In March 1957, my classmates in high school Ivars Neretnieks (who became a Professor in Chemistry) and Jan Renner (who became an Architect) and I conducted a modest experiment in our Rocket Club. We bought two ordinary fireworks rockets and modified them (removed the pyrotechnics) to improve their performance, to measure how high they would go, and to compare their performance with theory.

Our measurements were imprecise but honest. See the bottom line on the third sheet: "Top altitude".

The following four sheets are probably notes from lectures and exercises given by Åke Hjertstrand at the Swedish Interplanetary Society in the spring of 1957. I offer them as evidence that we were serious, hard-working rocket students in our free time. I was 16 years old.

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