Near Future Propulsion

The Near Future Propulsion pack adds many new engine technologies which are generally based off test articles, prototypes and concept electric engines.

Ion Engines
The pack greatly expands upon the supply of low thrust ion engines that are available. They can generally be split into two categories, those fuelled by Xenon Gas and those fuelled by Argon Gas. These engines are relatively simple to operate - just provide the required power and the correct propellant. Some can be extremely efficient.

The PB-ION Electric Propulsion System from stock KSP has been dowrated somewhat; it requires 15 electric charge per second to operate and produces 1 kN of thrust. This is close to its properties in KSP 0.23 and lower.

None of these engines will operate in atmosphere at all.

Plasma Engines
Advanced plasma engines are also available. These tend to have higher thrusts and lower specific impulses than the ion engines, and are fuelled by either Argon Gas or Liquid Hydrogen. They also have higher power requirements, with the most powerful engines requiring up to 1600 electric charge per second to operate at full capacity.

These engines don't work in atmosphere either.

Argon-Fueled

VASIMR Engines
A special, oft-requested case are Variable Specific Impulse Magnetoplasmic Rocket engines. These engines can vary between high thrust, low specific impulse modes and low thrust, high specific impulse modes.

Nuclear Thermal Rocket Engines
Though the pack doesn't provide any new nuclear thermal engines, it does include configuration files to convert the LV-N Atomic Rocket Motor and NTRs from many other common mod packs to use the Liquid Hydrogen resource. Supported mod packs include:
 * NovaPunch
 * Kommitz Nucleonics
 * Lack Luster Labs (Stock Extension)
 * Lack Luster Labs (Full)
 * KSPX
 * RLA Stockalike

Xenon Fuel Tanks
Xenon tanks expand upon the stock offerings by adding new, larger tanks in many versatile form factors.

Argon Fuel Tanks
Argon tanks are added in a full spectrum of sizes, ranging from 0.625m to 2.5m with smaller and larger radial tanks.

Liquid Hydrogen Fuel Tanks
Liquid hydrogen tanks in 1.25m to 3.75m sizes are available. There are even some ridiculously large radial tanks.