sentences:  The launch vehicle for the satellites was the Long March 3 with which it was developed in parallel and conjunction as part of Project 331.In order to achieve a geostationary orbit, in addition to the normal three stages of the Long March 3, the STTW required a small solid propellant kicker.As part of the development program two proof of technology demonstrators were launched (Shiyan Tongbu Tongxing Weixing, "Test Geostationary Communications Satellite").