August 2014
Beginner to intermediate
520 pages
22h 49m
English

Themis, the simple water rocket from Chapter 11, used featherweight recovery, where a rocket is light enough that it doesn’t need a parachute or streamer. While the rocket wasn’t particularly light, we could get away with featherweight recovery because it was really large for its weight, which increased the rocket’s drag.
As you move forward with water rockets, though, you may want to add an altimeter, a camera, or simply more bottles to get more power and altitude from your rocket. This makes the rocket heavier, making it more likely you will ...
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