mm and 1000 mm diameter and carried out combustion tests on lorries and on a special test rig on a Dornier Do 17Z at flight speeds of up to 200 m/s. Later, as petrol became scarce in Germany, tests were carried out with blocks of pressed coal dust as a fuel (see e.g. Lippisch P.13a), which were not successful due to slow combustion.

United States

Stovepipe (flying/flaming/supersonic) was a popular name for the ramjet during the 1950s in trade magazines

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