Who invented Krueger flaps?

Who invented Krueger flaps?

Werner Krüger
Krueger flap/Inventors
One high-lift device employed on the leading edge of aircraft wings is the Krueger Flap. This aerodynamic profile and its corresponding mechanism, is named after the German engineer Werner Krueger who invented it in 1943.

Why are they called Krueger flaps?

The Krueger Flap is a Leading Edge Flap, the actual generic term. The Krueger dude developed the LE flap used on some airliners so his name is attached.

What aircraft have Krueger flaps?

Early generation jet airliners such as the B707 Series utilized Krueger flaps as their sole leading edge high lift devices. Current generation aircraft use either all slats or a combination of slats and Krueger flaps. Examples of the latter configuration include the B747 and the BOEING 737-700.

What is the difference between Krueger flaps and slot?

Operation. While the aerodynamic effect of Krueger flaps may be similar to that of slats or slots (in those cases where there is a gap or slot between the flap trailing edge and wing leading edge), they are deployed differently. Conversely, slats extend forwards from the upper surface of the leading edge.

Who invented high lift devices?

The first slats were developed by Gustav Lachmann in 1918 and simultaneously by Handley-Page who received a patent in 1919. By the 1930s automatic slats had been developed, which opened or closed as needed according to the flight conditions.

What is a leading edge flap?

Leading-edge flaps. A portion of the leading edge of the wing that folds downward to increase the camber of the wing to increase both its lift and its drag. Leading-edge flaps are used both for takeoff and landing. Also called a nose flap.

What is the main difference between Krueger flaps and leading edge slats?

Krueger flaps, or Krüger flaps, are lift enhancement devices that may be fitted to the leading edge of an aircraft wing. Unlike slats or droop flaps, the main wing upper surface and its nose is not changed. Instead, a portion of the lower wing is rotated out in front of the main wing leading edge.

What is the difference between leading edge flaps and slats?

The part on the leading edge is called a slat, while the part on the trailing edge is called a flap. The flaps and slats move along metal tracks built into the wings. Moving the flaps aft (toward the tail) and the slats forward increases the wing area.

Are droops slats?

The droop flap is similar to the leading-edge slat and the Krueger flap, but with the difference that the entire leading edge section rotates downwards, whereas the slat and Krueger flap are panels which move away from the wing leading edge when it is deployed.

Why aircraft wings are slotted?

A leading-edge slot is a fixed aerodynamic feature of the wing of some aircraft to reduce the stall speed and promote good low-speed handling qualities. A leading-edge slot is a spanwise gap in each wing, allowing air to flow from below the wing to its upper surface.

What is a canard style airplane?

A canard is a fuselage mounted, horizontal surface that is located forward of the main wing to provide longitudinal stability and control. Depending upon the installation, it may be a fixed, moveable or variable geometry surface and may or may not incorporate control surfaces.

What is an aileron in aviation?

aileron, movable part of an airplane wing that is controlled by the pilot and permits him to roll the aircraft around its longitudinal axis. Ailerons are thus used primarily to bank the aircraft for turning.

What is a Krueger flap and how does it work?

Krueger flaps, hinged at their foremost position that once deployed actually become their trailing edges, hinge forwards from the under surface of the wing, increasing the wing camber and maximum coefficient of lift. It produces a nose-up pitching moment.

When was the first Krüger flap invented?

Krüger flaps were invented by Werner Krüger in 1943 and evaluated in the wind tunnels in Göttingen, Germany. One of the earliest civil applications was the Boeing 707, whereas the Swiss company FFA claimed the first use of the flap in its FFA P-16 fighter which flew in 1955.

What is the history of the Boeing 757 Krueger flap?

After the Boeing test flight on the B-707 prototype on 15 July 1954, Krueger flaps were first used in production for the Boeing 727 which made its maiden flight on 9 February 1963. Boeing commenced a series of test flights on 17 March 2015 with a modified Boeing 757, incorporating new wing-leading-edge sections and an actively blown vertical tail.

What type of flaps are used on a Boeing 727?

Outboard of the engine, slat flaps are used on the leading edge. The Boeing 727 also used a mix of inboard Krueger flaps and outboard slats, although it had no engine between them. Most early jet airliners, such as the Boeing 707 and Boeing 747, used Krueger flaps only.