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Airspeed

Parsed multiplier on a country or a difficulty setting that no gameplay path reads.

This setting has no runtime effect

The engine accepts and loads it, but no gameplay code uses the stored value.

Country air-speed multiplier

Specification — Country air-speed multiplier
Applies to
HouseType
File
rules.ini
Section
[<ObjectType ID>]
Value
floating point
When omitted
1.0
Used by the game
No — loaded but not used

Each country carries its own multiplier in its own section, and a house of that country combines it with the difficulty section’s and with GameSpeedBias once, at the moment it is given its difficulty slot. A campaign game drops the country’s contribution and keeps the other two, which is how Groundspeed= is treated as well.

What does set an aircraft’s speed is traced under the difficulty setting of the same name.

Difficulty air-speed multiplier

Specification — Difficulty air-speed multiplier
Applies to
difficulty settings
File
rules.ini
Section
[<Difficulty ID>]
Value
floating point
When omitted
1The difficulty block is re-read from fixed defaults whenever its section is present, so a later file that carries the section without this key restores 1 rather than keeping the earlier value.
Used by the game
No — loaded but not used

[Easy], [Normal] and [Difficult] each carry their own multiplier, and the one belonging to the slot a house is assigned is folded into an air-speed figure the house keeps, alongside GameSpeedBias and, outside a campaign game, the country’s own multiplier.

An aircraft in flight covers ground at its own type’s Speed= figure scaled by the throttle its flight locomotor is holding it at — a fraction that rises as it sets off and falls away as it closes on its destination — and no house figure is consulted anywhere in that step. The difficulty multiplier that does reach movement is Groundspeed=, and an aircraft in flight is one of the things it does not scale.