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Old 12-04-2018, 06:36 AM   #21
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"Any science to back that up?"

Hull speed for double enders , even if very light, can be found in most any boat design book.

Try Skeens elements.

During WW1 with massive power the Euros were able to get high (sort of ) speeds from long thin patrol boats , using 3 or 4 engines.

Marco Polo a Herrishoff design simply used length and a big engine to attempt a 10K cruising speed.
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Old 12-04-2018, 10:36 AM   #22
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Any science to back that up?
If you are referring to the ss United States lifeboats, please see article below :

apart from that, the upper superstructure of the ss United States was made of aluminum too. Same goes for the lifeboats of the ss Rotterdam of 1959, aluminum was the preferred material for lifeboats before GRP and after wood.....ss Rotterdam's boats were made bij Verhoef in Aalsmeer in Holland. By the way - the ss Rotterdam is still looking for 4 original lifeboats (9.50 meters o.a) to fill the last 4 empty davit pairs...........

Source for ss United States :
https://maritimematters.com/2013/02/...ght-have-been/

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Old 12-04-2018, 11:50 AM   #23
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The brochure for my Vashon states that the hull is "an adaption of a motor rescue boat designed to meet NOAA and ABS specifications." I've had folks ask me if my boat was a customized life boat.
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Old 12-04-2018, 02:18 PM   #24
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Any science to back that up?
One dosn’t need much science to answer that question.

Water tends to follow a curved surface. Water has considerable weight. When the water running under the boat reaches the stern of a FD hull it is sucked up by the tendency of water to follow a curved surface. The waters mass (weight) is turned upwards. “For every action there is an equal and opposite reaction” You pull the water up and you pull the stern down. The boat then is at an attitude (very bow high) that will allow no further increase in speed. Even with significant increases in power. Eventially the boat looses directional stability to the extent that it goes out of control.
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Old 12-04-2018, 03:43 PM   #25
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Did the warranty go south?
I was tempted to buy several in years past.

What warranty? Lifeboats were sold from ship scrappers as is. Troopships that were mothballed after WWII were scrapped starting in the late 1960s. The ships at that time were a ball of rust, completely uncared for since their crews left. They were not preserved to the degree of warships and that was not enough. Many were scrapped at the mouth of Hylebos Waterway in Tacoma at the site of the WWII shipyard. There were dozens of lifeboats sitting around uncovered waiting for buyers. I think they went for a few hundred. The lifeboats were only built for one short trip, to get away from a sinking ship and float for a few days. Some had oars and a few had a prop powered by the survivors working a handle at each seat. The seats were mostly rotted wood at that time.
Picture is land between Hylebos (top) and Blair waterways. The USN owned the land until about 1990. After WWII there were about 20 escort carriers stored there.
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Old 12-06-2018, 09:25 AM   #26
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There are quite a few 25-35ft open fiberglass lifeboats turned into cabin cruisers and liveaboards around the internets. I've wanted to find one of those large enclosed lifeboats to turn into a liveaboard.


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Old 12-06-2018, 05:17 PM   #27
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Just went by a pile of old lifeboats in Houma LA.

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Old 12-06-2018, 07:30 PM   #28
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Australia buys new f/g ones, much like those on cruise ships used as tenders. Border Force/Navy give them to potential irregular entrants onboard people smuggler boats, with with a compass course and just enough fuel to land in Indonesia, that`s after they "deal with" the smugglers boat.
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Old 12-06-2018, 07:45 PM   #29
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Lepke wrote;
Originally Posted by Nomad Willy View Post
“Did the warranty go south?
I was tempted to buy several in years past.”

Just a joke Lepke .. sorry
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Old 12-06-2018, 07:49 PM   #30
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There is a French guy who bought a "peniche" long time ago and cruised to India with it (who knew that these kind of boat intended for river transportation would be able to withstand such sea!) and created floating hospital with it. When his project was done, as a man of action he searched for another one. He started to buy old lifeboat to build "school bus boat" to bring children from their remote location to the school where before they needed many hours by walk.
Looms like these lifeboat are the "jack of all boats"!

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Old 12-07-2018, 02:10 PM   #31
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Just went by a pile of old lifeboats in Houma LA.

Attachment 83289



Any info on those? I wonder if they were stripped of their running gear for other boats? I've ran into that while looking for one to buy.
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Old 12-07-2018, 03:56 PM   #32
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Any info on those? I wonder if they were stripped of their running gear for other boats? I've ran into that while looking for one to buy.
Here's where I saw them

https://goo.gl/maps/3SWAH68gRdN2

No further information, sorry. There are countless operations around this area that cater(ed) to the offshore oil and gas industry. I just thought of this thread as I was cruising by yesterday.
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Old 12-07-2018, 11:53 PM   #33
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Here's where I saw them

https://goo.gl/maps/3SWAH68gRdN2

No further information, sorry. There are countless operations around this area that cater(ed) to the offshore oil and gas industry. I just thought of this thread as I was cruising by yesterday.
Thanks. I'll send them and email and see what happens.
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Old 01-01-2019, 10:26 AM   #34
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I'm late to this thread but I wanted to throw mine in there. This is a picture of what it used to look like but I've repowered it and am building a different cabin now.Click image for larger version

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Old 01-01-2019, 10:57 AM   #35
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I'm late to this thread but I wanted to throw mine in there. This is a picture of what it used to look like but I've repowered it and am building a different cabin now.Attachment 83795
Very cool! Need more pics.
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Old 01-01-2019, 11:22 AM   #36
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Very cool! Need more pics.
I believe that's the only old picture I have of it and unfortunately it's currently under a cover and isn't complete yet. I have the engine installed, the new deck and wash rails on but haven't started the shelter yet, it' going to have a lot more deck space as I'm going to use it for fishing. I do have one picture of the mess last summer.[ATTACH]83796[/AT


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Old 01-01-2019, 12:55 PM   #37
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I'm late to this thread but I wanted to throw mine in there. This is a picture of what it used to look like but I've repowered it and am building a different cabin now.Attachment 83795
I really like that. What company made the hull and what model, if you don't mind sharing.
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Old 01-01-2019, 01:46 PM   #38
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I really like that. What company made the hull and what model, if you don't mind sharing.
It was built at the Webbers Cove boatyard here in Maine as a USCG motor whaleboat. She's a bit unique as military whaleboats go as she had a Perkins 4-108 with a Borg Warner 72c transmission and a skeg. Most Navy whaleboats have a Paragon gear that's unique to those boats and no skeg. Also she has more sheer with a higher bow and less rise in the stern than Navy boats.
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Old 01-01-2019, 02:11 PM   #39
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It was built at the Webbers Cove boatyard here in Maine as a USCG motor whaleboat. She's a bit unique as military whaleboats go as she had a Perkins 4-108 with a Borg Warner 72c transmission and a skeg. Most Navy whaleboats have a Paragon gear that's unique to those boats and no skeg. Also she has more sheer with a higher bow and less rise in the stern than Navy boats.
Thanks. You're right, I would have never guessed her to be a Navy boat. I was thinking she was a custom build. Good specs for a nice cruiser or fishing boat.
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Old 01-01-2019, 02:28 PM   #40
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Thanks. You're right, I would have never guessed her to be a Navy boat. I was thinking she was a custom build. Good specs for a nice cruiser or fishing boat.
You have a good eye. The point of my project is to have a boat that'll cruise at between 5 and 6kts. while using less than a half gallon of fuel per hour. According to Boatdiesel's calculator at 5kts. it should use .3 gallons per hour.
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