FAST2011 Conference Papers Available

Papers from the FAST2011 conference are available for free from the
American Society of Naval Engineers website.

https://www.navalengineers.org/Proc...CTID=0x01200060867377CFB0AE44BC62AAB482F95F79

There are many papers about the T-Craft, a hybrid vessel that operates as a
catamaran, surface effect ship (SES), and air-cushion vehicle (ACV).

The design of such a vessel is a very challenging process, involving many
different factors, systems and processes. My interest is in the hydrodynamics,
so I posted the link here

 

Nice one Leo

Shame it is individual paper download though...

 

Thank you Leo!
Is there no table of contents on the site? It's hard to figure out what are those papers about based on just the name of the author.

 

No, sadly. I just stumbled into the directory from a google search.

 

Here is the list of papers and authors from the conference.


http://www.fast2011.com/documents/Fast2011TechnicalProgram.PRELIMINARY.2011-09-23.pdf

 

After looking more closely, the list is presenters and does not always line up with authors.

 

Thanks for the link, Leo! The program was a bit 'thin' from my persepctive, with nothing presented from our T-craft team, but its always good to read about what the others accomplished and what they had to say about it.

I'm not so sure that T-craft is completely 'dead and buried' yet, although its future survival would probably be a version that does not include the fully amphibious capability.

 

It was a bit thin, but there are several papers of interest to me
because I'm trying to put together some practical examples to bundle
with a program to estimate SES performance.

I have spent far too much time this last week looking for reasonable
dimensions for SES and hybrid vessels. My main problem is trying to
produce a selection of sidehulls, some that can accommodate waterjets
in the stern, and others that can be used with props, as in Textron's
HCAC (a patent for which was surprisingly extended recently).

The T-Craft seems to be a good example to include, especially because
my program can calculate the drag of a split-cushion arrangement that
reduces the low speed resistance by at least 50%. That should be fun for
students to play with.

All the best,
Leo.

 

Thanks for those links, many of the papers seem to be "crosswise identifyable".

 

Having looked through the list of papers, it seems T-Craft dominated (why??..it is just an SES), and as you say thin on the ground to. Sign of the times!

 

I think it was because of the number of groups investigating different aspects
of the T-Craft. Many seemed to have decided on submitting to FAST.
Without those papers it would have been a very thin gruel.

 

The drag reduction benefits that have been analytically derived for divided cushion SES' look remarkably promising. My own involvement with the Textron T-craft model was somewhat limited though, to only the fabrication and testing support of the active control system that modulated the pressure/airflow in each cushion segment.

 

That. There is precious little activity in any HPMV area these days. The jam-packed FAST conferences from back in the 'goo old days' when private and govt. entities in 20 countries were simultaneously pursuing HPMV developments seem to be gone forever.

 

Some analytic predictions have been validated with towing tank
experiments recently.

The attached graph shows my predictions of the total resistance of a
1993 tonne SES with similar proportions to one designed and tested by
JJMA and Alion Science. The high-speed performance was good, but they
had trouble getting enough endurance out of the vessel at a "transit"
speed of 18.5 knots. As can be seen, the resistance is quite high for both
the catamaran and the SES with uniform cushion pressure.

The solution seems to be to operate as a "pure" catamaran for speeds up
to about 16 knots. For speeds between 16 and 22 knots, it is best to
use a split cushion system with a high pressure in the centre sub-cushion
and lower pressures in the fore and aft cushions. At high speeds, a
singe cushion with a uniform pressure works well.

The potential drag reduction at 18 knots is is certainly very promising.

 

Is this data with the same hull form and same displacement?