My English ship estimates

I have a spreadsheet that I last modified in 2003 for estimating characteristics of 17th Century English warships. Let us look at ships named Assistance, dating from 1650 to 1725:

Ship       Date Guns  LGD      LK       B       D       LK*B*D (LK*B*B/2)/94 Built
Assistance 1650 40-48 121.46ft 102ft    31ft    13ft    411.1 t 548.1 t    Deptford DY
Assistance 1687 40    121.46ft 102ft    32.33ft 13ft    428.7 t 571.6 t    Deptford DY
Assistance 1699 48    119.58ft 103.33ft 33.25ft 12ft    412.3 t 549.7 t    Deptford DY
Assistance 1712 50    132.13ft 108.92ft 35ft    14ft    535.5 t 713.7 t    Limehouse
Assistance 1725 50    134ft    109.75ft 36.06ft 15.17ft 600.6 t 760 t      Woolwich DY