Hull Design Project

[BWJF]

Hi everyone

I am a student at the Fisheries and Marine Institute of Memorial University. I have to design a ship in my third year and I have decided to design a 20 metre ocean going motor yacht. I am thinking about a 5m Beam and a 1.5-2.0 m draft. Will some please enlighten me about good L/B and B/T ratios and good block and prismatic coefficients that will keep resistance to a minimum and enhance seakeeping characteristics. Also, it would be greatly appreciated if someone could point me to a good systematic series or regression analysis to acurately predict the resistance for this type of hull.

Thanks

BWJF

[gonzo]

There is no proper answer. Boats are complex designs that involve many aspects. If you really have no idea, maybe the first thing is to read some basic textbooks. For example, "Elements of Yacht Design", "Principles of Yacht Design", "Elements of Strenght" and The Common Sense of Yacht Design". Without the basic knowledge any advice would be useless.

[CDBarry]

I've judged a number of student projects at the USNA and the USCGA.

The key elements are:

1) Determining requirements
2) Determining key parameters (length, etc.) to meet the requirements.

Don't be pulling things like length, beam etc. out of thin air - you need a rational process to get there - essentially a ship synthesis approach. This is relatively straight forward with spreadsheets, but you have to do it in a rational manner.

Then you can start determining the fine points afterwards, otherwise you will just churn around in circles - also your proffesor know this as well, and will be, first and foremost, looking for a reasoned approach, even for a yacht.