Across
- 3. Has 2 main wings stacked one above the other
- 4. Airships are filled with _____ which is not flammable
- 8. Airships were comfortable, used little fuel and ____
- 9. As air is heated in the hot air balloon it ___
- 11. Ended the airship era
- 12. Da Vinci made detailed observations of which animal?
- 14. Allows each blade to flap independently
Down
- 1. John Stringfellow used _________
- 2. First person to make successful. Controlled glider flights
- 5. The experiment the Wright Brothers did to test wing shapes
- 6. provided data about wing shapes and lift
- 7. Leonardo Da Vinci’s early helicopter concept
- 10. Henri Giffard invented the first powered airship which was flown over ______
- 13. Used by the Chinese as signalling devices