Bromleyxphil Posted November 20, 2019 Report Posted November 20, 2019 Hi guys, spoken to tuckeys about boat transport. They told me to get a local crane company in to do a site survey as I want to build my boat here at home. How much does a 57x10 weigh in empty and then fully fitted. Ball park figures. My guess is 15 then 20 ton? phil
MtB Posted November 20, 2019 Report Posted November 20, 2019 3 minutes ago, Bromleyxphil said: Hi guys, spoken to tuckeys about boat transport. They told me to get a local crane company in to do a site survey as I want to build my boat here at home. How much does a 57x10 weigh in empty and then fully fitted. Ball park figures. My guess is 15 then 20 ton? phil ISTR Blackrose mentioning his finished boat weighs 33 tonnes, but its wider than yours at 12 ft. When you buy your steel, it will be priced in tonnes and you'll order in tonnes AIUI, so you'll know roughly what the bare shell will weigh. 1
stegra Posted November 20, 2019 Report Posted November 20, 2019 It depends on the ballast. If you mean empty as in without ballast, then 15 tonnes is probably about right. Ballast alone could be over six tonnes so finished weight will likely be over 25 tonnes. 1
notts_alan Posted November 20, 2019 Report Posted November 20, 2019 About same size as me , around 30 tonne fitted out . 1
Guest Posted November 20, 2019 Report Posted November 20, 2019 My 57 x 12 is 33 ton including wheelhouse
Peter X Posted November 20, 2019 Report Posted November 20, 2019 Those replies all sound about right to me. Looking at the physics of it, your boat will be about 18x3 metres, so if it would sit half a metre (about 1'8") into the water, it would displace 27 cubic metres of water i.e. 27 tonnes. So my guess would be maybe in the range 20-25 tonnes when empty, and 25-30 tonnes when fitted out depending on the boat's design and what you put in it. I suggest you make a list of the weight of the steel and everything else, maybe in a spreadsheet, and add it up. 1
Bromleyxphil Posted November 20, 2019 Author Report Posted November 20, 2019 Thanks guys I think I am now prepared for the conversations to come. cheers phil
The Dreamer Posted November 20, 2019 Report Posted November 20, 2019 13 minutes ago, Peter X said: Those replies all sound about right to me. Looking at the physics of it, your boat will be about 18x3 metres, so if it would sit half a metre (about 1'8") into the water, it would displace 27 cubic metres of water i.e. 27 tonnes. So my guess would be maybe in the range 20-25 tonnes when empty, and 25-30 tonnes when fitted out depending on the boat's design and what you put in it. I suggest you make a list of the weight of the steel and everything else, maybe in a spreadsheet, and add it up. I like this answer, and consider it my lesson for the day. I always thought, and I am not sure why, other than someone must have told me, that the weight of a boat was different to it’s displacement. Having now read further I have learned that I was wrong! 1
Bee Posted November 20, 2019 Report Posted November 20, 2019 If a few tons makes a big difference you could leave the ballast out until it goes in the water then lift the floorboards to put the ballast in later. That means that you will make the floor in removable sections which is a Good Thing. Good luck, its a big job.
MtB Posted November 20, 2019 Report Posted November 20, 2019 3 hours ago, The Dreamer said: I like this answer, and consider it my lesson for the day. I always thought, and I am not sure why, other than someone must have told me, that the weight of a boat was different to it’s displacement. Having now read further I have learned that I was wrong! No, displacement IS the posh word for it's weight!!
TheBiscuits Posted November 20, 2019 Report Posted November 20, 2019 4 hours ago, The Dreamer said: I always thought, and I am not sure why, other than someone must have told me, that the weight of a boat was different to it’s displacement. It depends which planet you're on!
MtB Posted November 20, 2019 Report Posted November 20, 2019 9 minutes ago, TheBiscuits said: It depends which planet you're on! Do you hold that a boat of say, 20 tonnes displacement on Mars would weigh other than 20 tonnes on Mars then?
TheBiscuits Posted November 20, 2019 Report Posted November 20, 2019 8 minutes ago, Mike the Boilerman said: Do you hold that a boat of say, 20 tonnes displacement on Mars would weigh other than 20 tonnes on Mars then? Yep. The mass would be the same, but the weight would be different ... In fact, 20 tonnes on Earth is about 7.5 tonnes on Mars. 1
MtB Posted November 21, 2019 Report Posted November 21, 2019 47 minutes ago, TheBiscuits said: Yep. The mass would be the same, but the weight would be different ... In fact, 20 tonnes on Earth is about 7.5 tonnes on Mars. Whoever mentioned mass? Displacement and weight are the same thing innit, duh....
David Mack Posted November 21, 2019 Report Posted November 21, 2019 1 hour ago, Mike the Boilerman said: Do you hold that a boat of say, 20 tonnes displacement on Mars would weigh other than 20 tonnes on Mars then? I don't think the Martian 'canals' actually have water in them, so a boat on Mars wouldn't displace anything.
MtB Posted November 21, 2019 Report Posted November 21, 2019 18 minutes ago, David Mack said: I don't think the Martian 'canals' actually have water in them, so a boat on Mars wouldn't displace anything. Don't be silly. Of COURSE they do. What else would be in the canals?
matty40s Posted November 21, 2019 Report Posted November 21, 2019 5 hours ago, Mike the Boilerman said: Don't be silly. Of COURSE they do. What else would be in the canals? Martian newts
David Mack Posted November 21, 2019 Report Posted November 21, 2019 7 hours ago, Mike the Boilerman said: Don't be silly. Of COURSE they do. What else would be in the canals? Shopping trolleys.
Guest Posted November 21, 2019 Report Posted November 21, 2019 7 hours ago, Mike the Boilerman said: Don't be silly. Of COURSE they do. What else would be in the canals? Martian goo.
ditchcrawler Posted November 21, 2019 Report Posted November 21, 2019 But is it floating in freshwater or salt if on the BCN it could be diesel and oil
Murflynn Posted November 21, 2019 Report Posted November 21, 2019 16 hours ago, The Dreamer said: I like this answer, and consider it my lesson for the day. I always thought, and I am not sure why, other than someone must have told me, that the weight of a boat was different to it’s displacement. Having now read further I have learned that I was wrong! has that 'someone' never heard of Archimedes? - think Eureka!! ........................ and I am not referring to the EU.
Alan de Enfield Posted November 21, 2019 Report Posted November 21, 2019 8 minutes ago, Murflynn said: has that 'someone' never heard of Archimedes? - think Eureka!! ........................ and I am not referring to the EU. On the subject of water "screw Archimedes".
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