USS Mystery (SP-16)

	Mystery in 1916 or 1917.
History
United States
Name	USS Mystery (proposed)
Namesake	Previous name retained
Builder	Gas Engine and Power Company, Morris Heights, New York
Completed	1916
Acquired	Never
Commissioned	Never
Notes	Registered as SP-16 for potential U.S. Navy service
General characteristics
Type	Patrol vessel (proposed)
Length	58 ft 1.5 in (17.717 m)
Propulsion	Twin engines
Speed	27 knots

USS Mystery (SP-16) was the proposed designation for an armed motorboat that never actually served in the United States Navy.

Mystery was a private motorboat built in 1916 by the Gas Engine and Power Company at Morris Heights, New York. The U.S. Navy inspected her in early 1917 for possible World War I service as a patrol boat in the 3rd Naval District and she was registered accordingly with the naval section patrol designation SP-16. However, the Navy never took possession of or commissioned Mystery, and she remained in civilian hands throughout the war.

Notes

^ NavSource Online (at http://www.navsource.org/archives/12/170016.htm) describes her speed as "27 mph", implying statute miles per hour as used for ground vehicles, but presumably her speed in nautical miles per hour (knots) was intended. If the speed really is being provided in statute miles per hour, the speed in knots would be about 23.5.