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In 1998, SMDC commissioned the Hypersonic Interceptor Technology Testbed program
which was designed to fly between Mach 8 and 9 (project 29). This program spawned hardware which deflected
canted carbon-carbon fins into full Mach 9 airflows in under 4.5ms with piezoelectric elements. This
demonstrated that not only were these actuators capable of inducing large moments to counter the Mach 9 flows,
but they are among the world’s fastest (if not the fastest) proportional missile fin actuator ever developed.
Figure 5 shows the HITT test vehicle configuration and different fin deflections corresponding to various types
of maneuvers.