If I had thought about it, I wouldn't have done the experiment. The literature was full of examples that said you can't do this. Professor Goddard does not know the relation between action and reaction and the need to have something better than a vacuum against which to react. He seems to lack the basic knowledge ladled out daily in high schools. 1921 New York Times editorial about Robert Goddard's revolutionary rocket work.
Airplanes are interesting toys but of no military value.
Marechal Ferdinand Foch, Professor of Strategy, Ecole Superieure de Guerre.