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**Sonda** is a family of Brazilian-built sounding rockets which serves as an R&D path to the VLS (Portuguese: *Veículo Lançador de Satélites*) orbital rocket.

- The
**Sonda 1**is a two stage rocket (1 x S10-1 + 1 x S-10-2 rocket stages) with a maximum flight altitude of 65 km, a liftoff thrust of 27 kN a total mass of 100 kg, a diameter of 11 cm and a length of 4.5 metres. It was launched 9 times between 1965 and 1966.

- The
**Sonda 2**is a single stage rocket (1 x S-20 rocket stage) with a maximum flight altitude of 180 km, a Liftoff Thrust of 36.00 kN, a total mass of 400 kg, a core Diameter of 0.30 m and a total Length of 5.60 m. It was launched 7 times between 1990 and 1996.

**Sonda 3**is a two stage rocket available in two versions, the Sonda 3 (1 x S30 + 1 x S-20 rocket stages) and the Sonda 3M1 (1 x S30 + 1 x S-23 rocket stages). Both rockets have a maximum flight altitude of 600 km, a liftoff Thrust of 102.00 kN, a diameter of 0.30 m and a length of 8.00 m. However Sonda 3 weighs 1500 kg while Sonda 3 M1 weighs 1400 kg at launch. It was launched 27 times between 1976 and 2002.

**Sonda 4**is a two stage rocket (1 x S30 + 1 x S-43 rocket stages) with a maximum flight altitude of 800 km, a liftoff Thrust of 203.00 kN, a total Mass of 7200 kg, a diameter of 1.01 m and a length of 11.00 m. It was launched 7 times between 1984 and 1990.

- https://web.archive.org/web/20150824115334/http://www.astronautix.com/lvs/sonda1.htm
- https://web.archive.org/web/20150824115404/http://www.astronautix.com/lvs/sonda2.htm
- https://web.archive.org/web/20150824115022/http://www.astronautix.com/lvs/sonda3.htm
- https://web.archive.org/web/20150824115656/http://www.astronautix.com/lvs/sonda4.htm