1. Have you ever flown an avaition aircraft that used a contra-rotating propeller?

2. Do you believe that aircrafts with contra-rotating propellers are safe to fly?

3. Do you believe that aircrafts with these propellers are superior to aircrafts that use standard propellers?

4. How much are you willing to pay for a contra-rotating propeller?

5. Do you think that a contra-rotating propeller is worth getting for a standard avation aircraft?

6. Do you believe that the greatest problem with contra-rotating propellers are their weight?

7. Would you be willing to purchase a contra-rotating propeller if it was lighter and provided greater thrust?

8. If you have any comments/information you would like to add please do so.