1. Problem: Better control and balance of the aircraft.

Year:

Solution:

2. Problem: Wings did not get enough lift.

Year:

Solution:

3. Problem: Aircraft needs better balance during flight.

Year:

Solution:

4. Problem: Others taking pictures of their airplane in order to steal their ideas on flight for their own monetary gain.

Year:

1. Problem: Better control and balance of the aircraft.

Year: 1899

Solution: Wing-warping which twisted the wing tips in opposite directions.

2. Problem: Wings did not get enough lift.

Year: 1901

Solution: Build wind tunnel and test a variety of wing shapes and their effect on lift.

3. Problem: Aircraft needs better balance during flight.

Year: 1902

Solution: A movable tail connected to wing-warping wires

4. Problem: Others taking pictures of their airplane in order to steal their ideas on flight for their own monetary gain.

Year: 1909

Solution: Coat the airplane with varnish and apply aluminum powder to it so that it will blend into the background on a photograph.