An engine inlet for efficient operation at both design Mach number and off-design Mach numbers has a variable geometry caret inlet having an initial compression ramp and a principal compression ramp extending aft from and rotatably attached to the initial compression ramp at a forward hinge line. The principal compression ramp is rotatable from a low Mach position to a design Mach position. A diffuser ramp is engaged by the principal compression ramp at an interface. The diffuser ramp is rotatably mounted at an aft hinge line to a diffuser. The diffuser ramp is rotatable oppositely to the principal compression ramp to maintain contact at the interface. An actuation mechanism has a forward cam drive assembly configured to rotate the principal compression ramp about the forward hinge line. An aft cam drive assembly is configured to rotate the diffuser ramp about the aft hinge line. A motor assembly has at least one motor to drive the forward cam drive assembly and the aft cam drive assembly.