During the late 1920’s and throughout the 1930’s progress progress in rocket design was made in fits and starts with unclear goals.  However, many technological advances in liquid fueled rockets were made.   The United States Germany, Russia, France, Italy, and Great Britain all had rocket research programs.  The most significant advances occurred in Germany, the U.S. and Russia.  But, before we proceed with the history, I want to explain how a liquid fueled rocket works.