Expanded Fission Engine



An EXpanded Fission Engine or EX Fission Engine is a Fission Engine made less dense in order to reduce weight, but increasing bulk.

It follows the rules for XXL Fusion Engines except applying the 1/3 weight (and the corresponding rounding) to the Fission type rather than to the Fusion type. It occupies 6 slots in each side torso for IS and 4 for Clans. Clans don't use regular Fission engines, but may mount EX Fission Engines.

Much as with Extra-Extralight Fusion Engines, having the engine shielding down to the bare minimum for safe operation, the EX Fission engine produces waste heat even standing still, and doubling the amount of heat for the use of a 'Mech's movement systems.

A significant difference is that the EX Fission Engine only costs 1.25 times as much as the equivalent standard Fission engine of the same rating, while the XXL Fusion engine costs 5 times as much as an XL one.

The minimum weight for Expanded Fission Engines is 1.75 tons (if using fractional accounting), or 2 tons (if not), compared to the 5 tons of regular Fission engines.

An Expanded Fission Engine still requires 5 Heatsinks. These are included in the case of mounting inside a vehicle or equivalent unit, but they still must suffer a 50% weight penalty on the engine's weight.

Expanded Fission Heat Radiation Leakage
The sealing and shielding in Expanded Fission Engines is imperfect, and as such some radtiation leaks in the heat vented. This is usually no problem as long as the heat is properly dissipated, but starts to be dangerous to the crew when overheated. In heat-tracking units, the end of any turn where an EX Fission equipped unit is above zero heat (after dissipating), make a piloting check. If failed, radiation from the heat exhaust leaks inside the unit and deals 1 damage to every crewmember. This dadmage doesn't trigger consciousness checks. If the unit does not track heat, instead, apply this end-of-turn piloting check if the unit was sucessfully hit by at least one heat-inducing attack. Heat-inducing attacks include the regular assaults of Plasma Rifles, Plasma Cannons, any type of Flamer, and any class of hit by an Inferno ammunition.