> My recommendation for the problem of sinkage or floatation of the ball is
to
> make it such that it floats, but only barely.  Say, with a specific
gravity
> of 0.90 to 0.95 or so.  This will prevent it from getting hung up on
> obstacles above the water (the ball will simply get knocked downwards into
> the water for a short time), while keeping it off of any submerged
> obstacles.

This will get caught in the first pool that has an outlet under the water
surface.  Such things are common in caves.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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