This motorship-dot-com article has me interested in remodeling my cruiser/destroyer type hull to find out if the hydros in DS can show me benefits for a slender naval hull. Granted, i doubt DS Free (or even Pro) can mimic the effects of compressed air reducing the reported friction. Reportedly, the "patented hull" will help reduce CO2 emissions.

I suppose that if putting gondola/pram/other convex type configurations in my model shows improvements (i got some in the stern, but i'm thinking the reversed curvature simply removed from the "below waterline surface area" surface otherwise used in the calculations.

I'm really annoyed when patents are issued for things that nature is quite unambiguous about. If the pumps arrangements are patented, fine, but if by nature a simple, unaided hull with bulges configured based on mathematical reductions in resistance gets patented, then that is just not very couth. Besides, SOOOOO much in naval architecture is left unpatented simply for the good of the profession. Manufacturers themselves might patent things, mechanical things, even processes, but if naval architects and engineers didn't share enough information, we'd likely not even have nice, support-worthy products such as DELFTship Free! to help pros and hobbyists who want to skip all the mind-bending minutae seen in other apps.

From the same publication, on page 12, there is an article about the Mewis Duct and Becker rudder combo on a ship, the combo which reportedly reduction by 3% for small ships, and up to 10% for bulkers and large tankers. This is said to be virtually unaffected by draft.

I wonder what gains would be had if prop location ducting hull tunneling were applied -- assuming no adverse impact on exit angles, wake flows, and so on.

What is the web site that this article on? I would like to read it also.

It's "Motorship", but this site prohibits full-on URLs, so i had to put text in the place of symbols. Currenlty, on the MOtorship site, there is nothing mentioned. I have the paper copy, so it might be an advance copy for marketing/steering reasons. I would have thought that the content would be on-line first for paying subscribers.

It might be in the site somewhere... maybe their CMS or tool hasn't made it visible. However, in the same issue, i read that Motorship was surveyed and it was learned that most of its readership is of professionals with very broad and deep backgrounds and that maybe 80% (IIRC) of their subscribers actually read and contribute comments...

IIRC, Borders Books is one store that has a number of yacht periodicals/mags. I think Motorship ( but definitely Boat Professional) can be found on the shelf at BB.

I left the mag at home, but i can reply tonight or in the AM (PST) with the pages discussing the Stenna vessel.

Hi. It's The Motorship, January 2010 issue, paper. But, it appears it's not in the on-line articles.

Sorry.