Across
- 2. cargo.
- 3. shifts its input and output ratios.
- 5. a type of orbit in which a satellite travels the same speed the earth is
- 6. a system that controls and directs the power of an engine to do work.
- 9. the part of a long-distance truck where the power and operator units are placed.
- 10. a type of power source attached to the stern of a boat.
- 11. transmissions that use valves to change hydraulic pressure so the
- 14. an engine used in most commercial aircraft in use today. It operates at lower
- 15. earth.
- 17. a lighter-than-air nonrigid airship.
- 19. a type of special boat that has a normal hull and a set of underwater wings.
- 21. space fl ights that use rockets to place payloads into orbit.
- 24. a vehicular system that controls the speed and direction of the vehicle.
- 25. than a turbojet engine.
Down
- 1. a vehicular system that produces proper support for the weight of the vehicle
- 4. air vehicles that use either a light gas or hot air to produce lift.
- 7. industry that makes money by transporting people and cargo in airplanes.
- 8. the last layer of space above the earth that blends directly into outer space.
- 12. a space flight that carries human beings into space and returns them safely to
- 13. a large flat plate at the stern of a ship, used to guide the vessel.
- 16. the region above the troposphere.
- 18. cargo-carrying ships.
- 20. the point at which an orbit comes closest to earth.
- 22. rigid airships with metal frames covered with skins of fabric.
- 23. the region lying just above the mesosphere. It is also called the thermosphere.