Flight test
CSIST started a ramjet test vehicle program in 1994, and this project was later merged with the Hsiung Feng program. Flight testing of a prototype started in 2001. Operational testing and evaluation was started in 2004 and was completed by 2005, on board . The development and flight test program for the Yun Feng long range supersonic cruise missile was hidden within the HF-3's flight test program.