The INTA-300 was a two-stage Spanish sounding rocket

Sounding rocket

A sounding rocket, sometimes called a research rocket, is an instrument-carrying rocket designed to take measurements and perform scientific experiments during its sub-orbital flight. The origin of the term comes from nautical vocabulary, where to sound is to throw a weighted line from a ship into...

. It consisted of a launch stage from the type Heron and an upper stage of the type Snipe. The INTA-300 was launched six times between 1974 and 1994. The maximum flight height of INTA-300 was 250 km, a takeoff thrust of 138,00 kN, a takeoff weight of 503 kg, a diameter of 0.26 m and a length of 7.27 m.