Systems and methods involving monopropellant and hypergolic powered proportional actuators that may be used in applications such as robotics. A blowdown tank (10) delivers fuel to a reaction site, produce gaseous products. Those gaseous products are transported to a pressure reservoir (17) or directly to the actuator (26). The gaseous products are controllably introduced into the actuator to actuate a piston. The piston may be used to power a host of devices including robots.
