GL: Hyper Mileing - Twin Engines

[Dr Michael Hechtkopf]

>> In the Erie Canal, I slowed one engine gradually, then stopped it. > The
Autpilot was on but it couldn't handle the change in power and > steered
off-course dramatically. I went to manual steering. and > didn't think much of
it at the time.> > In the lock, I used both engines. When exiting, I
re-engaged the > autopilot as I often do. Again, it steered very
erratically!!!

I would not use one engine with the other one turned off because the prop
will turn any way while underway, potentially damaging the trasmission, i.e.,
the engine needs to be on to move the transmission fluid.  Some
boats have an override for this, but not many.  The shaft can be tied down
so it will not turn (difficult to do), but what happens if you need that
engine
immediately.  If the second engine is in neutral with the engine on, then the
transmission would be protected.
-Mike
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