[hpv-boats] Stabilisers

[Rick Willoughby]

Dennis
Some time ago I took a clip of one of my stabilises operating in calm  
water.

The boat is doing about 10kph in this clip:
http://www.rickwill.bigpondhosting.com/Stabiliser.wmv
The port stabiliser is doing exactly the same because the boat was  
level.  That is all they should be doing if set up right.  In waves  
they can be even set higher but I do not have easy adjustment to  
enable that.

The initial stability is related to the second moment of area of the  
water plane alone.  So what counts is how much moment you gain with a  
slight list.  Having a long flat stabiliser set about 1m from the  
centre of the main hull will rapidly increase the second moment of  
area with very little list.  Being long and slender the drag does not  
increase much if it is lightly loaded.  That is the objective I set  
out to achieve with the shape of my stabilisers.


Rick Willoughby