After the arrival of the first production 707 in 1957 the Dash 80 was adapted into a general experimental aircraft and used by Boeing to test a variety of new technologies and systems.
One of its most important tasks during the late 1950s was to test systems for the new Boeing 727, including the fitting of a fifth engine in the rear fuselage.
Other tests included experiments with different airfoil shapes and a number of high lift devices such as blown flaps, in which compressed air bled from the engines is directed over the flaps to increase lift during takeoff and landing.
After the arrival of the first production 707 in 1957 the Dash 80 was adapted into a general experimental aircraft and used by Boeing to test a variety of new technologies and systems. One of its most important tasks during the late 1950s was to test systems for the new Boeing 727, including the fitting of a fifth engine in the rear fuselage. Other tests included experiments with different airfoil shapes and a number of high lift devices such as blown flaps, in which compressed air bled from the engines is directed over the flaps to increase lift during takeoff and landing.
Boeing 367-80