A boundary layer duct allowed continual airflow to pass through the airfoil above the radiator ducting and exit from the trailing edge of the upper split flap.
22.
One AIR-4 was modified as the "'Yakovlev AIR-4MK "'in 1933 to test nearly full-span split flaps.
23.
Bottom wing span of 23 ft ( 7 m ), 10 in also incorporated longer split flaps of 7 ft ( 2 m ), 9 in per side.
24.
The cantilever wing of the "'Nieuport 161 "', as the first prototype was titled, was built in two parts around single split flaps.
25.
Construction was of mixed split flaps extending from the wing root to outboard of the engine nacelles; as on the Mosquito, the rear of the nacelle was part of the flap structure.
26.
The lower split flap was mechanically linked to the central " main " flap, while the upper split flap and forward bath lip position were regulated via a thermostatic valve which automatically positioned the flaps for maximum cooling effectiveness.
27.
The lower split flap was mechanically linked to the central " main " flap, while the upper split flap and forward bath lip position were regulated via a thermostatic valve which automatically positioned the flaps for maximum cooling effectiveness.
28.
Unlike conventional aircraft, truly " tailless " flying wings cannot use a rudder for lateral control as it was absent, so a set of clamshell-like, double split flaps on the trailing edge of the wingtips were used.
29.
The Transportation Safety Board of Canada report assigned probable cause of the wreck to the incorrect installation of the right wing, which caused the flap on that wing to suddenly retract in flight and create a " split flap " condition.
30.
Leading-edge Handley Page slats were fitted outboard, and the inboard trailing edges carried 4 ft 9 in ( 1.45 m ) span split flaps that opened symmetrically above and below the wing to act as dive brakes.
