze or Marelon OEM / 93 Series seacocks have been installed. Get your new flush-type through hull, and get a hole saw the diameter of the flange of the through hull fitting. Don't be shy, put a good amount around the thread and tighten up your seacock to the desired position and leave to dry. The arrow/pointed end of the fairing points forward toward the bow. Claude L.-Auger . Backing blocks should be roughly a minimum of 1.5 times the diameter of the seacock's flange. Two methods are acceptable. This means that cutting a mortise is a simple one-step operation, involving only a large spade bit or a hole saw and chisel to cut and finish the recess. To mimic what a boat owner, or boat yard may install, the components were a mix of what was on hand at the chandlery. The hull will be locally reinforced, and there will be no possibility of water penetrating the core. A hole saw arbor costs about $8, the hole saws about $8 to $12 each. Less care is required with a wood or fiberglass hull. Plastic transducers are recommended for fiberglass or metal hulls. It has a tilted element, so it is compatible with hull deadrises from 8 to 15. thru hulls and other fittings are measured according to "nominal pipe size". When the boat is placed in the water, immediately check around the transducer for leaks. Thru Hull Size? | Sailboat Owners Forums For inboards, mount it well ahead of the propeller(s) and shaft(s). (You can get them at most Marine Supply stores.) VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Safety and reliability depend upon the right gear. This ensures theres no weakness where youve breached the core and also ensures water doesnt enter the core material. Then fill the void with thickened Backing plates should be two to three inches larger indiameter than the thru-hull nut or seacock flange. The long side must be parallel to the centerline of the boat. Ready to put the boat back in but there is a foot of ice on the creek and 2 more storms are forecast for . If you want better construction techniques keeping your family afloat, it needs to start with us, the consumer. do-it-yourself: installing a thru-hull transducer, Do Not Sell Or Share My Personal Information. Same info as you received previously. Cutting them shorter would reduce the lever-arm but negate any thread match if a combination threaded thru-hull was used. Once the putty has set up, fair it in to the surrounding hull, making the transition as smooth as possible. Seacocks are required to shut off the flow of seawater supplied via a through-hull fitting to onboard equipment, including engines, gensets, livewells, air-conditioners and the head. Screw the hull nut in place and tighten it with slip-joint pliers (see Figure 3). Otherwise, order will be ready the following business day. With your multimeter, measure the amperage that passes between the bonding-system wire and the through-hull. How about this builder.. As conducted the testing, to ABYC standards, it became apparent that a 3/4 Marine UL bronze valve threaded to a 3/4 Marine UL rated thru-hull fitting, does not meet ABYC H-27 Standards. To start with, in-line valves useNPT (National Pipe Taper) threads, which are not compatible with the NPS (National PipeStraight) used in most thru-hull fittings (unless the thru-hull fitting is machined withcombination thread). Cut acircular backing plate from -inch marine plywood, then drill It may also be necessary to cut the stem shorter to allow it to screw far enough into the seacock to be flush with the surface of the hull. Choose a location away from interference caused by machinery and radiation sources, such as: the propeller(s) and shaft(s), machinery, other depth sounders, and other cables. To apply the load gradually and steadily I used an old Lewmar self tailing winch attached to the end of the work bench. The smoothness begins to be compromised almost immediately, however, as through hull fittings, transducers, and bottom paint are added. This image shows a close up of the failure. I just did not have a good way to apply the load to the actualinboard end of the assembly of this particular 90 degree hose adapter. Microspheres are slightly less dense, and their white color gives you a fairing putty that more or less matches the white bottom gelcoat of most boats. For boats capable of speeds above 25 knots, review transducer location and operating results of similar boats before proceeding. In-line ball valves have NPT (National Pipe Taper) threads. As a general rule, you should fair a through hull over the area of a circle whose radius is equal to about 4" for every 1/8" the fitting protrudes above the surface of the hull. a hole in the center with the hole saw used to drill the thru-hullhole in the hull. The sealant must extend 1/4" higher than the combined thickness of the hull, fairing and backing block (if used), and the hull nut. Option #3 Remove the crakced fittings . Support the length of wood on both sides of the fitting with a couple of wooden blocks. The materials for this test were all off the shelf UL Mairne products. Plug unused through-hull? - iboats Boating Forums You can choose from straight and elbow . Seacocks may be made of bronze or Marelon. Removing the waterproof connector or cutting the cable, except when using a watertight junction box, will void the sensors warranty. Installation inside a cored hull requires removal of the core. Wet sand perfectly smooth before applying bottom paint. If you want flush fittings on a thin solid hull, it will be necessary to lay up fiberglass on the inside of the hull, in effect building a glass backing block under the seacock at least as thick as the hull skin, preferably thicker. A backing plate provides additional support to the hull and aflat mounting surface for the thru-hull nut or seacock flangeshould there be any hull curvature. A real Catch 22 for a builder who likes to pinch pennies. I'm shopping for a replacement thru-hull and seacock, but I'm confused about how they are labeled. Are the stern thru hulls 1" or 1 1/8. For a better experience, please enable JavaScript in your browser before proceeding. If you have made a wrench for the thru hull you can go on and tighten it up until it is good and tight with the pipe wrench on the nut and the internal wrench going down the inside. Option #1 Remove the cracked fittings and replace them with thru hull transom sleeves (they make them in plastic) and then plug them. Oddly enough, the ones weve seen are really a poor design for the job, because theyre fairly difficult to install, and have a flange that is too thick to use in the typical fiberglass production boat without reinforcement of the inside of the hull. If you want to recess a through hull on a cored boat, take a deep breath and steel your nerves: heres how to do it. Sizes are usually available in 1/16 increments. Nave Rara Beneteau Oceanis 43 Reply Save Like What is the correct way to measure for thru hull diameters? Install Your Backing Block Install your backing block following the instructions in my other articles on seacocks. B260 bronze thru-hull with standard fairing block. Dont cut through the inner skin! When buying a boat with this type of installation please be aware of and know that it is, and can be, a potential week point that may not meet the minimum ABYC safety standards for seacocks and thru-hull fittings, at least in the 3/4 size range. Hull 1-1/2". The helper will be most useful on the inside of the boat, installing the retaining nut and holding the through hull in position. How to fit and service through-hull fittings - boats.com The thru-hull was fitted to my bench and tightened down well using a spud wrench. 27.6.1.3 Threads used in seacock installations shall be compatible (eg. Do not leave the boat in the water for more than three hours before checking it again. You can use a router, or a specialty tool like a Dremel or Fein MultiMaster (themultimastersystem.com/index.jsp), to ream out the core material and create an epoxy compression ring. With a pencil, draw a circle on the hull around the fitting, the circle defining the area to be faired in. You probably have a 1/2 inch one, but best way is to measure it. As I mentioned builders rarely, if ever, cut the thru-hulls shorter for better strength characteristics. not into the hull (use a drill stop or piece of tape attached tothe bit to prevent this). Glue your backing block down with epoxy resin. Clean the remains of the core material thoroughly from the inner surfaces of both fiberglass skins. Even if I managed to get the valve within 1/8 of the thru-hull nut, and then moved the load to the proper positioning for ABYC H-27, the thru-hull would have still failed at well below the standard of 500 pounds at the inboard end of the assembly for 30 seconds. Use grommets to prevent chafing and support the cable properly with cable clamps or wire ties, per ABYC specs for marine wiring. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. EDIT: I later tested a 1 thru-hull & ball valve combo and had it fail at below 500 pounds as well. There is some risk of distoring the hull locally from the heat of laying up this fairly large patch, so it is best done a few layers at a time. Then you will buy a new, like-sized fitting. Thread the transducer cable through the fairing (if used). Fairing in a fitting is pretty much the same, whatever the hull material. The discharge thru-hull for our example will be bronze. Get community news, buying bargains, and how-to guides at your fingertips. Using a hole saw and chisel, cut a circular mortise in the planking the depth of the through hull flange and the diameter of the inside surface of the through hull flange. Cutting the mortise for a recessed through hull is the hardest job, because the mortise must be flat on the bottom, beveled on the edges. This will help avoid chipping the gelcoat. Apply a 1/16" thick layer of marine sealant (3M 4200 or Sikaflex 291 are popular choices) to the surface of the transducer that will contact the hull/fairing and up the stem. Why handicap a cruising boat, which is probably already underpowered in light air, by having a bottom which almost guarantees reduced performance in the lightest conditions? It is 1 1/2. Put another way, given two boats identical in every way, including sail area, the boat with the smoother bottom will be slightly faster than a boat with a rough bottom in light air. Rather, they must be faired in externally. She had been fitted with bronze flanged seacocks, utilized solid fiberglass backing plates and the flanges were through bolted to the solid fiberglass hull. Enjoy banner ad-free browsing with SailNet Community Plus. To insure a perfectly flush fitting in the final installation, the through hull should actually be pulled slightly below the outer surface of the skin during the molding process. Get community news, buying bargains, and how-to guides at your fingertips. Cut a hole through the outer skin of the boat, concentric with the existing hole for the through hull, that is the size of the flange of the new flush through hull fitting. 4. We replaced every Thru Hull and Seacock on Sunday with TruDesign. A mixture the consistency of cake frosting is just about right. Here the backing block, and Groco flanged adapter are shown epoxied, bolted & sealed into the hull with Sikaflex 291 and ready for the bronze thru-hull to be threaded into it from outside. PDF GROCO Valves and Thru-Hull Fittings Installation !---- TRU DESIGN -----https://www.trudesign.nz. This is a simple step by step guide on how we did it.--- Before you start ---Your existing . ----- PATREON -----https://www.patreon.com/sailingsundayCome join the crew on PATREON! -clean up resin overflow on the outside of the hull with acetone before the resin kicks off. You will need to build a jig out of plywood to safely hold the transducer at the precisely correct angle as you push it past the blade of your bandsaw or table saw. Smooth any rough edges of the hole withsandpaper. The actual fairing process is straightforward. For practical purposes, the bottom of a displacement-type sailboat can be considered smooth if the surface varies no more than 2 mils .002! stupid thru-hull measurement question | SailNet Community The valve was then threaded onto it and the elbow threaded into the valve. To fill the cavity youve created by removing core material, youll need loose fiberglass fibers, or chopped strand mat, which easily pulls apart. Before the scheduled haulout, make sure you have the correct transducer. The transducer you select must be compatible with your fishfinder and include the specific capabilities you desire. Youll need a partner to help. I want to replace the thru hull under the galley sink. Recessing the through hull flush with the skin of the boat is more effective in creating a low drag surface. Start the drill in the reverse direction to score the surface. Mask off the areas of the outside of the hull adjacent to your work area, using polyethylene. Wax-free laminating resin must be used, or the interlaminar bond will be poor. A much more easily installed flush fitting is made in Europe, but does not appear to be available in this country. Repeat the process when screwing on all your fittings, and use 2 new hose clamps on all hose connections. UL-1121 "The components of a through-hull fitting or sea valve shall be formed of galvanically compatible materials having the strength and resistance to corrosion necessary to withstand intended and abnormal use to which they are likely to be subjected." Smooth the mixture on the hull, tapering the thickness from the edge of the through hull out to the circle youve drawn on the hull. Probably not but there is a higher probability than a seacock assembly that actually meets the ABYC standard. Stray Current Test - Power & Motoryacht Thread the appropriate hose fitting for the equipment being served onto the top of the seacock. flange, then insert it into the hull. 2. Rather than trying to describe the failure with photos I made a video, that is unedited, to show the testing and failure point. -Backing blocks are essential on the inside of the hull to help distribute load. It may, however, be necessary to physically hold things in place on the inside of the boat. Contact us: info@southernboating.com. In each case, your fittings should be of high quality and have an appropriate design and diameter. Many products featured on this site were editorially chosen. Someone paid over $200k for this boat! Either stainless steel or bronze is acceptable whenmounting nylon seacocks. If installing in a cored fiberglass hull, do not over-tighten, crushing the core. For a cored hull, excavate the coring around the hole toa depth that encompasses an area at least as large as thethru-hull or seacock flange.

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