APPENDIX 1 



Symbols and Their Titles 



Xl.l General 900 



X1.2 List of Symbols and Titles 900 



X1.3 Abbreviations for Positions and Conditions . 911 



X1.4 



X1.5 

 X1.6 



Abbreviations for Physical Concepts Having 



Scalar Dimensions 911 



Abbreviations for Units of Measurement . . 912 



Circular Constant Notation 913 



Xl.l General. This appendix lists all the 

 symbols employed in the text of Volume II except 

 for a few used and described or defined locally 

 and not having general application. It is identical, 

 except for one or two deletions, a few additions, 

 and minor modifications in titles, to the list of 

 symbols and their titles in Sec. XI. 5 of Appendix 1 

 of Volume I, pages 597-611. 



Notes relating to prior approval of these sym- 

 bols, subscripts for use with them, the method of 

 indexing, and abbreviations accompanying them 

 are found ui Sees. Xl.l, X1.2, X1.3, and X1.4 on 

 pages 596-597 of Volume I and need not be 

 repeated here. 



It is expected that a much more comprehensive 

 list of symbols and terms, with complete defini- 

 tions, in the form of a "Nomenclature for Hydro- 

 dynamics as Applied to Ship Design," will appear 



eventually as an SNAME pubhcation. In the 

 meantime, use can be made of the definitions in 

 SNAME Technical and Research Bulletm 1-12, 

 "Explanatory Notes for Resistance and Propul- 

 sion Data Sheets," July 1953. 



XI. 2 List of Symbols and Titles. 



a — Acceleration, linear 



a — Air-content ratio or relative air content 



a — Vortex spacing, transverse, in a vortex 

 street or trail 



A — Area in general; a projected area; area of 

 a transverse section of a body or ship, projected 

 on the transverse y-z plane 



Ay — Area, maximum centerplane, of a sub- 

 merged body or ship, projected on the x-z or 

 centerline plane; not to be confused with Al , 

 the lateral area of the underwater body of a 

 surface ship 



A^ — ^Area, maximum horizontal, of a submerged 

 body or ship, projected on the x-7j or baseplane; 

 not to be confused with A w , the waterplane area 

 of a surface ship 



A A — Area, abovewater, projected, at any 

 selected bearing or viewing angle 



Ab — Area, projected, of bow diving planes of a 

 submarine 



Ac — Area, projected chine, of a planing craft 



Ar> — Area, developed blade, of a screw pro- 

 peller, outside the boss or hub 



Ae — Area, expanded blade, of a screw pro- 

 peller, outside the boss or hub 



Ah — Area of any hydrofoil, projected on a 

 plane through the base chords, meanlines, or 

 equivalent lines 



Al — Area, lateral, of the underwater body of 

 a surface ship; not to be confused with Ay , the 

 maximum centerplane area of a submerged body 

 or ship, projected on the x-z or centerplane 



Am — Area, raidlength or midsection, of a ship, 

 midway between the forward and after perpen- 

 diculars 



900 



