Max Hull speed and waterline length

Ducks are very light and very buoyant so don't create much of a wave. You could probably check this theory out by tying lead weights to its legs
 
Isn't it obvious? The duck starts moving forwards which creates a bow wave, but then starts feathering its foot to give lift, which raises the bird up and forwards over the bow wave. It's now sitting on the forward face of the wave, planing.
 
This paper http://jeb.biologists.org/content/53/3/763.full.pdf+html reported that the observed maximum sustained swimming speed of mallard (LWL 0.33m) was, at 0.70m/s, consistent with the calculated hull speed of 0.71 m/sec, and that above that speed a rapid increase in oxygen consumption occurred, implying that ‘… the swimming speed of the ducks is subject to constraints similar to those found in ships with conventional displacement hulls’.

Perhaps the OP should make better estimates of both his duck speeds and LWLs than the guessed values he gives?
 
Hydrozoan said:
This paper http://jeb.biologists.org/content/53/3/763.full.pdf+html reported that the observed maximum sustained swimming speed of mallard (LWL 0.33m) was, at 0.70m/s, consistent with the calculated hull speed of 0.71 m/sec, and that above that speed a rapid increase in oxygen consumption occurred, implying that ‘… the swimming speed of the ducks is subject to constraints similar to those found in ships with conventional displacement hulls’.

Perhaps the OP should make better estimates of both his duck speeds and LWLs than the guessed values he gives?
Click to expand...

How very dull.
what this thread needs is pictures...

DSCN2162.jpg
 
 
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