S9086-C6-STM-010/CH-096R1 REVISION 1 NAVAL SHIPS’ TECHNICAL MANUAL CHAPTER 096 WEIGHTS AND STABILITY THIS CHAPTER SUPERSEDES CHAPTER 096 DATED 15 FEBRUARY 1976 DISTRIBUTION STATEMENT A: APPROVED FOR PUBLIC RELEASE; DISTRIBUTION IS UNLIMITED. PUBLISHED BY DIRECTION OF COMMANDER, NAVAL SEA SYSTEMS COMMAND. 2 AUG 1996 TITLE-1 @@FIpgtype@@TITLE@@!FIpgtype@@ S9086-C6-STM-010/CH-096R1 Certification Sheet TITLE-2 S9086-C6-STM-010/CH-096R1 TABLE OF CONTENTS Chapter/Paragraph Page 096 WEIGHTS AND STABILITY .............................. 96-1 SECTION 1. GENERAL ......................................... 96-1 096-1.1 STABILITY AND LOADING DATA .......................... 96-1 096-1.2 WEIGHT CONTROL ................................... 96-1 096-1.3 BALLAST INSTALLATION (SOLID OR LOCKED LIQUIDS) ........... 96-2 096-1.3.1 PURPOSE. ..................................... 96-2 096-1.3.2 NAVSEA RECORDS. ............................... 96-2 096-1.3.3 REPORT OF CHANGES. ............................ 96-2 096-1.4 REPORTS DESIRED BY NAVSEA ........................... 96-3 096-1.4.1 UNUSUAL CONDITIONS. ........................... 96-3 096-1.4.1.1 Excessive Rolling. .......................... 96-3 096-1.4.1.2 Heeling Due To Rudder Action. .................. 96-3 096-1.4.1.3 Excessive Pounding. ......................... 96-3 096-1.4.1.4 Inadequate Propeller Immersion. .................. 96-4 096-1.5 TONNAGE AND DISPLACEMENT ........................... 96-4 096-1.5.1 DEFINITIONS. .................................. 96-4 096-1.5.1.1 Displacement. ............................ 96-4 096-1.5.1.2 Conditions of Loading. ....................... 96-4 096-1.5.1.3 Standard Displacement. ....................... 96-4 096-1.5.1.4 Deadweight Tonnage. ........................ 96-5 096-1.5.1.5 Cargo Deadweight. ......................... 96-5 096-1.5.1.6 Admeasurement Tonnage. ...................... 96-5 096-1.5.2 TONNAGE CERTIFICATES. .......................... 96-5 096-1.5.2.1 Certificate Security and Disposition. ................ 96-6 096-1.5.3 CALCULATION OF ACTUAL DISPLACEMENT. .............. 96-6 096-1.5.3.1 Draft Marks. ............................. 96-7 096-1.5.3.2 Draft Diagram. ............................ 96-7 096-1.5.3.3 Displacement and Other Curves. .................. 96-7 096-1.6 COMPARTMENT TIGHTNESS AND TESTING .................... 96-7 SECTION 2. STABILITY: INCLINING EXPERIMENTS AND TRIM DIVES AND DEADWEIGHT DETERMINATION ........................ 96-7 096-2.1 GENERAL ......................................... 96-7 096-2.1.1 PURPOSE. ..................................... 96-7 096-2.1.2 NORMAL INCLINING METHOD. ....................... 96-8 096-2.1.2.1 Calculating Inclining Experiment Data. .............. 96-8 096-2.1.2.2 Availability of Data. ......................... 96-9 096-2.1.3 WHEN REQUIRED. ............................... 96-9 i S9086-C6-STM-010/CH-096R1 TABLE OF CONTENTS - Continued Chapter/Paragraph Page 096-2.1.4 PRELIMINARY DATA FOR NEW SHIPS. ................... 96-9 096-2.1.5 PREPARATION OF STABILITY DATA FOR THE BOARD OF INSPECTION AND SURVEY. ........................ 96-9 096-2.1.6 PRELIMINARY REPORT OF INCLINING EXPERIMENT AND TRIM DIVE. ...................................... 96-10 096-2.1.7 CONTRACTOR’S RESPONSIBILITY FOR NEW SHIPS. .......... 96-10 096-2.2 BOOKLET OF INCLINING EXPERIMENT DATA .................. 96-10 096-2.2.1 REFERENCE LINES. .............................. 96-11 096-2.2.2 ADDITIONAL INFORMATION. ........................ 96-11 096-2.3 SHIPBOARD PREPARATIONS FOR INCLINING EXPERIMENT ......... 96-11 096-2.3.1 IMPORTANCE OF PREPARATION. ...................... 96-11 096-2.3.2 COOPERATION OF SHIPS FORCE. ...................... 96-11 096-2.3.3 STABILITY AT TIME OF INCLINING. .................... 96-11 096-2.3.4 FREE SURFACE AT TIME OF EXPERIMENT. ................ 96-11 096-2.3.5 LIST AND TRIM. ................................. 96-12 096-2.3.6 FORCES WHICH AFFECT HEEL. ....................... 96-12 096-2.3.7 WEIGHT TO COMPLETE AND WEIGHT TO DEDUCT. .......... 96-12 096-2.3.8 PERSONNEL ABOARD. ............................. 96-13 096-2.3.9 CHANGES DURING EXPERIMENT. ..................... 96-13 096-2.3.10 CHECKING OF DRAFT MARKS. ....................... 96-13 096-2.3.11 INCLINING WEIGHTS. ............................. 96-13 096-2.3.12 MEASURING INCLINATION. ......................... 96-13 096-2.3.13 MIDSHIP DRAFTS FOR SURFACE SHIPS. ................. 96-14 096-2.3.14 PHOTOGRAPHS. ................................. 96-14 096-2.4 CONDUCTING THE INCLINING EXPERIMENT AND SUBMARINE TRIM DIVE ........................................... 96-14 096-2.4.1 INVENTORY. ................................... 96-14 096-2.4.2 DRAFT READINGS. ............................... 96-15 096-2.4.3 DENSITY OF WATER. .............................. 96-15 096-2.4.4 WEIGHT MOVEMENTS. ............................ 96-15 096-2.4.5 MEASUREMENT OF INCLINATION. ..................... 96-15 096-2.4.6 PLOT OF TANGENTS. ............................. 96-15 096-2.4.7 DETERMINATION OF PERIOD OF ROLL CONSTANT. .......... 96-15 096-2.4.8 SUBMARINE TRIM DIVE. ........................... 96-16 096-2.5 CONTENTS OF INCLINING EXPERIMENT REPORT (PART 1) FOR SURFACE SHIPS AND SUBMARINES .............................. 96-17 096-2.5.1 GENERAL. .................................... 96-17 096-2.5.2 ARMAMENT, BOATS, SUBMARINE BATTERIES, BALLAST. ...... 96-17 096-2.5.3 SHIP IN CONDITION A-LIGHT SHIP. .................... 96-17 096-2.5.3.1 Semi-Permanent Weight Items. ................... 96-17 096-2.5.3.2 Transverse Moments. ........................ 96-18 096-2.5.4 CHANGES IN CONDITION A WEIGHT SINCE INCLINING. ....... 96-18 096-2.5.5 DISPLACEMENT AND CENTER OF GRAVITY AS INCLINED. ..... 96-18 ii S9086-C6-STM-010/CH-096R1 TABLE OF CONTENTS - Continued Chapter/Paragraph Page 096-2.5.6 FUNCTIONS OF WEDGE AREAS. ...................... 96-19 096-2.5.7 DISPLACEMENT AND CENTER OF GRAVITY IN CONDITIONS A AND A-1. .................................... 96-19 096-2.5.8 WEIGHT MOVEMENTS AND INCLINATIONS. ............... 96-19 096-2.5.9 WEIGHT TO COMPLETE, WEIGHT TO DEDUCT, AND WEIGHT TO RELOCATE. .................................. 96-19 096-2.5.10 VERTICAL MOMENT OF FREE SURFACE AS INCLINED. ........ 96-19 096-2.5.11 DIAGRAM SHOWING LOCATION OF DRAFT MARKS. ......... 96-20 096-2.5.12 REMARKS AND MISCELLANEOUS CALCULATIONS. .......... 96-20 096-2.6 CONTENTS OF INCLINING EXPERIMENT REPORT, (PART 2) STABILITY DATA FOR SURFACE SHIPS ONLY ........................ 96-20 096-2.6.1 STABILITY DATA FOR SURFACE SHIPS ONLY. .............. 96-20 096-2.6.1.1 Armament, Boats, Submarine Batteries, Ballast. ......... 96-20 096-2.6.1.2 Ship In Condition A-Light Ship. .................. 96-20 096-2.6.1.3 Changes in Condition A Weight Since Inclining. ......... 96-20 096-2.6.2 LOADING CONDITIONS INCLUDED IN REPORT. ............. 96-20 096-2.6.3 EXCESSIVE TRIM IN LOADING CONDITION. ............... 96-21 096-2.6.4 DISPLACEMENT AND OTHER CURVES. .................. 96-21 096-2.6.5 CROSS CURVES OF STABILITY. ....................... 96-22 096-2.6.6 DIAGRAM SHOWING LOCATION OF DRAFT MARKS. ......... 96-22 096-2.6.7 APPROXIMATE CHANGE IN METACENTRIC HEIGHT DUE TO ADDED WEIGHT. ............................... 96-22 096-2.6.8 SUMMARY OF LOAD ITEMS. ......................... 96-22 096-2.6.9 DETAILS OF LOAD ITEMS. .......................... 96-23 096-2.6.10 CORRECTION TO RIGHTING ARMS FOR FREE SURFACE. ....... 96-23 096-2.6.11 TANK CAPACITIES. ............................... 96-23 096-2.6.12 COMPARTMENT CAPACITIES. ........................ 96-23 096-2.6.13 TABLE OF FRAME SPACINGS. ........................ 96-24 096-2.6.14 REMARKS AND MISCELLANEOUS CALCULATIONS. .......... 96-24 096-2.7 CONDITIONS OF LOADING FOR SURFACE SHIPS ................ 96-24 096-2.7.1 DISTINCTIONS BETWEEN LIGHT SHIP AND VARIABLE LOAD. 96-24 096-2.7.1.1 Light Ship. .............................. 96-24 096-2.7.1.2 Variable Load. ............................ 96-24 096-2.7.2 DEFINITIONS OF CONDITIONS OF LOADING FOR SURFACE SHIPS. ......................................... 96-24 096-2.7.3 DETAILED DESCRIPTION OF CONDITIONS OF LOADING FOR SURFACE SHIPS. ............................... 96-25 096-2.7.3.1 Condition D-Full Load (Contractual). ............... 96-25 096-2.7.3.2 Condition D-Full Load (Departure). ................ 96-27 096-2.7.3.3 Condition E-Capacity Load Condition. .............. 96-27 096-2.7.3.4 Condition B-Minimum Operating Condition. ........... 96-28 096-2.7.3.5 Condition C-Optimum Battle Condition. .............. 96-29 096-2.8 CONTENTS OF INCLINING EXPERIMENT REPORT, (PART 2) DATA FOR SUBMARINES ..................................... 96-30 iii S9086-C6-STM-010/CH-096R1 TABLE OF CONTENTS - Continued Chapter/Paragraph Page 096-2.8.1 STABILITY AND EQUILIBRIUM DATA FOR SUBMARINES. ...... 96-30 096-2.8.2 LOAD TO SUBMERGE DETERMINATION. ................. 96-30 096-2.8.2.1 Armament, Boats, Submarine Batteries, Ballast. ......... 96-30 096-2.8.2.2 Condition A-Light Ship. ....................... 96-30 096-2.8.3 DETAILED CHANGES IN CONDITION A AND SUBMERGED DISPLACEMENT SINCE LAST INCLINING AND TRIM DIVE. .... 96-30 096-2.8.4 LOAD TO SUBMERGE AT TIME OF TRIM DIVE. ............. 96-30 096-2.8.5 DETAILS OF LOAD ON TRIM DIVE. .................... 96-30 096-2.8.6 SHIP IN CONDITION N-SURFACE, DIVING TRIM. ............ 96-31 096-2.8.7 SHIP IN CONDITION N-SUBMERGED. ................... 96-31 096-2.8.8 VARIABLE BALLAST IN CONDITION. ................... 96-31 096-2.8.9 CONDITION M-SURFACE DIVING TRIM. .................. 96-31 096-2.8.10 CONDITION M-SUBMERGED. .......................