Drag the ship on the sea chart, turn her, pick a target on the island. The solver works out each turret's bearing and elevation.
FIRE trains the turrets at their real 4°/s and flies every shell.
shell charge
Sea chart — drag the ship
The island — click a military structure (scroll to zoom)
Salvo results
Fall of shot, seen from the ship: grey = the target to scale · dashed = 95% of shells around the aim point (×) ·
coloured = each shell by turret, white ring = a hit · orange = civilian buildings · + = the salvo's centre.
Economics
Every shell
Salvo history
BB-61 — the three turrets, bow to the left
Firing solution
Pick a target on the island.
Side view along the line of fire (true scale)
The last 3 km (height ×4)
The mathematics
Parameters
The current solution, turret by turret
Trajectories: a point-mass shell in the standard atmosphere, its drag law fitted to the US Navy range tables and calibrated to reproduce every
published range (NavWeaps, 16"/50 Mark 7); checked in Python and here to the centimetre. Concrete penetration: NavWeaps' table (5,000 psi reinforced
concrete); through a roof the shell's path is the thickness divided by the sine of its angle of fall; below 15° of fall we call it a glancing blow (our rule).
Dispersion: the 1987 test shoot off Crete, shell-to-shell 0.36% of range, used as a circular normal spread per shell. Blast rings: DoD 4145.26-M (2008)
§C5.6.2 for ordinary buildings; fragments reach farther and are not drawn. Train limits (NavWeaps, 1980s): I ±139°, II ±126°, III ±128°; elevation up to 45°.
Gun heights above the sea (10, 13, 10 m) are our approximation. The island and everything on it are fictional.