Add Argon as a fuel for ion Engine

[Sorabh]

The ion engine uses Xenon as a propellant. What changes do I need to make in the cfg file so that the engine could run on either Xenon or Argon?

Edited May 11, 2018 by Sorabh

[JadeOfMaar]

Near Future Propulsion supples tanks and engines that run on Argon. Before you suggest against installing a whole big mod for it, I suggest it because it sets the bar for ion engines...and depending on how you look at it, it'll save you the trouble of coding the tanks for it. (And you can delete whatever you don't need from its Parts folder.)

In the end, since you want the stock engine to run on Xenon and Argon, you'll also have to study the configs for dual-mode engines like the RAPIER and add these to this engine through MM:

• A new running_xyz {} node inside the EFFECTS {} node.
• A ModuleMultiModeEngine {}
• A second ModuleEnginesFX {} that calls on running_xyz {} for the engine plume.
• EngineID keys for the ModuleMultiModeEngine {} and both ModuleEnginesFX {}.