8. What kind of plane did Otto Lilienthal build?
9. Why did the Wright brothers not focus on wing design at first?
10. Name two kinds of propulsion systems that people used or came up with for sustained powered flights in the 19th century.
11. Explain what proves that Karl Woelfert’s open-flame ignition system was dangerous.
12. The engine developed by Langley was far superior over the engine the Wright brothers designed. Why did it not matter that the Wright brother’s engine wasn’t as powerful?
13. Which of the three elements of control (pitch, yaw or roll) was the most difficult to achieve? Roll (balancing the wingtips or banking the aircraft).
14. What is the hang-gliding technique?
15. Why did other developers of plane rejected the idea that the pilot would have complete control over the aircraft?
16. What is the following technique called ‘the pilot could induce a twist across the upper and lower wings in either direction, thus increasing the lift on one side and decreasing it on the other’.