Patent ID: 6574964
Filing Date: 2003-06-10
Classification: F02K,F05D

Abstract:
A full-flow rocket nozzle with a throat and an exit, said nozzle having a longitudinal contour essentially corresponding to a parabola at said throat, said contour having a variable radius r at any point along a length of said nozzle between said throat and said exit, r being an axial distance to said contour from an imaginary centerline along the length of the nozzle, wherein the contour changes shape from a point of 50% expansion ratio along the length of the nozzle and continuing along said nozzle away from the throat towards the exit, so that the contour (i) becomes strictly conical in shape having an angle with respect to the center line of between 15Â° and 25Â°, (ii) has a slight outward curvature with a positive 2nd derivative of the radius r with respect to said length, or (iii) has a slight inward curvature with a negative 2nd derivative of r with respect to said length, said inward curvature lying externally of the parabola contour and the 3rd derivative of r being constantly equal to zero.