The radial turbine increases the velocity of the airflow over the wing's upper surface independently of the forward motion of the aircraft, so that the " fan wing " can achieve useful lift at forward speeds lower than the stalling speed for a conventional wing.
42.
The wing also includes leading edge flaps ( not slats ) along the front of the wing outboard of the tanks ( these leading edge flaps reduce the stalling speed by an additional three knots ), while double-slotted trailing edge fin to keep it clear of the jetwash.
43.
However Gulfstream's inability to produce a design that met regulatory requirements ( especially the requirement then in force-since rescinded-that single-engine aircraft have a maximum stalling speed of 61 knots ), combined with insufficient orders, resulted in the program being terminated in 1985.
44.
After 1991, the airworthiness certification requirements in the USA specify the one-engine-inoperative climb requirement as a gradient independent of stalling speed, so there is less opportunity for vortex generators to increase the maximum takeoff weight of multi-engine airplanes whose certification basis is FAR 23 at amendment 23-42 or later.
45.
The stalling speed of 63 mph ( 101 km / h ) was considered high and was blamed for a fatal crash in 1923, so extensions were fitted to the upper wings, increasing the wingspan from 51.33 ft ( 15.65 m ) to 54.33 ft ( 16.56 m ).
46.
Both Air Force formations, over a period of thirteen minutes, were unavoidably but separately exposed for several minutes each to an early warning radar located at stalling speed of the Combat Talon . accelerated to climb to AGL, while the four assault helicopters broke formation and descended to in single file, timed to land forty-five seconds apart.
47.
Installation of vortex generators can usually bring about a slight reduction in stalling speed of an airplane An increase in maximum weight allowed by structural requirements can usually be achieved by specifying a maximum zero fuel weight or, if a maximum zero fuel weight is already specified as one of the airplane's limitations, by specifying a new higher maximum zero fuel weight.
48.
These modifications resulted in a lower stalling speed of 38 kn at a maximum takeoff weight ( MTOW ) of 2, 300 lb compared to a 45 kn stalling speed at a 2, 100 lb MTOW in the original aircraft . The Chipmunk's original de Havilland Gipsy Major engine was retained, but the original metal propeller was replaced with a lighter fine-pitch wooden propeller.
49.
These modifications resulted in a lower stalling speed of 38 kn at a maximum takeoff weight ( MTOW ) of 2, 300 lb compared to a 45 kn stalling speed at a 2, 100 lb MTOW in the original aircraft . The Chipmunk's original de Havilland Gipsy Major engine was retained, but the original metal propeller was replaced with a lighter fine-pitch wooden propeller.
