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Independently of Lachmann, Handley Page Ltd in Great Britain also developed the slotted wing as a way to postpone the stall by delaying separation of the flow from the upper surface of the wing at high angles of attack, and applied for a patent in 1919; to avoid a patent challenge, they reached an ownership agreement with Lachmann. Handley Page slots on the leading edge of the wing outer panels, plus trailing-edge flaps, made possible a low landing speed. Accommodation was provided for a crew of four. Seven weeks after the first flight, the design was put into produc-tion, and the first examples entered RAF service in the autumn of 1938, 49 Squadron being the first unit. The two-seat Handley Page 'Hendon' became a related development of the single-seat Hanley but this ultimately abandoned aircraft program resulted in just six prototypes completed with a first-flight conducted during 1924. Handley Page British Patent No. 172,109, also relied upon in this connection by the defendant, covered the multi-slotted wing which preceded the invention of the slotted trailing-edge flap. This patent does not claim the same invention as the patent in suit. In the Handley Page type 39 biplane built for the Guggenheim safe aircraft competition, the Handley Page slot is used in addition to give extra lift, not as in the early Handley Page experiments by mechanically-operated slots and flaps, but by automatic slots and flaps extending over the entire top plane.

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  • Handley Page H.P.20

    Experimental monoplane modification of a de Havilland DH.9A, built to study controllable slots and slotted ailerons as high lift devices. The first aircraft to fly with controllable slots.Wikipedia

  • Droop (aeronautics)

    Type of high-lift device found on the wings of some aircraft. Panel that moves away from a wing leading edge when it is deployed.Wikipedia

  • High-lift device

    Component or mechanism on an aircraft's wing that increases the amount of lift produced by the wing. Deployed when required.Wikipedia

  • Alula

    Small projection on the anterior edge of the wing of modern birds and a few non-avian dinosaurs. Latin and means 'winglet'; it is the diminutive of ala, meaning 'wing'.Wikipedia

  • Airco DH.9A

    British single-engined light bomber designed and first used shortly before the end of the First World War. Development of the unsuccessful Airco DH.9 bomber, featuring a strengthened structure and, crucially, replacing the under-powered and unreliable inline 6-cylinder Siddeley Puma engine of the DH.9 with the American V-12 Liberty engine.Wikipedia

  • Fieseler Fi 156

    Small German liaison aircraft built by Fieseler before and during World War II. Production continued in other countries into the 1950s for the private market.Wikipedia

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  • Handley Page

    British aerospace manufacturer. The United Kingdom's first publicly traded aircraft manufacturing company.Wikipedia

  • Boundary layer

    Layer of fluid in the immediate vicinity of a bounding surface where the effects of viscosity are significant. Air layer near the ground affected by diurnal heat, moisture or momentum transfer to or from the surface.Wikipedia

  • Angle of attack

    Angle between a reference line on a body (often the chord line of an airfoil) and the vector representing the relative motion between the body and the fluid through which it is moving. Angle between the body's reference line and the oncoming flow.Wikipedia

  • STOL

    Acronym for a short takeoff and landing aircraft, which have short runway requirements for takeoff and landing. Many STOL-designed aircraft also feature various arrangements for use on runways with harsh conditions (such as high altitude or ice).Wikipedia

  • Stall (fluid dynamics)

    Reduction in the lift coefficient generated by a foil as angle of attack increases. Exceeded.Wikipedia

  • Leading edge

    Part of the wing that first contacts the air; alternatively it is the foremost edge of an airfoil section. Aerodynamic definition, the second a structural one.Wikipedia

  • Airfoil

    Cross-sectional shape of a wing, blade (of a propeller, rotor, or turbine), or sail (as seen in cross-section). Aerodynamic force.Wikipedia

  • Drag (physics)

    Force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers (or surfaces) or a fluid and a solid surface.Wikipedia

  • Aerodynamics

    Study of motion of air, particularly as interaction with a solid object, such as an airplane wing. Sub-field of fluid dynamics and gas dynamics, and many aspects of aerodynamics theory are common to these fields.Wikipedia

  • Flap (aeronautics)

    Aircraft wing at a given airspeed. Flaps are usually mounted on the wing trailing edges of a fixed-wing aircraft.Wikipedia

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Handley Page Victor

  • These wings often use aerodynamic devices like flaps, slots, slats, and vortex generators.STOL-Wikipedia
  • The design was also fitted with Handley-Page wing slots (actually, leading-edge slats).Messerschmitt Bf 110-Wikipedia
  • Other types of foils, both natural and man-made, seen both in air and water, have features that delay or control the onset of lift-induced drag, flow separation, and stall (see Bird flight, Fin, Airfoil, Placoid scale, Tubercle, Vortex generator, Canard (close-coupled), Blown flap, Leading edge slot, Leading edge slats), as well as Wingtip vortices (see Winglet).Foil (fluid mechanics)-Wikipedia
  • 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.Krueger flap-Wikipedia
  • The six Hendons were used for extensive trials to investigate various configurations of leading edge slots/slats.Handley Page Hendon-Wikipedia
  • Originally it consisted of a new set of Pega-STOL wings with retractable leading edge slats to be installed on Zenair CH 701 STOLs to replace their wings which have fixed leading edge slots.Tapanee Pegazair-100-Wikipedia

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An Air Liner Which Set a New Standard of Comfort and Safety During Flight


FAMOUS AIRCRAFT - 1


THE Handley Page 42 type of air liner is one of the most remarkable in the world. Eight of these machines were ordered by Imperial Airways and in June 1931 the first began flying between London and Paris. These machines set a new standard of comfort and safety in air liners, a standard which has been reached by few aeroplanes of later design, though the speeds of the newer machines may be much greater. No fleet of air liners in the world can claim the record held by the Heracles, Horatius, Horsa and others of this fleet, of having flown well over 7,000,000 miles while carrying 300,000 passengers. Not one single paying passenger has been hurt while travelling in these machines.


The Heracles has flown over a million miles. She and her sister craft were built specially to fly on the England to India route. Two varieties were built. Machines of the first variety, known as the Western or Heracles type, were detailed for the section between England and Egypt; the others, known as the Eastern or Hannibal type, were designed for the section between Egypt and India. The main difference between the two types is in the passenger accommodation. The Western type normally carries thirty-eight passengers and a crew of four and the Eastern type sixteen passengers. In the Heracles type the freight compartment has a capacity of 250 cubic feet. For the Hannibal type the figure is 500 cubic feet.


All the machines have four engines, Bristol Jupiters, air-cooled and each developing 550 horse-power. The Heracles type has Jupiter X F.B.M. engines and the Hannibal type Jupiter XI engines.


The wings are of metal construction, covered with fabric. The light aluminium alloy known as duralumin is chiefly used. The wings are fitted with the famous Handley Page slots, which add so much to safety in flying. The body of the machine is of almost circular cross section in shape and is in two parts. The front portion, which is metal-covered, contains the passengers’ saloons, the pilots’ cockpit and the luggage compartment. The rear portion is fabric-covered and carries the tail unit. The biplane tail unit has three rudders of all-metal construction.


The main fuel tanks, holding some 500 gallons, are in the upper wing. The two pilots’ seats are right in the nose of the fuselage, with a small wireless room immediately behind. In the two passengers’ saloons seats are arranged four abreast in the Western type, with a gangway in between. Between the two saloons is the mail and luggage or freight compartment. The saloons have a double skin, which reduces the noise of the engines.


The span of the wings of these machines is 130 feet, the length 89 feet 9 inches and the height 27 feet. When fully loaded they weigh 30,000 lb and carry a payload of 9,000 lb. Both types cruise at 95-105 miles an hour.


The Heracles type has a maximum speed of 127 miles an hour, and a landing speed of 51½ miles an hour. Corresponding figures for the Hannibal type are 120 and 50 miles an hour. Both types are able to fly and climb with one engine out of action.

During the seven years that the Handley Page 42s have been flying they have created a record as being a fleet of the largest commercial aeroplanes in regular use in any part of the world.
























THE FOUR ENGINES of the HP 42 are arranged so that only a small proportion of the noise they make reaches the passengers in the cabins. The wings are of metal construction and are covered with fabric. The front part of the fuselage in which the cabins are situated is metal-covered; the remainder is fabric-covered. The biplane tail unit has three rudders.



[From Part 26, published 30 August 1938]



You can read more on “Air Mails of the Empire”, “Air Travel to the Continent” and “Civil Flying as a Career” on this website.