Forum: General Discussion
01-24-2024, 01:11 PM
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Replies: 14
Views: 5,607
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Forum: General Discussion
01-24-2024, 11:43 AM
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Replies: 14
Views: 5,607
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Forum: General Discussion
01-15-2024, 01:16 PM
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Replies: 37
Views: 3,289
In retrospect this was insane.....luckily the...
In retrospect this was insane.....luckily the boat was very lightly loaded. Ferries have been lost (Estonia ('94) and Herald Of Free Enterprise ('87)) with 100's of folks drowned due to water on...
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Forum: Boating Safety and Concerns
12-16-2023, 10:52 AM
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Replies: 150
Views: 10,002
I guess everyone has a different idea of what...
I guess everyone has a different idea of what "expensive" might be, I don't think of it as cheap, but also it's not wildly expensive. If the owner provides an accurate hull lines drawing, inclining...
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Forum: Boating Safety and Concerns
12-15-2023, 03:26 PM
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Replies: 150
Views: 10,002
This is a question of degree. If you are adding...
This is a question of degree. If you are adding 1000 lbs up high on a 15,000 lb boat, that's a big deal.....On the other hand if you're adding 1000 lbs up high on a 65,000 lb boat, it will raise the...
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Forum: Boating Safety and Concerns
12-15-2023, 03:16 PM
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Replies: 150
Views: 10,002
Obviously it will make a big difference if...
Obviously it will make a big difference if there's significant flair, with most boats it's not really a huge factor so max beam can be used. Again, the roll-timing is a crude approximation, but will...
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Forum: Boating Safety and Concerns
12-15-2023, 02:19 PM
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Replies: 150
Views: 10,002
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Forum: General Discussion
05-01-2023, 01:00 PM
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Replies: 12
Views: 1,668
The photos are just another clue showing the...
The photos are just another clue showing the folly of trying to say anything definitive about stability from a visual assessment.....it doesn't work. You must go through the calculations and you...
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Forum: Other Trawler Systems
01-22-2023, 11:52 AM
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Replies: 105
Views: 7,868
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Forum: Other Trawler Systems
01-21-2023, 02:12 PM
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Replies: 105
Views: 7,868
Compressive strength perpendicular to grain for...
Compressive strength perpendicular to grain for Douglas Fir is 870 psi, strength in tension is about half this and strength in sheer and bending is quite a bit higher than this.....so the 10 psi load...
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Forum: Other Trawler Systems
01-20-2023, 06:06 PM
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Replies: 105
Views: 7,868
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Forum: Other Trawler Systems
01-20-2023, 03:44 PM
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Replies: 8
Views: 734
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Forum: General Discussion
05-24-2019, 01:30 PM
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Replies: 6
Views: 910
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Forum: General Discussion
01-04-2019, 03:47 PM
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Replies: 75
Views: 18,289
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Forum: General Discussion
01-04-2019, 03:39 PM
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Replies: 75
Views: 18,289
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Forum: General Discussion
07-03-2018, 04:59 PM
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Replies: 36
Views: 7,371
The boat is hard-chined with a fairly flat...
The boat is hard-chined with a fairly flat bottom, it really wants to follow the face of the wave (snap-roll) . It sounds like the boat has excellent low angle stability, so it will take...
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Forum: General Discussion
05-25-2018, 03:29 PM
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Replies: 13,835
Views: 2,154,164
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Forum: Other Trawler Systems
05-04-2018, 02:24 PM
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Replies: 82
Views: 26,164
That "local firm" has installed 270 sets of...
That "local firm" has installed 270 sets of rolling chocks but any data is anecdotal at best. There is a paper out of New England from 20 years ago comparing the performance of rolling chocks with...
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Forum: Other Trawler Systems
05-03-2018, 03:41 PM
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Replies: 82
Views: 26,164
Hi Murray,
Scaling up to real life from...
Hi Murray,
Scaling up to real life from those model tests, for a 45' boat the keels would be 3", 6", and 11" wide, no word on length. Without reading the paper I can tell which was most...
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Forum: Other Trawler Systems
11-28-2017, 02:28 PM
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Replies: 106
Views: 29,330
Even very experienced people have a hard time...
Even very experienced people have a hard time separating stability and motion. One keeps you safe, the other keeps you comfortable.
Nordhavn is advocating reducing stability by raising the center...
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Forum: General Discussion
09-17-2017, 04:51 PM
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Replies: 13,835
Views: 2,154,164
Right, not a Feadship. Probably a De Vries...
Right, not a Feadship. Probably a De Vries Lentsch design, built in Holland or Italy. Alternately it might be a Benetti designed and built in Italy, but I lean toward the De Vries.
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Forum: Helmsman/Camano
03-19-2017, 04:17 PM
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Replies: 152
Views: 29,577
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Forum: General Discussion
02-19-2017, 02:24 PM
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Replies: 22
Views: 2,907
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Forum: General Discussion
02-13-2017, 02:05 PM
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Replies: 19
Views: 3,976
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Forum: Welcome Mat
01-29-2017, 10:55 AM
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Replies: 13
Views: 3,053
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