Flight 2 RDAS data

The RDAS data gets the usual treatment. Here is a plot straight from the RDAS software showing event times (vertical red lines).

OK, so it might not be there. The stupid file looked OK in Windows but xv just draws a blank. Oh well, on to the mangled data.

I like to process the recorded data with a Kalman filter. This smooths a lot of the noise out and generates an excellant velocity estimate.

Deployment was a bit early at 22 seconds because I somehow didn't reset the timer on the RDAS to 27 seconds after the L flight like I had planned. The purpose of setting this timer is not to backup the deployment at apogee. It is to make sure that the RDAS switches from looking for apogee to looking for the main. Otherwise, depending on deployment configuration, there is a chance that the RDAS will not detect apogee until the rocket is on the ground. This is a concern with all accelerometer based altimeters but at least the RDAS has an option that helps work around it. I shouldn't have tried to set the timer so close to apogee and just used a nice safe value like 30 seconds instead.

Velocity was about 120 feet/second at deployment or about four seconds from apogee. Everything held together but the stress was apparantly too much for the shear pins on the main because at around 50 seconds the main parachutes deployed. This probably resulted in me having to walk less to recover the rocket. It ended up 1.44 miles from the launch pad but within a few hundred feet of a road. If the mains had worked as planned it might have landed a half a mile from a road.

Even though the deployment didn't go quite as planned, I still certified level 3. The NAR doesn't care so much exactly how recovery goes just so long as it is safe. While I am very annoyed that things didn't go as planned, it was still a safe recovery and the rocket suffered no damage and was ready to fly again.

This plot shows just the climb to apogee.

Peak velocity seems to be quite a bit less than Mach 1 so my fastest flight of LDRS was on a smaller rocket (5.5& dia. ATACMS) on a smaller motor. (K695R)