* 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.