T HE overarchingmotivation for this work is to provide capability for gun-launched munitions to engage targets that require high maneuverability. Past efforts resulted in precision indirect fire for stationary targets [1,2]. This Note represents a component of a program focused on general development of this enhanced maneuverability for application to relevant systems such as artillery, mortars, and shoulder-launched munitions. The approach to achieve a low-cost gun-hard skid-to-turn maneuver control system outlined in this Note is to leverage commercial-off-the-shelf (COTS) technology for the high-levels-ofacceleration (high-G) environment and develop control algorithms that rely on a high-fidelity characterization of the aerodynamics and flight mechanics. Servomechanisms used by remotecontrolled aircraft hobbyists feature low costs due to high-volume manufacturing; however, components must withstand the high structural loadings during gun launch [3]. A canted fin-stabilized canard-controlled projectile flying in a skid-to-turn configuration was selected. This configuration complicates the aerodynamic characterization due to flow interactions; however, mature computational [4] and experimental [5] methods may be applied. Vortices generated by canard deflections are swept downstream and impact the stabilizing fins, sometimes reversing the fin roll moment [6–8]. Packaging constraints for gun tube launch require deploying stabilizing and control surfaces. The skid-to-turn configuration was chosen for the high bandwidth since the time of flight for some applications of interest may only be 1 s. Classical and modern control techniques have been applied to the roll control problem for missiles [9,10]. The approach herein is to formulate these techniques in the simplest manner possible for the unique projectile environment by including effects like fin cant and canard–fin interactions. The goal of this Note is to develop and demonstrate roll control performance of a low-cost gun-hard skid-to-turn maneuver system. The contribution of this work lies in leveraging COTS devices to reduce cost, ensuring structural integrity, and using high-fidelity flight characterization methods in the control strategy for the gun launch environment. A wide variety of technical disciplines have been successfully synthesized to develop this technology using theory, nonlinear simulation, and experiments.