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Post by saltymetals on Apr 14, 2021 9:51:49 GMT
There is nothing in the 43ds specs to say the location of the centre of gravity. Why am i asking? It is essential data in order to measure the limit of stability once we have added all sorts of kit like Radar, in-mast furling, transom arch, bimini, life-raft on deck, , spray-hood, none of which would have been included in the factory spec. Does anyone know where we can get the COG data? It seems i have someone in Practical Sailor (a US sailing magasine) who can sort out the maths once we know what the factory data is on the COG.
Andrew
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Post by andreshs1 on Apr 14, 2021 12:30:52 GMT
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Post by rxc on May 1, 2021 16:47:48 GMT
I can give you a data point. I have a shoal draft 43DS with a genset (aft) an arch with windmill and 2 solar panels, in-mast furling, liferaft in port cockpit locker, heavy RIB dinghy that is carried on the foredeck when offshore, 8HP honda outboard hanging on the aft rail, full cockpit enclosure, including bimini, dodger, transition piece and full vinyl side curtains, and Radar on the mast.
In 2008, about 60 miles S of Bermuda, in Force 6 conditions with seas of about 12-14 ft, our steering quadrant failed, and the boat fell over on its side. All the way - maybe even a bit over 90 degrees. My face was plastered to the vinyl, and there was solid blue water on the other side.
The boat came right back up and we steered into Bermuda with the emergency hand steering device. About 10 hours.
The fuel tank was probably about 1/2 full, the water tanks were full, and the boat was still pretty well stuffed with consumables, spare parts and tools, food, and four people. The 10 jerry jugs of diesel on the rails were probably mostly empty.
So, with all that stuff installed, the boat fell over and righted itself. The cockpit enclosure is what saved us, by keeping the water outside the cockpit and out of the boat.
There were no cats on board.
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Post by alenka on May 4, 2021 7:35:02 GMT
Hi Andrew,
Sorry I cannot help you on this but in the last 8 years we have only suffered one partial knockdown in our 43ds. We have in-mast, solar panel arch, tender on foredeck and outboard on rail.
We were traveling between islands in maybe less than 4kt of wind (full sail) but could see an acceleration zone developing about 1nm away. We got hit by a wind bomb that came off a pretty big hill/mountain behind us. My son, who does not sail, was on the helm and didn't know what to do. I guess we went over by about 65deg before he turned into wind and we popped straight back up.
I have no idea what the wind speed was but as we have sailed full sail in up to 26kts of apparent without problem I am guessing it was over 40kts.
The wind disappeared as quickly as it hit but I am always mindful now that if I spot an acceleration zone developing in one area it can quickly suck air in from just about anywhere.
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