Firefoam shell

Firefoam shell

A pressurized shell filled with fire-retardant foam. Can be fired from mortars or installed as a trap. Explodes when damaged.

Base Stats

Type

Crafted resources – Mortar shell

Tech Level

Industrial

Market Value

55 

Stack Limit

25

Mass

1.25 kg

HP

60

Deterioration Rate

1.5

Flammability

100%

Path Cost

14 (48%)

Ranged Combat

Damage

0 dmg (Extinguish)

Velocity

41 (m/s)

Blast Radius

5

Creation

Crafted At

Required Research

Firefoam

Skill Required

Crafting 4

Work To Make

800 ticks (13.33 secs)

Resources to make

25

Technical

defName

Shell_Firefoam

thingCategories

MortarShells

tradeTags

MortarShell

The firefoam shell is a type of mortar shell that upon exploding, spreads firefoam in a 5-tile radius, extinguishing all fires and preventing new ones.

Acquisition

Firefoam shells can be crafted at a machining table once the firefoam research project has been completed. Each requires  25 Steel, 800 ticks (13.33 secs) of work modified by the general labor speed of the crafter, and a crafting skill of 4. The steel cost is increased to 35 if the Classic Mortars difficulty option is enabled.

It can also be purchased from traders.

Usage

Product	Ingredients	Type [ExpandCollapse]
IED firefoam trap	2	Building - Security

Summary

From smallest to largest, the radius of the shell's AoE when fired, when a single shell cooks off, and when an entire stack cooks off.

When fired from a mortar, firefoam shells spreads firefoam in a 5 tile radius, extinguishing all fires and preventing new ones.

When damaged beyond 70% of its health, it will explode after between 30 ticks (0.5 secs) and 60 ticks (1 sec), spread firefoam in a radius around itself. The radius depends on the quantity in the stack, with a single shell covering a 9.9 tile radius, and expanding this radius proportional to the square root of the stack size times 0.4 up to a maximum radius of 13 tiles at a full stack of 25.

They are also used in the construction of IED firefoam traps.

Analysis

Actually firing a firefoam shell from a mortar is very niche. The tiny, 5-tile radius isn't enough to cover large-scale fires, but mortars lack the precision to drop on small fires accurately. Due to the mortar's blind spot, it cannot extinguish fires inside your colony. For fires outside of your colony, the game will automatically start rain whenever fires get too big - unless a weather controller is forcing fog. Generally, foam turrets or firefoam pop packs are better as mobile fire extinguishers. Even Pyromaniacs can operate either.

Firefoam shells are most useful to create IED firefoam traps. IEDs must be directly lit on fire or triggered by a colonist, but are cheaper to create than a firefoam popper, while having a much larger radius than the firefoam pop pack. In theory, destroying a firefoam shell creates the same firefoam as the IED trap for half the cost. However, the shell must be damaged to set off; while guns cannot damage the shell, gunshots can trigger an IED.

Gallery

• 

  One firefoam shell

• 

  Partial stack

• 

  Full stack

Version history

• 0.18.1722 - Added.
• 1.3.3066 - Steel requirement decreased from 35 -> 25 unless Classic Mortar difficulty option enabled.

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Architect

Security

Barricade • Sandbags • Spike trap

(research)

Autocannon turret • Foam turret • Mini-turret • Rocketswarm launcher • Uranium slug turret • Mortar

IEDs

IED trap • IED incendiary trap • IED EMP trap • IED firefoam trap • IED smoke trap • IED antigrain warhead trap • IED tox trap • IED deadlife trap

Related

Antigrain warhead • EMP shell • Firefoam shell • High-explosive shell • Incendiary shell • Smoke shell • Tox shell • Deadlife shell