bow bulb design

Digging around and found this paper on bulb design. Most of us don't do ships but could be usefull to someone!

Jeff Maybe you could put in in with the links page along with P Bray's article?

http://www.gidb.itu.edu.tr/staff/insel/LectNotes/ShipDesign/KRACHT.pdf
BE PATIENT IT IS A SCANNED pdf
8Knots

 

This is the only definitive English-language translation of a broader work by Mr. Kracht on bulbous bow design. This section of his greater work covers only a small range of block coefficient hull forms. The complete work is published in German in another naval architectural proceedings. I have tried to get a copy of the original, but it is expensive (I'd have to buy the whole book, then have it translated). However, it seems to be the definitive work in the public domain for bulbous bow design. I referred to it heavily in my design of the bulbous bows on my line of Moloka'i Strait motoryachts.

Eric

 

Bulb bows

There is a ton of work on bulb bows in general though. There is a good general reference on ship resistance, including bulbs, that is part of the same series as Bhattacharya's book on ship motions.

Some of the most interesting are part of the recent papers in Transactions (2001 I think) by Francis Noblesse. He has a pretty simple method for optimizing bulbs without using viscosity, which seems to at least order the hull forms right - that is, it doesn't correctly predict the actual resistance, (no surprise given no viscosity) but it correctly predicts which hull is best.