Propulsion Systems, Inc. draws on more than 40 years of hard work, customer service, and domestic pride to provide unsurpassed sales and service of American-made controllable pitch propellers and bow thrusters. Headquartered in Seattle, WA, PSI personnel boast more than 25 years experience working with these technical systems. PSI enjoys a loyal worldwide following sold on the company’s customer-first philosophy, expertly trained consultants, can-do attitude, and track record of “making it happen.”