The original mounting for the dorsal UBT machine gun provided an excellent field of fire, but lack of aerodynamic balance prevented the gunner / navigator to use its full range.
22.
The Commander of the Islamic Republic of Iran Air Force, Brigadier-General Ahmad Mighani, said that the Saeqeh is up-to-date in terms of aerodynamic balance and in possessing missile and radar systems.
23.
As aerodynamic balance became more critical, this overtaking method drastically decreased as the cars were unable to follow each other through the fast final corner due to turbulence created by the leading car.
24.
About the only noticeable difference between the F . I's overall appearance and the later production Fokker Dr . I examples was a subtle convex curve on the outlines of the tailplane's otherwise " diagonal " leading edge planform, leading into the aerodynamic balancing surface at the end of each elevator tip.
25.
Aerodynamic balance for control surfaces was by geared tab on the IIIa and b, but on IIId, f, and g the outer flap had a 20 % Frise nose which also countered adverse yaw : out-of-balance aerodynamic loads on the elevators were trimmed by a rubber bungee trimmer with the trim datum set by the pilot.
26.
After the conclusion of the manufacturer's trials in April 1947, one aircraft was returned to the factory for extensive modifications as the 150M . The wing tips were angled downward 35?to reduce the lateral stability, the wing was redesigned to detach from the fuselage, and the aerodynamic balancing of the elevators was reduced from 24 % to 20 %.
