Maybe one could argue the case for an old-fashioned manual lockout on thebackup
altimeter? One would have to sim the daylights out of it and put thenext delay
up to be derned sure something like this didn't happen?That is of course if
something didn't plug the static port. If more than one port was drilled, that
wouldn't be likely I'd assume.
The other consideration would be to stick the camera in a shroud on the
sustainer further aft of the ebay to avoid any turbulent disruption.Yeah, miss
the apogee separation but geez, get the cert in the canand then be adventurous.
Kurt
From: Keith Packard <[email protected]>
To: Chris Attebery <[email protected]>; Altus Metrum
<[email protected]>
Sent: Sunday, May 22, 2016 8:09 PM
Subject: Re: [altusmetrum] Flight forensics?
Chris Attebery <[email protected]> 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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