[PUP] PPM - Stability & Comfort

[John Harris]

Tad,

I think you make a good point i.e. "similar type"
is very important.  My experience would suggest that a similar vessel length 
width and draft of a sailboat and a power boat are still VERY different.

I conclude that comparing one or the other by the formula would be 
interesting but not one WITH the other.  The sailboat - given the sails are 
up and the mast is in place - has a very different axial frequency and 
damping that a power boat unless you at least add stabilizers or paravanes 
to the power boat.  Maybe then they can be compared.

New item . . . .

My observation is that a Nordhavn 57 or larger with "modern" variable gain 
stabilizers set for flattest performance is VERY much flatter than any 
similar sized power boat equipped with paravanes in flat to moderately heavy 
seas but not necessarily more comfortable - because it is so stiff as to be 
a little jumpy, and produce significant horizontal motion instead of a soft 
roll.

Other observations ??

John Harris
World Odd @ Sea 


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