AIRCRAFT-TRIPLANE Russian patent published in 2001 - IPC

FIELD: aviation; manufacture of aircraft at enhanced economical and fuel efficiency. SUBSTANCE: aircraft - triplane has fuselage, wing, vertical tail and rear and front horizontal fins. Front horizontal fin is articulated around axis directed along span. Front horizontal fin is self-setting at preset angle of attack. Proposed aircraft is balanced according to canard aeroplane configuration for cruising flights; it is stationary stable in conventional configuration. Front horizontal fin may be made with S-shaped profile. It is good practice to provided front horizontal fin with controllable servo-tab. Front horizontal fin may be provided with rotation limiters within flight angles of attack. EFFECT: enhanced aerodynamic efficiency; improved service characteristics; simplified construction. 4 cl, 1 dwg