IX-6315 "Dawn" Electric Propulsion System

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IX-6315 "Dawn" Electric Propulsion System
Part image
Ion engine by
Ionic Symphonic Protonic Electronics
Radial size Tiny
Cost (total) 8 000.00 Funds
Mass (total) 0.25 t
Drag 0.2
Max. Temp. 2000 K
Impact Tolerance 7 m/s
Research Ion propulsion.png Ion Propulsion
Unlock cost 16 800 Funds
Since version 0.18
Part configuration ionEngine
Ion engine
Maximum thrust (1 atm) 0.05 kN
(vacuum) 2.00 kN
Isp (1 atm) 100 s
(vacuum) 4200 s
Fuel consumption 0.486 Xenon unit/s

Thrust vectoring × No
Electricity required 367.098 ⚡/s
8.740 ⚡/s
Testing Environments
On the surface × No
In the ocean × No
On the launchpad × No
In the atmosphere × No
Sub orbital ✓ Yes
In an orbit ✓ Yes
On an escape ✓ Yes
Docked × No
Test by staging ✓ Yes
Manually testable ✓ Yes

The PB-ION Electric Propulsion System is a tiny-sized engine which runs on electricity and xenon gas propellant. It's modeled after the real-world Hall effect thruster. Although it is a propulsion system, it can be found in the utility tab of the VAB and SPH.


This engine has a phenomenal fuel efficiency (4200 s Isp), but very low thrust and requires an immense amount of electricity to operate. Xenon gas is provided by xenon containers like the PB-X150 Xenon Container. Electricity can be obtained using solar panels and radioisotope batteries. The amount of electricity needed to keep one ion engine running at full thrust is roughly equivalent to half the output of one Gigantor XL Solar Array, or 12 PB-NUK Radioisotope Thermoelectric Generators.

Batteries can be used to store the electricity since there may be times the solar panels will be blocked from the Sun by objects or the dark side of celestial bodies.

The ion engine is good for fine tuning of orbits. It is also a popular propulsion method for planes on planets on which jet engines don't work. Due to its great fuel efficiency it is also well-suited for interplanetary travel, but maneuvers take a long time to complete due to its low thrust-to-weight ratio - it is advised to use it for very small craft, and to use physics-warp while propelling with it.

It is practically impossible to build an ion-rocket which can defeat gravity on Kerbin, because the engine isn't even strong enough to lift itself against gravity, yet alone itself and its fuel, a battery and a probe core. But when on a low-gravity moon like Minmus or Gilly it is possible to land, start, enter orbit and reach escape velocity with ion-propulsion alone.

Ion-powered "ferries" may also be useful for moving fuel, oxidizer and/or kerbonauts between two larger vessels, by keeping the large craft at such range that only one of them is within draw distance from the "ferry" at any moment, performance loss can be avoided. It is generally more fuel-efficient to move fuel and oxidizer between two ships using a ferry than it would be to dock the larger crafts together using their own engines and RCS.

Because it uses only about 0.485 units of xenon per second, one PB-X50R Xenon Container with 400 units of xenon can supply the engine for almost 14 minutes. The other larger tank PB-X150 Xenon Container with 700 units of xenon has enough to supply the engine more than 24 minutes.

Electrical consumption

The part.cfg lists the electrical consumption as 1.8 E which is the electricity consumed for 0.1 xenon. To propel 1 xenon a electricity of 18 E is required. As seen ingame, the fuel flow is 0.0485 kg/s or 0.4849 xenon/s. The electricity consumption is also higher at 8.7285 E/s.[1] As the Isp given in seconds needs to be multiplied with a slightly higher acceleration (9.82 m/s²) than g0 (= 9.81 m/s²) the actual Isp in m/s is higher and therefore the xenon and electrical consumption is lower.[2]


By emitting ionized xenon gas through a small thruster port, the PB-ION can produce incredibly efficient propulsion, but with a downside of very low thrust and high expense. The general perception of this engine as being powered by "witchcraft" has unfortunately given it a sour reputation.

Ionic Protonic Electronics

By emitting ionized xenon gas through a small thruster port, the PB-ION can produce incredibly efficient propulsion, but with a downside of very low thrust and high energy usage. According to ISP Electronics sales reps, the rumours of this engine being powered by "dark magic" are largely exaggerated.

Ionic Symphonic Protonic Electronics



  • Ionic Protonic Electronics renamed Ionic Symphonic Protonic Electronics, description changed, hrust increased from 0.5 to 2, relative electricity reduced from 12 to 1.8.
  • Initial Release


  1. Answer in the forum to Ion Engine consumes more energy than it should.
  2. In File:10X_Xenon.png 10 PB-Ion engines are running at full power and consuming a lower value that 10× the theoretical value.