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between the motors.  As it turns out, the center motor was still in the way of the stern cannon and had to be removed and installed "backwards" above the packing tube using an o-ring drive or gear drive.  The motors are installed by attaching small sections of brass tube to the hull with epoxy, then slipping plastic wire ties through the brass and around the motors.  This is a system that has proven to work very well.

The bottom photo shows the running gear of the Scharnhorst, which is one of the most difficult ship hulls to outfit.  Three props and two rudders fit into a very small space, but it can be done.