Hi Alan. Here's a pic of Dan Brewer's articulating arm powered by
inexpensive Bimba air cylinders filled with vegetable oil. He has a tiny
electric pump and reservoir inside the sub. Not fancy, but effective. If memory
serves me, the frame was all aluminum channel he scrounged some where, with
stainless pins at the joints. He installed a "disk" type thru-hull with all the
oil line penetrations in one spot. He's a good fabricator and his sub has quite
a few innovative design elements. He took me for a night dive in it and it was a
BLAST !
Frank D.
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