Goddard 4 is a series of rockets built by Robert H. Goddard based on their previous rockets, Goddard 1, Goddard 2 and Goddard 3. All used gasoline and liquid oxygen as propellants, injected under pressure in the combustion chamber; they also had remote control. The mass of a rocket to another could vary, given its experimental character.
Four rockets of this model were launched in total, the first on December 30, 1930 and the last on October 27, 1931. Between December 3, 1929 and June 30, 1930, Goddard tested engines for this type of rocket (no launching) at the Camp Devens artillery field, about 40 km from Worcester, with in order to improve the efficiency of the engine, in particular with the use of the nozzle cooling technique by "curtain". Sixteen test benches were built for the tests. In July 1930, operations were moved to Roswell, New Mexico, under the patronage of Daniel Guggenheim, allowing Goddard to devote himself entirely to rocketry. The tests began again on October 23. Specifications (typical values)
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