shoaib_jaff
04-29-2006, 08:55 AM
sir,
I want the information/drawing regarding basic hull design of a stern trawler for my project.
I want the information/drawing regarding basic hull design of a stern trawler for my project.
View Full Version : hull design
Figgy
04-29-2006, 09:55 AM
Shoaib_jaff, You might think about being a little more nice when you request information. I understand you probably don't speak english very well, but some people might take offense to how you word questions. :)
As for the trawler, we need information too. It's not too hard to find HELP around here. If this is for school though, don't expect people on this fourm do do the work for you. If you can provide us with some particulars, maby we can get the ball rolling!
As for the trawler, we need information too. It's not too hard to find HELP around here. If this is for school though, don't expect people on this fourm do do the work for you. If you can provide us with some particulars, maby we can get the ball rolling!
SailDesign
04-29-2006, 04:45 PM
shoaib_jaff,
What Figgy is trying hard to say nicely is that we need more inforamtion about what you want, and why.
What size stern trawler? Where will it be used? Single or twin engines?
School project? If so, is it for a marine design course or a different subject that mases it hard for you to find the right information yourself?
Steve "ready to help, but waiting for info..."
What Figgy is trying hard to say nicely is that we need more inforamtion about what you want, and why.
What size stern trawler? Where will it be used? Single or twin engines?
School project? If so, is it for a marine design course or a different subject that mases it hard for you to find the right information yourself?
Steve "ready to help, but waiting for info..."
Guillermo
04-29-2006, 08:12 PM
Some info to begin:
http://www.fao.org/figis/servlet/vesseltype?fid=10
http://www.fao.org/figis/servlet/vesseltype?fid=30
http://www.fao.org/DOCREP/003/V9468E/v9468e0e.htm
http://www.fao.org/docrep/field/003/AB742E/AB742E04.htm
http://www.fao.org/figis/servlet/vesseltype?fid=10
http://www.fao.org/figis/servlet/vesseltype?fid=30
http://www.fao.org/DOCREP/003/V9468E/v9468e0e.htm
http://www.fao.org/docrep/field/003/AB742E/AB742E04.htm
SeaSpark
04-29-2006, 08:54 PM
Great information Guillermo.
Figgy, think Shoaib Jaff was very polite not many threads start with "Sir,".
"i am looking for" sounds better then "i want" even i, as a non native english writer i must agree, still think Shoaib did his best.
Figgy, think Shoaib Jaff was very polite not many threads start with "Sir,".
"i am looking for" sounds better then "i want" even i, as a non native english writer i must agree, still think Shoaib did his best.
shoaib_jaff
04-30-2006, 07:19 AM
sail design, i havent fixed my dimensions yet, i just need to have look at the lines plan of a stern trawler for an idea.
by the way its not for school , its a project for bachelors degree in naval architecture.
by the way its not for school , its a project for bachelors degree in naval architecture.
Figgy
04-30-2006, 09:36 AM
Figgy, think Shoaib Jaff was very polite not many threads start with "Sir,"."i am looking for" sounds better then "i want" even i, as a non native english writer i must agree, still think Shoaib did his best.
It was a friendly piece af advice, thats all. I wasnt offended, and I wasnt critiquing his english, just letting him know some people can be sensitive. I want to see him get replies.
Shoaib_jaff, good luck with your project!
It was a friendly piece af advice, thats all. I wasnt offended, and I wasnt critiquing his english, just letting him know some people can be sensitive. I want to see him get replies.
Shoaib_jaff, good luck with your project!
Guillermo
04-30-2006, 07:35 PM
... i havent fixed my dimensions yet, i just need to have look at the lines plan of a stern trawler for an idea....
I can scan some for you at my office and post them here, but I need to know size or any other desing basic determining factors?
You could also buy some books on the matter, for example:
http://www.antiqbook.com/boox/sea/031520.shtml
http://www.amazon.com/gp/product/0852381905/ref=sip_pdp_dp/103-2216474-5569422?%5Fencoding=UTF8&v=glance&n=283155
http://www.amazon.com/gp/product/0852380437/ref=sip_pdp_dp/103-2216474-5569422?%5Fencoding=UTF8&v=glance&n=283155
I recommend you a visit to:
http://www.soi.wide.ad.jp/class/20020017/slides/03/2.html
And download:
http://www.shipmotion.se/Download/Guide%20to%20Stability.pdf
Cheers.
I can scan some for you at my office and post them here, but I need to know size or any other desing basic determining factors?
You could also buy some books on the matter, for example:
http://www.antiqbook.com/boox/sea/031520.shtml
http://www.amazon.com/gp/product/0852381905/ref=sip_pdp_dp/103-2216474-5569422?%5Fencoding=UTF8&v=glance&n=283155
http://www.amazon.com/gp/product/0852380437/ref=sip_pdp_dp/103-2216474-5569422?%5Fencoding=UTF8&v=glance&n=283155
I recommend you a visit to:
http://www.soi.wide.ad.jp/class/20020017/slides/03/2.html
And download:
http://www.shipmotion.se/Download/Guide%20to%20Stability.pdf
Cheers.
CET
04-30-2006, 08:23 PM
sir,
I want the information/drawing regarding basic hull design of a stern trawler for my project.
Figgy, your first response might have been a little more “nice” if you had to compose it in another language!
I applaud shaoib_jaff for having the cajones to post his query from India on an English forum. Best of luck to you, shaoib_jaff. I wish I had an answer to your questions.
CET
I want the information/drawing regarding basic hull design of a stern trawler for my project.
Figgy, your first response might have been a little more “nice” if you had to compose it in another language!
I applaud shaoib_jaff for having the cajones to post his query from India on an English forum. Best of luck to you, shaoib_jaff. I wish I had an answer to your questions.
CET
shoaib_jaff
05-01-2006, 03:53 AM
hey everybody,
thats enough for figgy, just leave it. I thank thim for correcting me,though his approach was little different. after all we are learners first and then advisors
thats enough for figgy, just leave it. I thank thim for correcting me,though his approach was little different. after all we are learners first and then advisors
shoaib_jaff
05-01-2006, 03:57 AM
guillermo,
i appreciate your concern for me, i have decided to design a freezer trawler of about 45-50 m in length.
do you recommend a freezer trawler for indian ocean,
secondly, what type of propulsion would be preferable single/twin screw
i appreciate your concern for me, i have decided to design a freezer trawler of about 45-50 m in length.
do you recommend a freezer trawler for indian ocean,
secondly, what type of propulsion would be preferable single/twin screw
Guillermo
05-01-2006, 04:19 AM
....i have decided to design a freezer trawler of about 45-50 m in length.
do you recommend a freezer trawler for indian ocean...
A 45-50 m stern trawler most probably should be a freezer, as she is not a day or short trips boat. But size is not the departure point. What you do need to know first is which species are you planning to fish and then the volume of hold required, the duration of fishing labours to fill it (so how many days in the fishing grounds) and duration of voyage to those fishing grounds. Also the depth and kind of the trawling and if there is going to be some processing aboard other than freezing. From all that you work out crew, vessel size, power and fuel needed. And the designing spiral begins...
... what type of propulsion would be preferable single/twin screw..
I do not know twin screwed trawlers....Well, yes, I saw one built in a Galician boatyard for the Mediterranean! That's the only one.
To have an idea about vessels the size and function you need, you should do some google searching. Just type : Stern Trawler Sale, or the like.
do you recommend a freezer trawler for indian ocean...
A 45-50 m stern trawler most probably should be a freezer, as she is not a day or short trips boat. But size is not the departure point. What you do need to know first is which species are you planning to fish and then the volume of hold required, the duration of fishing labours to fill it (so how many days in the fishing grounds) and duration of voyage to those fishing grounds. Also the depth and kind of the trawling and if there is going to be some processing aboard other than freezing. From all that you work out crew, vessel size, power and fuel needed. And the designing spiral begins...
... what type of propulsion would be preferable single/twin screw..
I do not know twin screwed trawlers....Well, yes, I saw one built in a Galician boatyard for the Mediterranean! That's the only one.
To have an idea about vessels the size and function you need, you should do some google searching. Just type : Stern Trawler Sale, or the like.
shoaib_jaff
05-01-2006, 04:37 AM
guillermo,
generally, what is the hold capacity for a freezer?
if duration of voyage is 1 day
depth 3800 m
stern trawling
generally, what is the hold capacity for a freezer?
if duration of voyage is 1 day
depth 3800 m
stern trawling
Guillermo
05-01-2006, 04:45 AM
shoaif_jaff,
I don't want to be rude, but you should do some homework first, before asking again.
Cheers
I don't want to be rude, but you should do some homework first, before asking again.
Cheers
shoaib_jaff
05-01-2006, 05:03 AM
guillermo,
i am sorry for my conduct,
before fixing the preliminary dimensions, we have to collect parent ship data
i thought that you could help me with the parent ship data, thats all
i am sorry for my conduct,
before fixing the preliminary dimensions, we have to collect parent ship data
i thought that you could help me with the parent ship data, thats all
Guillermo
05-01-2006, 07:29 AM
...i thought that you could help me with the parent ship data, thats all
1 day voyage for a 50m stern trawler and a 3800 m trawling depth sound quite weird to me. I do not know if there is net handling machinery for such an extreme depth. What's the intended base port and fishery? As you probably know, a moratory on deep sea bottom trawling is being internationally considered, due to its pernicious effect on some habitats (http://news.bbc.co.uk/1/hi/sci/tech/4308156.stm)
Please, do not post information little by little about your design determining factors, or I'll not be happy about helping (And probably others either). Just post all you already know or want to know about. That's more fair.
Cheers.
P.S.
“In recent years in India, the major thrust in fisheries development has been on optimizing production and productivity, augmenting export of marine products, generating employment and improving the welfare of fishermen and their socio-economic status. Fishing efforts are largely confined to the inshore waters through artisanal and mechanized sectors. About 90 per cent of the present production from the marine sector is within a depth range of up to 50 to 70
metres and the remaining 10 per cent from depths extending up to 200 metres. While 93 per cent of the production is contributed by artisanal and motorized sectors, the remaining seven per cent is contributed by deep sea fishing fleets confining their operation mainly to the shrimp grounds in the upper east coast."
On indian fisheries:
http://www.hinduonnet.com/businessline/2001/08/03/stories/080305g1.htm
http://www.fao.org/documents/show_cdr.asp?url_file=/DOCREP/006/Y4849E/y4849e09.htm
http://countrystudies.us/india/107.htm
From the Indian "Integrated Fisheries Project":
"Experimental Deep Sea Fishing to test commercial feasibility:
As more and more fishing effort to be diverted to areas beyond traditional fishing limits, the expertise available with the Project has to be deployed to conduct intensive fishing operations in grounds where sizeable resource potential is indicated through exploratory surveys by vessels of Fishery Survey of India. Such intensive fishing would generate data needed to make investment decisions by entrepreneurs besides demonstrating to the industry the technology suitable for exploitation of such reserves."
Cheers.
1 day voyage for a 50m stern trawler and a 3800 m trawling depth sound quite weird to me. I do not know if there is net handling machinery for such an extreme depth. What's the intended base port and fishery? As you probably know, a moratory on deep sea bottom trawling is being internationally considered, due to its pernicious effect on some habitats (http://news.bbc.co.uk/1/hi/sci/tech/4308156.stm)
Please, do not post information little by little about your design determining factors, or I'll not be happy about helping (And probably others either). Just post all you already know or want to know about. That's more fair.
Cheers.
P.S.
“In recent years in India, the major thrust in fisheries development has been on optimizing production and productivity, augmenting export of marine products, generating employment and improving the welfare of fishermen and their socio-economic status. Fishing efforts are largely confined to the inshore waters through artisanal and mechanized sectors. About 90 per cent of the present production from the marine sector is within a depth range of up to 50 to 70
metres and the remaining 10 per cent from depths extending up to 200 metres. While 93 per cent of the production is contributed by artisanal and motorized sectors, the remaining seven per cent is contributed by deep sea fishing fleets confining their operation mainly to the shrimp grounds in the upper east coast."
On indian fisheries:
http://www.hinduonnet.com/businessline/2001/08/03/stories/080305g1.htm
http://www.fao.org/documents/show_cdr.asp?url_file=/DOCREP/006/Y4849E/y4849e09.htm
http://countrystudies.us/india/107.htm
From the Indian "Integrated Fisheries Project":
"Experimental Deep Sea Fishing to test commercial feasibility:
As more and more fishing effort to be diverted to areas beyond traditional fishing limits, the expertise available with the Project has to be deployed to conduct intensive fishing operations in grounds where sizeable resource potential is indicated through exploratory surveys by vessels of Fishery Survey of India. Such intensive fishing would generate data needed to make investment decisions by entrepreneurs besides demonstrating to the industry the technology suitable for exploitation of such reserves."
Cheers.
RANCHI OTTO
05-01-2006, 06:12 PM
Guillermo is a precious source of informations..thanks!
khokan
05-02-2006, 06:54 AM
Can anyone help me with the basic fundamentals of Ship Hull Detail Design? i want to know about Ship Hull Detail Design in detail. if u have any softcopy of books/documents
Thanx in advance for ur reply.
Regards
Khokan
Thanx in advance for ur reply.
Regards
Khokan
PNACS
05-02-2006, 09:32 AM
Principles of Naval Architecture: Volume I - Stability and Strength ( Add to shopping cart )
Author: Edward V. Lewis, Ed.
The Societys premier reference work, a revision of the 1967 publication on naval architecture covering ship's geometry, stability, flooding, strength, resistance and propulsion, vibration, ship controllability and motion in waves. A must-have reference for anyone involved in naval architecture.
[PNA I] 1988, Hardbound, 3 lbs.
ISBN # 0-939773-00-7
List Price: $105.00
visit www.sname.org
Author: Edward V. Lewis, Ed.
The Societys premier reference work, a revision of the 1967 publication on naval architecture covering ship's geometry, stability, flooding, strength, resistance and propulsion, vibration, ship controllability and motion in waves. A must-have reference for anyone involved in naval architecture.
[PNA I] 1988, Hardbound, 3 lbs.
ISBN # 0-939773-00-7
List Price: $105.00
visit www.sname.org
SailDesign
05-02-2006, 10:08 AM
Guillermo is a precious source of informations..thanks!
I'd like to add my vote to that one. Guillermo is amazing.
Steve
I'd like to add my vote to that one. Guillermo is amazing.
Steve
Guillermo
05-02-2006, 11:02 AM
Stev & Ranchi: Thanks a lot, but stop the crawling....:P
shoaib: Something for you: Not within your strange specs, but a modern deep sea stern trawler (You'll have to learn some Spanish, sorry :rolleyes: )
DESCRIPCIÓN: Pesquero congelador de arrastre por popa
AÑO DE CONSTRUCCIÓN: 2002
CARACTERÍSTICAS PRINCIPALES
Eslora total 55,64 m.
Eslora entre perpendiculares 49,45 m.
Manga 11,60 m.
Puntal a la cubierta principal 7,90 m.
Puntal a la cubierta segunda 5,20 m.
Calado de trazado 5,20 m.
Arqueo bruto (1969) 1.222 GT
CLASIFICACIÓN
LRS+100A1, Stern Trawler, + LMC, UMS
CAPACIDADES
Bodega 884 m³
Combustible 211 m³
Capacidad de agua dulce 76 m³
Aceite 3,4 m³
POTENCIA Y VELOCIDAD
Motor principal WARTSILA 2.760 Kw
Velocidad en pruebas 14,00 nudos
Autonomía 6.500 millas
Grupos auxiliares 2 x 632 Kw
Alternador de cola 1200 Kw
TRIPULACIÓN
Dotación 18
PLANTA DE CONGELACIÓN
Capacidad para congelar 77 Tons. por día en 11 armarios de placas de 15 Tons. por día en túnel de congelación
shoaib: Something for you: Not within your strange specs, but a modern deep sea stern trawler (You'll have to learn some Spanish, sorry :rolleyes: )
DESCRIPCIÓN: Pesquero congelador de arrastre por popa
AÑO DE CONSTRUCCIÓN: 2002
CARACTERÍSTICAS PRINCIPALES
Eslora total 55,64 m.
Eslora entre perpendiculares 49,45 m.
Manga 11,60 m.
Puntal a la cubierta principal 7,90 m.
Puntal a la cubierta segunda 5,20 m.
Calado de trazado 5,20 m.
Arqueo bruto (1969) 1.222 GT
CLASIFICACIÓN
LRS+100A1, Stern Trawler, + LMC, UMS
CAPACIDADES
Bodega 884 m³
Combustible 211 m³
Capacidad de agua dulce 76 m³
Aceite 3,4 m³
POTENCIA Y VELOCIDAD
Motor principal WARTSILA 2.760 Kw
Velocidad en pruebas 14,00 nudos
Autonomía 6.500 millas
Grupos auxiliares 2 x 632 Kw
Alternador de cola 1200 Kw
TRIPULACIÓN
Dotación 18
PLANTA DE CONGELACIÓN
Capacidad para congelar 77 Tons. por día en 11 armarios de placas de 15 Tons. por día en túnel de congelación
shoaib_jaff
05-03-2006, 10:01 AM
guillermo,
thanks for the valuable information!
i have couple of questions regarding the design problem (dont misunderstand me i am a learner)
which one is better sections for trawler: normal/ knuckle / u / v?
which one is used bulbous / racked bow for trawlers in modern design?
why a slight rack is given for a keel in trawlers? ( i have seen in some design)
do we use a skeg for better maneouverability in modern design of trawlers? (now-a days bow thrusters are mostly used)
which one is used in modern design: a sheer deck or a forecastle deck?
is camber necessary for trawlers?
thanks for the valuable information!
i have couple of questions regarding the design problem (dont misunderstand me i am a learner)
which one is better sections for trawler: normal/ knuckle / u / v?
which one is used bulbous / racked bow for trawlers in modern design?
why a slight rack is given for a keel in trawlers? ( i have seen in some design)
do we use a skeg for better maneouverability in modern design of trawlers? (now-a days bow thrusters are mostly used)
which one is used in modern design: a sheer deck or a forecastle deck?
is camber necessary for trawlers?
PNACS
05-03-2006, 11:14 AM
Hi Shoib,
Being a Naval Architecture Student you shoud be able find answers to all these questions by yourself from basics you have learnt over last 6-7 semesters. For example, raked Bow OR bulbous bow?. You could find the answers from basics you have learnt in resistance part of Naval architecture (Remember..... or flip back to those chapters in PNA, the advantage of bulbous bow is for a certain rage Froud Number). Cant you work out hull form by iterating/optimizing between effect of LCB on resistance, Required forward hold volume, angle of entrance etc etc).? The Skeg is for directional stability. Skeg will not add to maneouverability of your vessel. Based on Class rules, find minimum bow height required & decide if u need a forecastle deck.
All the Best!!
Being a Naval Architecture Student you shoud be able find answers to all these questions by yourself from basics you have learnt over last 6-7 semesters. For example, raked Bow OR bulbous bow?. You could find the answers from basics you have learnt in resistance part of Naval architecture (Remember..... or flip back to those chapters in PNA, the advantage of bulbous bow is for a certain rage Froud Number). Cant you work out hull form by iterating/optimizing between effect of LCB on resistance, Required forward hold volume, angle of entrance etc etc).? The Skeg is for directional stability. Skeg will not add to maneouverability of your vessel. Based on Class rules, find minimum bow height required & decide if u need a forecastle deck.
All the Best!!
Guillermo
05-03-2006, 11:55 AM
shoaib_jaff:
which one is better sections for trawler: normal/ knuckle / u / v?
which one is used bulbous / racked bow for trawlers in modern design?
U sections. Bulbous bow for long rangers, but as you are talking about a 1 day trip :confused:, you really don't need it.
why a slight rack is given for a keel in trawlers? ( i have seen in some design)
To create space to locate a big diameter propeller, if I understood your question correctly.
do we use a skeg for better maneouverability in modern design of trawlers? (now-a days bow thrusters are mostly used)
If you use a rudder, you usually use skegs to support it with this type of vessels, if I properly understood your question. :confused:
Ducted propeller, rudder and bow thruster are nowadays commonly used.
which one is used in modern design: a sheer deck or a forecastle deck?
Or even a full length sheltered working deck with net whinches forward. Depends on net handling system and working space needings. You have to work out that.
is camber necessary for trawlers?
For weather decks, yes. Usually it's given to all decks.
Attached find a present for you. The lines of a 36 m LOA stern trawler.
Hope this is useful. I think you now ow me $.20 ;)
Cheers.
which one is better sections for trawler: normal/ knuckle / u / v?
which one is used bulbous / racked bow for trawlers in modern design?
U sections. Bulbous bow for long rangers, but as you are talking about a 1 day trip :confused:, you really don't need it.
why a slight rack is given for a keel in trawlers? ( i have seen in some design)
To create space to locate a big diameter propeller, if I understood your question correctly.
do we use a skeg for better maneouverability in modern design of trawlers? (now-a days bow thrusters are mostly used)
If you use a rudder, you usually use skegs to support it with this type of vessels, if I properly understood your question. :confused:
Ducted propeller, rudder and bow thruster are nowadays commonly used.
which one is used in modern design: a sheer deck or a forecastle deck?
Or even a full length sheltered working deck with net whinches forward. Depends on net handling system and working space needings. You have to work out that.
is camber necessary for trawlers?
For weather decks, yes. Usually it's given to all decks.
Attached find a present for you. The lines of a 36 m LOA stern trawler.
Hope this is useful. I think you now ow me $.20 ;)
Cheers.
SailDesign
05-03-2006, 12:42 PM
I'll give Guillermo an A for this homework assignment :)
shoaib_jaff
05-03-2006, 02:04 PM
i thank everybody for helping me in one way or the other
special thanks to GUILLERMO
i had enough from him for starting my project, now no more question will be asked by me.
i will contact you again guillermo, if needed.........
you helped me from the scratch....
with all your support i will be able to design a better trawler
regarding the $0.2, i can send you a copy of my project when its complete, just send me our mailing address.
thanks again...............
special thanks to GUILLERMO
i had enough from him for starting my project, now no more question will be asked by me.
i will contact you again guillermo, if needed.........
you helped me from the scratch....
with all your support i will be able to design a better trawler
regarding the $0.2, i can send you a copy of my project when its complete, just send me our mailing address.
thanks again...............
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