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Davits
Jul 11, 2006 13:24:17 GMT
Post by hsilverman on Jul 11, 2006 13:24:17 GMT
Interested in knowing about anyone's experience with transom mounted davits. I am considering installing Kato Marine Voyager davits to lift an AB 11 DLX (about 550 pounds with engine) tender. Davits rated to 420 pounds each arm so I am not worried about the davits. It's the transom I am worried about. Boat is a 54DS.
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Davits
Jul 12, 2006 9:33:08 GMT
Post by nce on Jul 12, 2006 9:33:08 GMT
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Davits
Jul 21, 2006 15:44:59 GMT
Post by zzmeyer on Jul 21, 2006 15:44:59 GMT
From a Beneteau 50 owner - do not rely on stern pullpit for any support of the davits. Make sure large backing plates to spread the load. Make sure the dingy is high enough never to be swamped while underway. Make sure dingy is firmly held when in the up position. Shock loads can be extreme with a loose dingy.
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pappy
New Member
Posts: 1
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Davits
Aug 28, 2010 19:27:57 GMT
Post by pappy on Aug 28, 2010 19:27:57 GMT
Totally agree with zzmeyer on installation. Stern does not have the strength(too thin) to hold davits w/o mantioned backing plates AND additional supports to spread the load(s). Used a St.Croix and the height is very good for offshore. On my 45'DS, I have elec. winches and use the STB side to raise and lower engine. Due to loads, any offshore trips the engine should be placed on a pad on the stern to reduce stress on the system.
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Davits
Aug 28, 2010 20:07:46 GMT
Post by dublin on Aug 28, 2010 20:07:46 GMT
I agree the hull does not have the strength. You will have to tie them back to strong points within the structure.
I saw a much better arrangement recently. Stainless steel brackets were mounted to the foredeck shaped to match the hull shape of the dingy and the dingy was strapped to them. You have plenty of deck space in front of the mast.
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Davits
Sept 15, 2010 12:25:11 GMT
Post by jpagan on Sept 15, 2010 12:25:11 GMT
With respect to Davits, I have a similar boat, 49DS. I installed Simpson davits made by Cooney Marine in the UK. They in fact advertise the davits using a 54. The stern is amply strong, but I still used a 3/4 inch thick treated wood backing plate. I have sailed extensively with a dingy on the stern, but do not recommend leaving the engine on the dingy as this increases the dynamic loads perhaps beyond the capabilities of the davits.
Cheers,
jp
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Davits
Sept 21, 2010 3:44:03 GMT
Post by pj on Sept 21, 2010 3:44:03 GMT
Have a look at the attached pics. The davits carry a 3.2 m (10.5 feet) with a 15hp attached. I'm guessing around 120 kg ( say 300 pounds) -note the pics only show a 2.7 m tender. The davits carry 2x 120 watt solar panels (which generate around 10 amps) as well as the GPS and Iridium antennae. We used 2in stainless and the design brief was to retain the original stanchion angles. Strength was not a problem with the davit/stancions being bolted through interior plates and the load spread as evenly as possible. You will note the "grab handles" on each side of the transom gate --these were an earlier mod which substantially reduced the flex. Lifting and lowering is a breeze with the lines leading to the eelctric primaries. Lastly -not a cheap exercise especially as I had the welds ground and polished! Happy to answer queries or send more pics. Regards PJ ( Mooloolaba, Australia) I'm not sure if all the pics have been attached as they are removed for the preview. If they are note there bear with me and I'll try again
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Davits
Sept 21, 2010 3:58:03 GMT
Post by pj on Sept 21, 2010 3:58:03 GMT
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Davits
Sept 21, 2010 10:30:40 GMT
Post by sailbleu on Sept 21, 2010 10:30:40 GMT
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Davits
Sept 22, 2010 5:23:06 GMT
Post by electricmonk on Sept 22, 2010 5:23:06 GMT
With respect to Davits, I have a similar boat, 49DS. I installed Simpson davits made by Cooney Marine in the UK. They in fact advertise the davits using a 54. The stern is amply strong, but I still used a 3/4 inch thick treated wood backing plate. I have sailed extensively with a dingy on the stern, but do not recommend leaving the engine on the dingy as this increases the dynamic loads perhaps beyond the capabilities of the davits. Cheers, jp Be careful, the stern without lots of extra reinforcement is not strong enough, many owners start with a piece of wood and end up with a 10mm stainless plate and several layers of mat and resin. A dinghy full of water is heavier than a dinghy with an outboard, and you have no control of how much water will get into the dinghy or when! Its not the davits you need to worry about, its the stern moulding, next time your out in a seaway look at the the flexing of your transom.
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