METHOD OF IMPROVEMENT OF AERODYNAMIC CHARACTERISTICS OF BIPLANE WING Russian patent published in 1996 - IPC

FIELD: aeronautical engineering; flying vehicles. SUBSTANCE: method consists in selection of optimal area and scanning it in accordance with pitch control stick position, as well as angle of incidence of top wing relative to lower wing and to incoming flow at change of angle of attack of flying vehicle. Top wing 6 moving relative to lower wing 5 at change of balanced position of control stick 1 is constantly set at favourable angle of attack relative to vector of incoming flow local velocity. Besides that, top wing 6 forms converging passage with upper surface of lower wing at each position. Flow in converging passage is accelerated and magnetude of velocity gradient increases and flow break-away from lower wing is dragged to large angle of attack. Application of this method provides for increase of maximum magnitude of lifting force coefficient (C_max) and critical angle of attack (α_cr), as well as for extending the range of flight angles of attack due to maintenance of high aerodynamic property. EFFECT: enhanced reliability. 1 dwg