"The Recognized Leader in High Performance Technology"
Aerodynamic Speed Stacks
Aerodynamic Speeds Stacks for the King Air (C90, E90, F90, 100, & A100), Cheyenne (I, II, & IIXL), and the Cessna Conquest I offer an aesthetically pleasing, aerodynamically clean shape that was developed to minimize drag.
American Aviation's analysis showed that the standard pipe shape on these aircraft are aerodynamically
dirty and the pipes are not properly aligned with the airflow. Using modern technology,
American Aviation corrected the problem by developing a low drag exhaust system. The new
stacks were designed to reduce drag and keep the aircraft cleaner. During engineering flight
tests, several possible shapes, cut-off Lengths, and exit profiles were evaluated before completing
American's design. In addition, American tested several positions of the stacks in relation
to the longitudinal axis of the aircraft. This proved to be very important and required that
four distinct stacks be manufactured, as different flange hole locations are required to clock
them to their most aerodynamically correct positions. The results were well worth the effort... Speed Stacks not
only look sleek and fast, they are. As a result of the new shape, airspeeds are increased
from 4 to 8 knots and the boundary layer relief is improved, which means more exhaust
residue will be blown clear of the airframe.