MIL-STD-2189/243-1, MILITARY STANDARD: DESIGN METHODS FOR NAVAL SHIPBOARD SYSTEMS (SECTION 243-1 - PART 1) PROPULSION SHAFTING (30 AUG 1994) [S/S BY MIL-HDBK-2189/243-1]., This document applies to the propulsion shafting design of all naval ships, surface and submarine, single- or multiple-shaft.