31. Based upon designs produced by Power Jets, Rolls-Royce produced more advanced and powerful turbojet engines . 32. Thrust was provided by a pair of 30 kN axial flow Rolls-Royce Avon turbojet engines . 33. It was a standard monowheel J-5 with a small turbojet engine replacing the flat two-stroke. 34. Some are ramjets or even a complete turbojet engine . 35. New WP-13B turbojet engines were adopted as well. 36. After the booster was discarded a turbojet engine ignited and propelled the missile to the target. 37. These were powered by turbojet engines from Power Jets Ltd ., set up by Frank Whittle. 38. Two General Electric J35 turbojet engines were used, sending bleed air up through the rotor hub. 39. One key goal is to develop turbojet engines that are about the size of a shirt button. 40. At airliner flight speeds, the exhaust speed from a turbojet engine is excessively high and wastes energy.
