The reason why we don't use ion propulsion is because ion propulsion produces a very low thrust and makes it not suitable for quick acceleration or for launching from the surface of a planet.
Ion fusion is only practical for space missions that have a long duration and where the gradual acceleration is only practical over extended periods.
In short ion fusion is good for maneuvering in space but not for rapid launches or even landings.
The fastest propulsion is nuclear fusion rocket propulsion which can reach speeds of millions of miles per hour and is even faster than traditional chemical rockets.
However nuclear fusion rocket propulsion is still under development and not yet in operation.
The fastest speed of ion propulsion is 200,000 miles per hour or 320,000 kilometers per hour as a result of it's high exhaust velocity.
However achieving the speed of 200,000 miles per hour requires a long and also continuous period of operate due to the relatively low thrust which is produced by the ion thrusters.
This makes the ion thrusters ideal for missions such as deep space missions in which a sustained acceleration is needed and is key.
The highest efficiency propulsion are ion thrusters.
Ion thrusters have a significantly higher specific impulse when compared to traditional chemical rockets which makes them ideal for long duration space missions in which high delta- v is required even though it does produce a very low thrust.
Cold gas thrusters are also about the most energy efficient propulsion system as well.
The two main classes of propulsion systems are solid rocket engines and liquid rocket engines.
Solid rocket engines have the fuel and oxidizer mixed together in a solid propellant that burns completely once it's ignited.
And liquid rocket engines use separate tanks for storing liquid fuel and the oxidizer, which are then pumped into a combustion chamber in order to create the needed thrust.
The difference between propel and propulsion is propel is to push or drive forward something.
Propulsion is the act or the process of driving or pushing something forward.
Propel is the action of creating propulsion and propulsion is the state of being propelled.
Basically propel is to cause to move or sustain a motion and propulsion is the process of driving or propelling an object.
An example of propulsion is a rocket engine that launches a spacecraft into space.
To create propulsion the burning of fuel creates hot gas which is then expelled through a nozzle to generate the thrust needed to propel the rocket forward.
Any exact which pushes an object or something to move including a car engine driving a vehicle or even a person that is walking by pushing off the ground are also examples of propulsion.
When you drive your car the engine burns fuel which turns makes the engine run and turn the engines crankshaft to engage with the transmission to propel the car forward down the road.
Essentially propulsion is simply the act of driving an object forward or pushing an object forward.
When you pedal a bicycle you're propelling the bicycle forward with your feet on the pedals.
A propulsion system also uses a source of power to create thrust.
This thrust then pushes against an object like a car, airplane, rocket etc to move it forward.
The amount of thrust that is created depends on the mass flow through the engine and also the exit velocity of the gas.
Walking, flying and airplane, launching a rocket and driving a car or other vehicle are all examples of propulsion.
There are several types of propulsion systems which include rocket propulsion systems, electric propulsion systems, gas turbine engines and internal combustion engines.