I am still collecting topic ideas from the prior post, but several people asked how to get started in rocketry, and what is legal in the local neighborhood. Well, if there is no fire involved, it is probably OK, and so the air, water and baking soda+vinegar rockets are probably fine in just about any town. The later category makes for some sour showers though:
This thing really pops up fast since it quickly evacuates all of its fuel (>95% of its weight). With a regular camera, the human reflex is not fast enough to capture the rocket in frame (there is no signal before it pops). So I set up the camera with a 16mm wide angle lens and used the motor drive to fire off a stream of 1/8000 sec exposures.
These rockets can easily be found online and they are fun for the young kids. Just be careful not to point the back end at anyone while swinging it into to position. Every one I have tried to launch seems to pop off before I can remove my hand… As seen in my very first rocket video… with my wife chuckling at my folly:
(alternate site if YouTube audio is failing)
Next, we’ll move to fire, because fire is cool.