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Aspect ratio (aeronautics) An ASH 31 glider with very high aspect ratio (AR=33.5) and lift-to-drag ratio (L/D=56) In aeronautics, the aspect ratio of a wing is the ratio of its span to its mean chord. It is equal to the square of the wingspan divided by the wing area. Thus, a long, narrow wing has a high aspect ratio, whereas a short, wide wing ...
It is measured empirically by testing in a wind tunnel or in free flight test. [1] [2] [3] The L/D ratio is affected by both the form drag of the body and by the induced drag associated with creating a lifting force. It depends principally on the lift and drag coefficients, angle of attack to the airflow and the wing aspect ratio.
Chords on a swept-wing. In aeronautics, the chord is an imaginary straight line joining the leading edge and trailing edge of an aerofoil. The chord length is the distance between the trailing edge and the point where the chord intersects the leading edge. [1][2] The point on the leading edge used to define the chord may be the surface point of ...
The Oswald efficiency is defined for the cases where the overall coefficient of drag of the wing or airplane has a constant+quadratic dependence on the aircraft lift coefficient. where. For conventional fixed-wing aircraft with moderate aspect ratio and sweep, Oswald efficiency number with wing flaps retracted is typically between 0.7 and 0.85 ...
Designer. Ernest Schweizer [1] First flight. 16 January 1954 [2] Number built. 700. The Schweizer SGS 1-26 is a United States One-Design, single-seat, mid-wing glider built by Schweizer Aircraft of Elmira, New York. [3] The SGS 1-26 enjoyed a very long production run from its first flight in 1954 until 1979, when production was ended.
A glider's glide ratio varies with airspeed, but there is a maximum value which is frequently quoted. Glide ratio usually varies little with vehicle loading; a heavier vehicle glides faster, but nearly maintains its glide ratio. [21] Glide ratio (or "finesse") is the cotangent of the downward angle, the glide angle (γ). Alternatively it is ...
Germany. Manufacturer. Schleicher. First flight. 23 January 2020. The Schleicher AS 33 is a German glider manufactured by Alexander Schleicher. [1] The prototype had its maiden flight from Huhnrain Airport, Poppenhausen near Frankfurt on 23 January 2020. [2][3][4] The design can be flown in the 18 metre class or in the 15 metre class. [2]
The nose angle is 125–128° depending on VG setting, wing area is 145 sq ft (13.5 m 2) and the aspect ratio is 6.8:1. The glider empty weight is 63 lb (29 kg) and the pilot hook-in weight range is 140 to 220 lb (64 to 100 kg). The glider model was HGMA certified in 2003. [1] [2] [4] U2 160 Large-sized model for heavier pilots.