 While on vacation, he went to work for Robertson Aircraft, a Seattle-based small business that specialized in developing and certifying STOL kits for single- and twin-engine Cessna and Piper aircraft.In 1969 Raisbeck left Boeing to work full-time at Robertson Aircraft, where he soon became chairman, CEO, president and chief engineer.At Robertson, Raisbeck participated in the development and construction of the University of Kansas "Redhawk", a modified Cessna 177 Cardinal and the "Advanced Technology Light Twin", a modified Piper PA-34 Seneca, both under contract to NASA.