[hpv-boats] V15 hull length speed limited ?

[Rick Willoughby]

Hull speed is a defined parameter based on boat length and the  
gravity constant.  It does not have any significance for any slender  
hull as there is no measurable wave hump.  The drag goes up in  
proportion to the square of the speed.

The wave piercing requirement only applies to ambient waves; not  
anything to do with waves produced by the hull.  The aim is to pass  
through the ambient waves rather than being slowed down by them.   
This is not difficult with slender hulls but they have a tendency to  
dive into the back of waves when going downwind.  My new deckline  
with the "V" shape at the bow parts the waves neatly and does not get  
forced down once underwater.

Since the hull is wave piercing instead of the other kind,does it  
still experience the maximum speeds limited to hull length like sail  
boats ?


Rick Willoughby
rickwill at bigpond.net.au
03 9796 2415
0419 104 821