Chris Attebery <chrisattebery1...@gmail.com> writes: > I made an L3 attempt today but it ended with an early deployment. I had a > Telemetrum V2 and an RRC2+ onboard. I had a video camera with a shroud in > the bay with the electronics. I'm pretty sure that it caused some sort of > barametric disturbance and caused one of the altimeters to deploy its main > charge. I don't really care which one, but I'd like to see if the data > supports this. Can any of you take a look at my flight data file and tell > me what you think?
Whoa. "something" bad happened to the pressure data. At motor burn out, around 11000 feet and 3.5 seconds, the barometric pressure stopped decreasing, even though the rocket was going up at over mach 1. Looks like the RRC2+ got confused by this and eventually deployed a drogue chute at 6.5 seconds in to the flight. 1.5 seconds later, TeleMetrum also fired the drogue charge; presumably the rocket was heading down by that point. Because you were going fast, TeleMetrum was flying on accelerometer, so it wasn't fooled by the weird barometric pressure reading. If I had to bet, I'd say that the static port got completely plugged when the airframe started decelerating. Do you have the raw data from the RRC2+ board to compare? Sorry to hear about your "adventures"; let us know if you discover anything else about the flight. I'm going to use the data you sent to do some testing of our EasyMini flight software to make sure it responds reasonably in this case. It's also a baro-only device, so it may have the same failure mode as the RRC2+ in this case. -- -keith
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