According to the drawing below by Jim Backus, 1500 lbs were to be placed on the port side and another 1500 lbs were to be placed on the starboard side, with the weight's CG 13" aft of Station 5 (i.e. just aft of the saloon/engine bulkhead). This amount of ballast and in this location lessens the tug's roll period by increasing the tug's moment of inertia.
Tommy told me he put the 3000lbs of ballast in the keel because that would increase the tug's ultimate stability.
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