Ship Maneuverability

[el cid again]

Due to a lack of formal definitions, or sometimes, to problems with conventions used in AE, RHS
tries to use defined values.

Note, for example, that AE mostly used standard displacement for warships and gross registered tonnage
(which isn't displacement in any sense) rather than full load displacement (which all navies use for all vessels
because is represents the actual floatation capacity of a vessel). For this reason RHS uses full load displacement -
in all cases.

Surface ship maneuverability is considered to be mainly a function of how fast a naval unit can change its position.
The basic principle is that faster vessels change position by a greater amount in a tactical impulse. However,
larger ships ability to turn is less while smaller ships ability to turn is greater, so this is the rationale for
different values for different sizes of surface ships.

Submarine maneuverability is a function of speed, turning ability and the amount by which a submarine may change
its depth in a tactical impulse. Smaller submarines are able to turn faster and dive or climb faster than larger
ones are. For this reason, the influence of displacement on maneuverability is relatively greater than for surface
ships - subs may change depth as well as turn.

Naval Unit Maneuverability (M)

Surface Ship Maneuverability:
Very Large Ships with full load displacements over 40,000 tons: M = 90% of full speed in knots
Large Ships with full load displacements between 10,001 and 40,000 tons: M = full speed in knots
Ships with full load displacements between 4,001 and 10,000 tons: M = 150% of full speed in knots
Small ships and boats with displacements less than 4,000 tons:
IF speed is 15 knots or above, M = 200% of full speed in knots
IF speed is 14 knots or less, M = full speed in knots

Submarine Maneuverability:
This is a formula where speed is in knots, depth is in hundreds of feet, and displacement is in thousands of tons rounded up. Full speeds (surfaced and submerged) should be to the nearest tenth of a knot if known. Depth should be divided by 100 feet and expressed to the nearest tenth of 100 feet. (Thus 330 feet = 3.3). Displacements should be in thousands of tons, rounded up to the next highest whole number. [Thus 670 tons = 1, 1230 tons = 2, 2425 tons = 3, etc.]

Constant times (Surface Speed + Submerged Speed + Depth) / Displacement

The constant is 2.
Note that the database lists maximum surface speed and cruising surface speed. The modder must look up the maximum submerged speed for use by the formula.

[Evoken]

I like the surface ship formula , gets pretty close to in game ship values. Thanks for this!