<P> Another example of an early multistaged rocket is the Juhwa (走火) of Korean development . It was proposed by medieval Korean engineer, scientist and inventor Choe Museon and developed by the Firearms Bureau (火 㷁 道 監) during the 14th century . The rocket had the length of 15 cm and 13 cm; the diameter was 2.2 cm . It was attached to an arrow 110 cm long; experimental records show that the first results were around 200m in range . There are records that show Korea kept developing this technology until it came to produce the Singijeon, or' magical machine arrows' in the 16th century . The earliest experiments with multistage rockets in Europe were made in 1551 by Austrian Conrad Haas (1509--1576), the arsenal master of the town of Hermannstadt, Transylvania (now Sibiu / Hermannstadt, Romania). This concept was developed independently by at least four individuals: </P> <Ul> <Li> Kazimieras Simonavičius of the Polish--Lithuanian Commonwealth (1600--1651) </Li> <Li> the Russian Konstantin Tsiolkovsky (1857--1935) </Li> <Li> the American Robert Goddard (1882--1945) </Li> <Li> the German Hermann Oberth (1894--1989), born in Hermannstadt, Transylvania </Li> </Ul> <Li> Kazimieras Simonavičius of the Polish--Lithuanian Commonwealth (1600--1651) </Li> <Li> the Russian Konstantin Tsiolkovsky (1857--1935) </Li>

An aerospace engineer is designing a rocket to have three stages