sentence: Black powder is the oldest type of mixed rocket fuel.
sentences_after: It was used in rockets even before it was used in guns. Before that it was only used for fun. The first recorded use of rockets as military weapons was in 1232. The black powder was packed in a closed tube that had a hole in one end for escaping hot gases. The tube was mounted on a long stick so it was more balanced.
concept_name: black powder
headings: Black powder rocket motor History
categories: Rockets Fuel