Basic design of a high speed patrol boat

[sanjay]

Dear all,
I needed to know how to start the lines plan design of a high speed boat, Which method is most suitable for designing, and any guidance/help you can provide for the design.

thank u

 

[Mr Efficiency]

Needless to say, this is a major project, you might like to give more background detail of your part in it.

 

[daiquiri]

Agree with Mr. Efficiency.
Furthermore, the questons you are asking are really elementary. If you are a student, your teacher MUST have explained you the basics of ship design before assigning you such a task. If you are a professional designer or NA, then I better restrain from further comments...

 

[Stumble]

I would add that if you are neither a student or a professional and need to ask this question, then you have no business designing a high speed craft. The forces on high speed craft are so high that it takes an experienced pro to do this safely.

 

[frank smith]

something like this?

 

[hoytedow]

Acquire a model of PT-109 and start from there. It is a 67 year old design but a good one for training.

You may find this interesting: http://www.boatdesign.net/forums/boat-design/pt-305-a-33776.html

 

[frank smith]

PT boats are great. There was one in Stamford CT., at yacht haven west .
My father took me to see it when I was a kid . I wonder what happened to it ?

 

[mydauphin]

In todays world patrol boats would be larger and designed to operate alone. Pt where designed to operate in packs and have local support. You have to design mission better.

 

[Tad]

I don't know if it's an instructor problem (lack of direction), the students not listening or reading the assignment, or a translation problem........But there is tons of info available on the web......like this......http://www.danishyachts.com/PDF_vessels/PATROLBOAT_38m_brochure.pdf

It just makes things so easy......When I was student we had to go out in the rain and walk or take the bus to a library and search through books and magazines for this stuff.........

 

[daiquiri]

When I was student we had to go out in the rain and walk or take the bus to a library and search through books and magazines for this stuff.........

That was the best way to make sure that the stuff you'd find in those books and magazines would remain in your head. You surely wouldn't want to repeat that journey two or three times because you didn't pay attention or forgot the stuff you've just read.

Today the knowledge is everywhere around the internet, and the abundance of it has depreciated it's value, imho. We tend to not pay too much attention and to not memorize things because, hey, I can get back to that web page any time I want - so why should I struggle to keep in mind all that info? The value of the internet knowledge is also depreciated by the fact that a big part of it is just hearsay stuff, put together by anyone thanks to forums like this one and others, copy-pasted from other similar web pages, and hence never peer-reviewed or verified.

Regarding that pdf file and the GA plan at the page 4 - the ammunition store appear to be in a pretty vulnerable place? One good hit and both the command center and the wheelhouse are out of combat. I'm not an expert in military vessels, so perhaps what I've just said is a pure nonsense...

 

[Tad]

Maybe so daiq.............

But if I was the student beginning a project one source would not be enough........I would have at least 3 examples (and I know they're out there) and look at the trends......

I highly recommend Ship and Boat International, published by RINA, as an excellent reference for commercial vessel design.

 

[sanjay]

Thanks all for your valuable comments..

I am trying to design a high speed patrol boat of approx. 15 to 20m for coast guard with 25 to 30 knots speed.
I am a student and i am presently using townsend method of lines plan generation.
I understand your recommendations.
Thank u

 

[hoytedow]

25 to 30 knots speed is slow for a patrol boat.

 

[mydauphin]

and 20m is kind of small. You need big engines, big tanks and some weapons.
All this increases size. I guess it depends on what your patrolling.
Smaller patrol boats and usually outboard, gas powered, many rib design. these are usually day boats. No one sleeps on them.
Are people going to be sleeping on board? What is range required? Is it going to have to tow or double as a fire/rescue boat.