Rod McInnis wrote:
My suggestion is that the two rudders should be connected together via a
mechanical system and then use one hydraulic ram to operate both rudders,
rather than trying to use two hydraulic rams to operate each rudder. I have
used the two ram approach and have found that they are never in alignment.
It is easy to realign them, but I had to do it far more often than I liked.

This is good advice. Two seperate actuators ('rams') will not stay
synchronized with each other over any lengthy period of time or number
of cycles. It's a fluid system, not a locked train. That's why you also
need a rudder angle indicator on a hydraulic system rather than marking
a 'king spoke' on the wheel... the king spoke at center will be a
different spoke every time you go sailing!

Fresh Breezes- Doug King