Stormyachts FDFH

Siochair said:
http://stormyachts.com/index.php?option=com_k2&view=item&layout=item&id=85&Itemid=32&lang=en

I quite like the sound of the "fast displacement hull form". There seems to be a bitj of a trend in making very efficient hull forms of late.
It looks as if the x-78 will make a nice long range boat.
Click to expand...

What is a fast displacement hull form? Surely it's either displacement or semi or planing. I can't believe that after all these years someone has discovered something that all naval architects have previously missed.

Maximum hull speed is the square root of waterline length x 1.25 - 1.33. Can't imagine that equation has suddenly changed.
 
I'm no expert but agree with longjohnsilver ... It's pretty well established how fast a displacement hulled boat will go relative to LWL and if you just shove more power in you basically just get a bigger bow wave. AFAIK the only way around it is with "unusual" (can't think of a better word) designs such as warships where they are very long and thin. The yacht under discussion doesn't seem to fit that description. ISTR that there was a proposal some years ago to go for very short "fat" warships that would also bend the usual rules (and provide a better platform for comms, weapons etc), but this yacht doesn't fit that description either. Surely must be semi-D and the long range achievable only in full displacement mode?
 
longjohnsilver said:
What is a fast displacement hull form? Surely it's either displacement or semi or planing. I can't believe that after all these years someone has discovered something that all naval architects have previously missed.

Maximum hull speed is the square root of waterline length x 1.25 - 1.33. Can't imagine that equation has suddenly changed.
Click to expand...

Yes, I think it's a way of trying to make "semi-displacement" sound sexy. :)
 
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