Internal propulsion is a kind of propulsion, producing propulsive force on certain point and in certain direction inside a vehicle without any relation to the environment. Since there is no movement of propulsive device relative to the point of application of force, internal propulsion violates conservation of energy. Energy consumption is associated only with production of thrust, but not with overcoming of friction and gaining of kinetic energy. It is a perpetuum mobile.
The most known example of internal propulsion is jet propulsion. There is exhaust of gases, but force is still being produced inside a vehicle, and jet propulsion does not need environment to propel a vehicle. Jet propulsion also violates conservation of energy.
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