1 Subjects: “...propulsion...”

2 Subjects: “...propulsion failure...”

3 Subjects: “...propulsion system maintenance...”

4 Subjects: “...hybrid electric propulsion...”

5 Subjects: “...hybrid propulsion...”

6 Subjects: “...propulsion...”

7 Subjects: “...propulsion cooling system...”

8 Subjects: “...distributed propulsion...”

9 Subjects: “...wingtip propulsion...”

10 Subjects: “...all-electric propulsion...”

11 Subjects: “...efficient energy management strategies for hybrid propulsion systems...”

12 Subjects: “...alternative propulsion system...”

13 Subjects: “...magnetic propulsion...”

14 Subjects: “...hybrid-electric propulsion...”

15 Subjects: “...hybrid propulsion...”

16 Subjects: “...propulsion inverter...”

17 Subjects: “...propulsion drive...”

18 Subjects: “...dual-head electromagnetic propulsion device...”

19 Subjects: “...distributed electric propulsion...”

20 Subjects: “...underwater propulsion...”