Common buzzard hanging in climbing air current along a slope

�@Common buzzard contrives in various ways so as to keep the lift at low speed gliding. The spread and bent down tail makes the flap effect. The standing out ligament of arm also makes the flap effect. The extended forward wing so as to make balance of the moment makes maximum the angle of attack and the bend. The primaries of separated feathers provide the cascade effect and their bent upward tips may reduce to the induce drag. The leading edge slat effect by the held up alulae and the weak turbulence introduced by fluffy front edge fethers may prevent the boundary layer separation. �@Such a flight is the root of the hangglider.
(Prod. Mar. 2002, scale 1/2, No.2)

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