Gday Ken
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What it needs is some young smarty-brains to design and develop a home-made direct drive mount from bits in his shed
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One ( at least ) already did, ( tho i dont know how good it really is )
http://www.mda-telescoop.com/index.p...tpage&Itemid=1
IIRC there was a thread on this gizmo about a year back.
There was also a mob called NORTEK who did encoder mods
for Meades ( 14" and 16" ) to put absolute encoders on the output shafts.
Once you can get a true reading of the output shaft,
the drive mechanism,
ie direct drive, worm drive or water wheel powered clepsydra becomes irrelevant.
The clepsydra would probably have a prohibitively slow max slew speed tho
Andrew