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I think the difficulty with tracking straight is not
related to the thruster configuration but to the dynamic stability
characteristics of PSUB hulls. Very few subs have clean lines or anything
resembling a keel. To take a K boat, for instance, there must be all kinds of
strange turbulence going on in the MBT openings and the various underbelly
appendages. Snoopy is equally unstable running on the stern thruster or the side
thrusters.
This is just a theory, I have no way to substantiate
it.
Alec From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Emile Sent: Friday, November 17, 2006 6:17 AM To: personal_submersibles@psubs.org Subject: RE: [PSUBS-MAILIST] Maneuvering Another issue with side thrusters alone is that it is
virtually impossible to drive the boat in a straight line. I spent a season
operating Leo, and it was quite a lesson after all the years with that big,
dependable Perry wheel chunking around behind you. What you end up doing is
setting both motors for transit, and then varying the power on one to hold
the compass course. It is the same with the
sgt, Peppers with ist fixed 4 thrusters and 1 main engine. On surface transit it
looks like you’ve drunk way to much; especially with wind and
waves. A gyro autopilot is
complicated but should be nice. Without ,too much of your attention just for
keeping coarse. Regards,
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