Patent ID: 6971228

Claim:
A propulsion device comprising: an injection chamber for at least one propellant fluid, said injection chamber disposed upstream from a gas injection nozzle; an inductive coil having at least one loop circumferentially surrounding the injection nozzle to heat the ejected gases by induction; a high frequency electricity generator providing power to said inductive coil with alternating current, said power being transformed into heat in the ejected gas by induction, said heat generating added thrust by gas expansion in a diverging section of said nozzle disposed downstream of said inductive coil, wherein said nozzle comprises a first diverging region upstream of a second region circumferentially surrounded by said inductive coil and where the ejected gases are heated by induction, said second region where the ejected gases are heated by induction being followed downstream by a third diverging region of the nozzle, the first and third diverging regions of said nozzle contributing to the total thrust by expanding the gas in respective parts of said diverging nozzle; wherein said second region represents a streamwise contour discontinuity between said first and third regions.