1 Subjects: “...propeller...”

2 Subjects: “...Propeller thrust...”

3 Subjects: “...propeller optimization...”

4 Subjects: “...controllable pitch propeller...”

5 Subjects: “...propellers...”

6 Subjects: “...wing-propeller aerodynamic interaction...”

7 Subjects: “...propeller wake...”

8 Subjects: “...propeller cup...”

9 Subjects: “...marine propeller...”

10 Subjects: “...propeller...”

11 Subjects: “...tubular propeller turbine...”

12 Subjects: “...propeller...”

13 Subjects: “...chiral propeller structure...”

14 Subjects: “...solid propellants...”

15 Subjects: “..."green" propellants...”

16 Subjects: “...high-energy HTPB propellant...”

17 Subjects: “...marine propeller...”

18 Subjects: “...self-propelled...”

19 Subjects: “...surface-piercing propeller...”

20 Subjects: “...propeller...”