I’ve been trying (with a lot of help from John at Jolly Logic) to get their altimeter that is designed to be placed in traditional model rockets to work with the Air Rocket launcher found in Make Magazine Volume 15.
The challenge is unlike a traditional rocket that’s under thrust during most of its accent an air rocket expends all of its thrust as it leaves the launch tube. In this article by NASA they describe this as a coasting accent.
The fact that these air rockets have such a small thrust profile makes it very difficult for the altimeter to detect a launch. The video below is the testing that I performed to determine how long it takes for these rockets to exit the launch tube and thus determine how long they are experiencing thrust.
My final conclusion at 60psi the rocket is under thrust for roughly .0498 seconds.
This is purely for fun and I’m not a rocket scientist so if my terminology is off I apologize ahead of time.