Editing Firefoam shell

{{Image wanted|reason=Images of fired AoE and one of stack AoE (1 shell and full stack designated by color) in a style similar to [[:File:Skip shield radius.jpg]]}}
{{Infobox main|resource
| name = Firefoam shell
| image = Shell firefoam a.png
| description = A pressurized shell filled with fire-retardant foam. Can be fired from mortars or installed as a trap. Explodes when damaged.
| type = Crafted Resources
| type2 = Mortar shell
| tech level = Industrial
| path cost = 14
| stack limit = 25
| beauty = 
| flammability = 1.0
| marketvalue = 55
| mass base = 1.25
| hp = 60
| damage type = Extinguish
| damage = 0
| deterioration = 1.5
| velocity = 41
| blastRadius =  5
| skill 1 = Crafting
| skill 1 level = 4
| work to make = 800
| production facility 1 = Machining table
| research = Firefoam
| resource 1 = Steel
| resource 1 amount = 25
| defName = Shell_Firefoam
| thingCategories = MortarShells
| tradeTags = MortarShell
| page verified for version = 1.3.3066
}}
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 [[{{P|Production Facility 1}}]] once the [[Research#{{P|Required Research}}|{{P|Required Research}}]] research project has been completed. They require {{Required Resources}}, {{Ticks|{{P|Work To Make}}}} of work, and a [[{{P|Skill 1}}]] skill of {{P|Skill 1 Level}}. The steel cost is increased to 35 if the [[AI Storytellers#Classic mortars|Classic Mortars]] difficulty option is enabled.

It can also be purchased from [[traders]].

== Usage ==
{{Ingredient List|noCollapse=true}}

== Summary ==
When fired from a mortar, {{lc:{{P|Name}}}}s spreads [[firefoam]] in a {{P|Blast Radius}} tile radius, extinguishing all fires and preventing new ones.

When damaged beyond 70% of its health, it will explode after between {{ticks|30}} and {{ticks|60}}, 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 {{#expr: 9.9+((24*0.4)^0.5) round 2}} tiles at a full stack of 25.

They are also used in the construction of [[IED firefoam  trap]]s.

== Analysis ==
It is supposedly used for firefighting, due to the fire-extinguishing properties of the residual firefoam. It requires manual targeting to use, as colonists manning mortars don't automatically aim at fires.

However, it is somewhat cost-ineffective, as its tiny 5-tile radius isn't enough to cover large-scale fires, and it lacks the precision to be able to be dropped onto small fires accurately. Firing these shells to extinguish fires will quickly eat through your supply of steel. It cannot extinguish fires inside your colony properly as the mortar's blind spot prohibits it from hitting fires close to it.

It does allow colonists incapable of firefighting such as [[Traits#Pyromaniac|Pyromaniacs]] to help with firefighting efforts, however, which can be handy if you need more hands on deck in controlling an out-of-control wildfire.

The radius from an exploding firefoam shell is significantly larger than that of a fired firefoam shell. Depending on the purpose, placing a single shell and causing it to explode may be more efficient than firing it from a mortar. Indeed, as they will be set off by fire, it may be an effective alternative to [[firefoam popper]]s in some circumstances, trading a larger coverage radius for requiring outright damage to automatically set off.

== Gallery ==
<gallery>
Shell firefoam a.png|One firefoam shell
Shell firefoam b.png|Partial stack
Shell firefoam c.png|Full stack
</gallery>

== Version history ==
* [[Version/0.18.1722|0.18.1722]] - Added.
* [[Version/1.3.3066|1.3.3066]] - Steel requirement decreased from 35 -> 25 unless Classic Mortar difficulty option enabled.

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[[Category: Mortar shells]]