Quote:
Originally Posted by rslifkin
That makes me think of an interesting point. You may end up with a tradeoff. The actuator type would be harder to back-drive, so it would likely use less power and make less heat (as it wouldn't need to provide as much motor torque to hold against water pushing on the rudder).
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These direct driven high torque motors usually have a integrated, but separate magnetic braking device, so that the no-speed torque does not need to be held actively and thus consumes very little torque/power. Maybe a separate positive locking pin would also be a good addition, like they have in the hydraulic fins usually.
Maybe this is where we could leave a place for (electro)hydraulics, for braking it is an excellent choice