[Andrés]

Atomic Drives are described to use a fission reactor to generate electromagnetic waves that reflect off the space-time fabric of realspace, creating momentum. They are extremely radioactive, and must be stored in a pod that is kept away from the living and working areas of the rest of the ship.

Implosion Drives and High-Pressure Implosion Reactors emit an intense gravitic field that dimples the space-time continuum of realspace, causing the vessel to move. These engines are extremely high-maintenance drives.

Both of them are also described to be out-dated and not in use anymore.

And what everybody uses now are Hoersch-Kessel Ion Drives that use a power source to generate ions, which are expelled through an exhaust nacelle to create thrust. The fuel is first broken down into nuclear energy and converted to ions. These ions are then expelled from the ship, which causes the ship to move in the direction opposite the thrust. Given that the H-K Ion Drive creates radioactive nuclear energy, any ship that is equipped with one must require towing or the addition of a repulsorlift to travel within a planet's atmosphere. Their use is extremely widespread, and they are low-maintenance drives.
And they Solar Ionization or "Fusion" Reactors to feed them. These reactors are strange because they are described to be fusion reactors that can use any fuel as power source, but are more efficient with heavy metals.
The one that first wrote about them didn't know what fusion means.
It's been corrected later by just saying that the word "fusion" doesn't mean nuclear fusion, but some other kind of reaction such as fusing matter into hypermatter (whatever that means).

I just thought that it would make the mod more consistent if similar devices that work with the same principle were similar.
The problem is that Fission Engines in the B5 mod are not only equivalents of standard Ion Engines in performance but also cheaper in price.

I was thinking about making Atomic Drives 1.5x price and size, Implosion Drives 2x in price and supply usage and HK Ion Drives equivalent of standard Ion Engines and get cheaper at higher levels.