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authorandrew <andrew@web>2009-06-10 05:42:01 (GMT)
committer Portland State Aerospace Society <psas@psas.pdx.edu>2009-06-10 05:42:01 (GMT)
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Lame write up!
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[[!meta title="2009-05-31 - Successful launch of LV2.3 in Brothers, Oregon"]]
-# Success!
+# Success!!
We sucessfully launched Launch Vehicle 2.3 (LV2.3) this weekend in Brothers, Oregon, at the Oregon Rocketry's Brothers Launch Site.
+### Saturday morning drive and afternoon setup
+
+We gathered at Tim's house Saturday morning at 9:00am to pack all of our rocket bits: launch tower, antennas, launch control table, etc. We managed to pack it all into the back of Dave's pickup truck and in Dan's brother Bill's "Toy Hauler" - a larg 5th wheel ATV carrier (thanks Dan! thanks Bill!). It was pretty amazing, actually: it was probably the fastest packing and smallest number of vehicles carrying rocket bits we've ever had since LV0. And, amazingly, we actually left *on time*.
+
+We arrived in Brothers around 5:00pm, and in the last few hours of sunlight, managed to raise the launch tower and set up the antennas.
+
+Saturday evening we stayed up late carefully prepping the avionics module and Dan's helicopter... but we - shockingly- even managed to get some sleep.
+
+This was an "airframe only" launch, but we still managed to cram in a bunch of systems into the rocket:
+
+- An Ozark Aerospace ARTS flight computer (hooked to the nose separation ring and the main chute line cutter
+- a 2m backup system, which used a Alinco DJ-7T 2m radio hooked into a Atmel ATMega168 with a DTMF decode chip (also hooked to the NSR and 2nd line cutter).
+- Keith's Telemetrum flight computer, with GPS (flown as payload only, with it's 900 MHz telemetry sending real-time telemetry and acting as a direction finder).
+- An Olimex LPC2148 development board with SCP1000, MP3, and ADXS pressure sensors and ADXL3xx 2 axis accelerometer.
+
+### Sunday morning prep
+
+Sunday morning we got back to work 9:00am, did a final checkover of the avionics, attached the igniters, buttoned up the rocket, and took it to the launch tower. We were ready to go by about 12:45pm, just in time the 12:30pm - 2:30pm waiver that Jeff of BORG called in for us. Again, surprisingly, we were ready to go, we just had to wait for a cloud break. After waiting about 30 minutes for a largish patch of blue sky, we turned on the avionics system(s), and cleared the pad.
+
+One fun distraction was Dan's electric "T-Rex" helicopter. He strapped our spare camera and 2.4 GHz ATV transmitter to the nose and buzzed launch control and the launch tower. We had high hopes to catch the launch from the helicopter's perspective, but a loss of RC control made the 'copter crash and snap a blade. Next time!
+
+### Sunday afternoon launch.
+
+Ian hit the "launch" button at about 1340 PDT in our Java "LaunchControl" software that he patched for this airframe-only flight, and it counted down and launched the rocket over the WiFi link to the launch tower.
+
[[!img launch_600fps_screenshot.png link="launch_600fps.mov" caption="600fps movie of launch"]]
And here's a [[short real-time video|launch_dk.avi]] of launch.
-At 1340 PDT the button was pressed, at 1343 chutes were open, and shortly after it touched down 200 meters from the launch tower. Telemetry, some great photos, and amazing videos will be posted soon!
+The rocket leaped off the pad on Pete Ekstrom's "N" motor with a eery blue glow. We heard two large reports, which later we figured out was the motor "chuffing" (overpressuring). We all lost track of it as it went above the cloud layer, and we all desperately were hoping the parachute system would work. Keith lost telemetry for a a few seconds, but once he got it back, he was able to announce that we were falling slowly enough that we should be on the drogue. And indeed, about a minute after that, the drogue and rocket were sighted. Finally, the ARTS board fired the line cutters and the main chute came out. To top it all off, the rocket landed only a few hundred feet from the launch tower!
+
+And just in time, too: about an hour after the launch, the winds whipped up and started blowing over tents and people, and it started to drizzle. We packed up in record time, and headed back to Portland.
+
+All in all, a perfect flight!
+
+- Thank you to Jeff and BORG for arranging the waiver.
+- Giant thank yous to Liz, Casey and Alex for helping out so much.
+
+## Launch information
+
+- Estimate elevation of hill by launch tower: 4900 ft MSL
+- Launch control was at: `43 deg 47 min 55.4 sec 120 deg 38 min 54.5 sec @ 4459 ft`
+- Launch tower was at: `43 deg 47.652 min 120 deg 39.0889 min @ 4488 ft` (2m accuracy w/10 satellites)
+- Drogue was 16 paces and main was 34 paces away from LT, and between them was 32. Tim's paces are ~ 6 ft.
+
+## Notes on the launch
+
+- We need straighter fins
+ - better fin clamps? Screw holes so close together may torque fins?
+ - Bar between clamps and fins? Could use shims between clamp and bar.
+- 2m backup system
+ - horizontal polarization of the bird feeder didn't reach the rocket on the rail (again)
+ - Better long wire antenna?
+ - Arm rocket by local HT at pad,
+ - or multiple (diverse) 2m uplink antennas
+ - Goal: verify 2m operation in flight.
+- Avionics issues
+ - Really didn't like lack of feedback from all the differnet systems
+ - Need a post-launch checklist for what to do with the avionics
+- Launch lugs
+ - Decide how to really do it. The bottom lug was seemed silly.
+- Aeroshell
+ - Too hard to deal with: too tight! Tim: Make them looser.
+ - Need to think about sequencing how everything fits together.
+- Things that were great
+ - Dan's brother Bill's toy hauler (thanks Bill! thanks Dan!).
+ - A dirt bike was awesome to have to explore the area and go back and forth from LC to the LT.
+ - The two canopies were enough, as long as we had the inside of the Toy Hauler.
+
+## Next steps:
+
+- Possible August launch
+ - Won't be ready with Avionics
+ - Two months: pretty darn close
+- October BRD launch
+ - Four months away
+ - Initial avionics: APS, 2m, pyro and ATV nodes (keep DVR?)
+ - Bonus: FC, IMU, etc.
+ - Two airframes for two launches?
+
+## Things to bring for next time:
+
+- Yellow caution tape for coax to anntenas.
# Pre-Launch Logistics
@@ -65,12 +143,13 @@ Glenn | car | No | HTs, arrow antenna, 2x SLA batteries, SWR meter, 2m birdfeede
Ian | car | 1 | nothing
"""]]
-People looking fo
-r rides who have not yet found one:
+People looking for rides who have not yet found one:
+
+- None
People not caravaning:
-Pete
+- Pete
[[!table data="""
Who | In What | Other people? | With What
@@ -79,21 +158,12 @@ Bart | car | Keith, Jules, Ian Duffe | -
K | car | Paula, 1-2 others | -
"""]]
-### **People and cars leaving Sunday morning**
-
-People arriving on Sunday:
-
-- Nathan with parents
-- Theo (maybe)
-
-People trying to coordinate rides on Sunday:
-
-- Frank, Jeremy, Daniel
-
### **People showing up independently**
- Jay and Doug (by car)
- Steve and Louise (by plane, rendezvousing with Glenn)
- Morgan and Margaret and friends
+- Nathan with parents
+- Theo
[[!tag general event announcement]]