Figure this was better as a separate thread than sticking it in John B's product announcement thread.
I had an experience recently where I was helping a fellow rocketeer prep a very large L3 rocket. He asked me to turn on his altimeters, which I did, but then he thought it would be fun to show me the inside of the AV bay, which was accessed with a door in the airframe.
About a second after he removed the door, the deployment charge fired and ejected the 50-pound nose cone.
We realized after the fact that when he opened the door, the air rushing into the bay caused a change in barometric pressure that fooled the altimeter into firing.
That's the background to this question. In a normal AV bay, the altimeter remains inside the bay, and its only access to the atmosphere is through the static ports. But with the Jolly Logic Chute Release product, the altimeter will start out inside the booster, sampling with a static port, but when the wrapped chute is deployed at apogee via motor ejection, the altimeter comes out with the chute.
Wouldn't this cause the same thing to happen as in the example above? The altimeter suddenly goes from being inside the bay to fully out in the air, subject to the wind.
How does this pressure change not cause the altimeter to deploy early?
Thanks in advance to John Beans, or anyone else who can answer.
I had an experience recently where I was helping a fellow rocketeer prep a very large L3 rocket. He asked me to turn on his altimeters, which I did, but then he thought it would be fun to show me the inside of the AV bay, which was accessed with a door in the airframe.
About a second after he removed the door, the deployment charge fired and ejected the 50-pound nose cone.
We realized after the fact that when he opened the door, the air rushing into the bay caused a change in barometric pressure that fooled the altimeter into firing.
That's the background to this question. In a normal AV bay, the altimeter remains inside the bay, and its only access to the atmosphere is through the static ports. But with the Jolly Logic Chute Release product, the altimeter will start out inside the booster, sampling with a static port, but when the wrapped chute is deployed at apogee via motor ejection, the altimeter comes out with the chute.
Wouldn't this cause the same thing to happen as in the example above? The altimeter suddenly goes from being inside the bay to fully out in the air, subject to the wind.
How does this pressure change not cause the altimeter to deploy early?
Thanks in advance to John Beans, or anyone else who can answer.