November 2017
Intermediate to advanced
295 pages
12h 33m
English
Content preview from Make: High-Power Rockets
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Chapter 7. Altimeters and Dual Deploy with Cable Cutters
Rockets that fly high have a problem. They need to touch down softly, to protect both the rocket and the things it might land on. At the same time, a moderate crosswind can easily carry the rocket as far away from the pad as the altitude it reached. That’s fine when it’s a model rocket that goes to 1,000 feet, but not so acceptable when it’s a high-power rocket that soars to 15,000 feet—about 3 miles!
This chapter shows the first way to solve the problem. The rocket pops the parachute at apogee, but the parachute is secured with a zip tie. The rocket falls quickly to about 500–1,000 feet, where a barometric pressure sensor fires a cable cutter that cuts the zip tie, allowing the parachute ...
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