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["WILLIAM JONES" <billj AT harborside.com>]

Sorry, nurses came to poke and prod me.  Anyway, I derived an answer using 
calculus, the derivation of which I'll share later.  It turns out to be 2 
feet.  In other words, let the pipe drop 2 feet, and the Ferris wheel have a 
4-foot drop.  The maximum power obtained ended up being about 80 watts, if I 
recall correctly.  The thing is, I've never seen this in a book, nor heard it 
from a guy in a white coat, so my confidence is somewhat low.  Hopefully 
everyone will chime in and say, "Why, everyone knows that, Bill."  In the 
absence of other info, I guess I'll go with my solution.
I'm going home tomorrow, so lots of stuff is happening today.