path: root/news/2005-08-20.mdwn
authorJamey Sharp <>2007-08-07 16:48:21 (GMT)
committer Jamey Sharp <>2007-08-07 16:48:21 (GMT)
commitd6362d3cf120aab697f50d041400ba9cf60a12c0 (patch) (side-by-side diff)
treec70dededcddf08f3799f73df8e5130224694ee85 /news/2005-08-20.mdwn
parentd99fec7d09fd1f139c818f7b1b000c4dfbba6d65 (diff)
Repair links to the photo gallery at
Diffstat (limited to 'news/2005-08-20.mdwn') (more/less context) (ignore whitespace changes)
1 files changed, 14 insertions, 14 deletions
diff --git a/news/2005-08-20.mdwn b/news/2005-08-20.mdwn
index 9cd270f..18cd3b3 100644
--- a/news/2005-08-20.mdwn
+++ b/news/2005-08-20.mdwn
@@ -1,7 +1,7 @@
[[meta title="2005-08-20 - A spectacular flight of LV2, but with an unhappy ending"]]
- <center><a href=";set_albumName=fred_azinger_08-20-2005&amp;id=fred_lv2_launch_DSC_5343_cropped"> <img alt="245x640-fred_lv2_launch_DSC_5343_cropped.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="245x640-fred_lv2_launch_DSC_5343_cropped.jpg" src=""> </a></center>
## <a name="Summary:"></a> Summary:
@@ -22,7 +22,7 @@ We experienced three failures:
2. The digital video camera on the ground accidentally recorded the amateur TV to a digital memory card instead of to digital video tape. The memory card soon filled and stopped recording before the flight, so the amateur TV broadcast was never recorded.
3. The backup, or "away" ATV system stopped recording for an unknown reason. This meant that we have no real recording of the ATV transmission (again). (We do have the 1st 3 seconds courtesy of a third party who also recorded part of the ATV transmission.)
-For the complete list of pictures taken at the launch, please see the [PSAS gallery album for this launch](
+For the complete list of pictures taken at the launch, please see the [PSAS gallery album for this launch](
@@ -39,7 +39,7 @@ Another huge success for PSAS was the fact that we did a setup, launch, and tear
We set up two pop-up launch control (LC) tents about a mile away from the launch tower. We were that far away because we wanted the receive antennas on the ground to be more than 10 degrees off of the vertical null in the rocket's cylindrical patch antenna pattern. At a simulated apogee of 18,000 ft AGL, a mile gave us about 17 degrees off vertical assuming the rocket was going straight up.
- <center><a href=";id=38_Launch_Control_Flight_Discussion"> <img alt="38_Launch_Control_Flight_Discussion.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="38_Launch_Control_Flight_Discussion.thumb.jpg" src=""> </a></center>
The launch tower (LT) and launch tower computer (LTC) were set up in parallel with LC, which meant that by about 1:00pm on Saturday things were basically ready for launch. The only setup notes we have are:
@@ -48,25 +48,25 @@ The launch tower (LT) and launch tower computer (LTC) were set up in parallel wi
2. We had a remarkably hard time with the signal strength between the LTC and LC. We think this was because the wire parabolic dish antennas (we call them "BBQ grills") didn't work as well over the bumpy terrain (they really should have been higher off the ground) and - perhaps more importantly - they've been really abused over the last few years. We need to replace them with high gain helical antennas (Yagis?) with external covers so we can throw 'em in the back of a pickup and not be worried. When the wireless link finally connected reliably, the LTC BBQ grill was about 10 degrees to the right of where it "should" be pointed as sighted along the pickup arm.
- <center><a href=";id=Photo_2005_0820_130157AA"> <img alt="Photo_2005_0820_130157AA.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="Photo_2005_0820_130157AA.thumb.jpg" src=""> </a></center>
Remarkably, since we were ready to proceed with the launch, we bolted the airframe together, including the prepackaged avionics module, and did a few power up tests according to the [[CurrentCheckList]]: turned on the avionics module, focused the ATV camera lens, and taped it down. Then we slid the aeroshell on and checked the picture again to make sure the ATV prism was on correctly. Brian and Maggie put the nose cone on, slid the motor in, and we were ready to go!
- <center><a href=";id=Photo_2005_0820_115540AA"> <img alt="Photo_2005_0820_115540AA.thumb.jpg" src=""> </a> <a href=";id=Photo_2005_0820_120654AA"> <img alt="Photo_2005_0820_120654AA.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="Photo_2005_0820_115540AA.thumb.jpg" src=""> </a> <a href=""> <img alt="Photo_2005_0820_120654AA.thumb.jpg" src=""> </a></center>
At the launch tower we had a few problems, mostly related to 1) being able to reliably talk to the launch tower, and 2) the polarization of the uplink radio antenna. It turns out that the circularly polarized 2m turnstile antenna that allows us to send emergency 2m commands to the recovery node is horizontally polarized at the horizon. And since the 2m "long wire" antenna on the airframe of the rocket is vertically polarized, the 2m commands never got through. Once the rocket left the ground, we were sure the turnstile antenna would work correctly, but we never realized it would be unusable on the ground. We used the 2m comm radio (which has a vertically polarized J-pole antenna) to arm the rocket on the tower and everything worked as expected).
- <center><a href=";id=20_LV2_Erected_to_Launch_Position"> <img alt="20_LV2_Erected_to_Launch_Position.thumb.jpg" src=""> </a> <a href=";id=15_Keith_and_Sara_Work_on_Launch_Tower_Communications_Note_Mt_s_in_Background"> <img alt="15_Keith_and_Sara_Work_on_Launch_Tower_Communications_Note_Mt_s_in_Background.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="20_LV2_Erected_to_Launch_Position.thumb.jpg" src=""> </a> <a href=""> <img alt="15_Keith_and_Sara_Work_on_Launch_Tower_Communications_Note_Mt_s_in_Background.thumb.jpg" src=""> </a></center>
We were ready for launch, so Holly called in to have the Oregon Rocketry folks activate the 1-hour high-altitude FAA waiver.
- <center><a href=";id=Photo_2005_0820_141641AA"> <img alt="Photo_2005_0820_141641AA.thumb.jpg" src=""> </a> <a href=";id=Photo_2005_0820_141517AA"> <img alt="Photo_2005_0820_141517AA.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="Photo_2005_0820_141641AA.thumb.jpg" src=""> </a> <a href=""> <img alt="Photo_2005_0820_141517AA.thumb.jpg" src=""> </a></center>
At this point we had several instances of human error. First, Jamey forgot to uncomment a line in our `prepare-for-flight` shells script, which made the GPS never give a "sane" value because the FC thought it was supposed to be in Portland, not Brothers. After about 5 minutes waiting for the GPS, we looked into it, fixed the error, and restarted the launch sequence. Not to be outdone, Andrew proudly one-upped Jamey when, with 7 minutes left to go in the hour-long high-altitude window, Andrew tried to type in the "arm rocket" DTMF command over the uplink radio and his fingers instead dialed the "emergency shutdown" command... which, of course, _instantly shutdown the whole frickin' rocket_. **AAARGGGHH**! So we missed the first high-altitude window.
@@ -82,19 +82,19 @@ At 3:45pm the window activated, and we pushed the launch button on the java `lau
The countdown went exactly as expected and LV2 leapt off the launch tower. Nick tracked the rocket with our "TrackMaster 2000" shoulder-mounted receive antenna array.
- <center><a href=";id=Photo_2005_0820_131210AA"> <img alt="Photo_2005_0820_131210AA.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="Photo_2005_0820_131210AA.thumb.jpg" src=""> </a></center>
Everyone else watched the launch, or huddled around the three laptops running `rocketview` or the ATV monitors. Dave got some _amazing_ photographs of the launch:
- <center><a href=";id=206_lv2_liftoff_edited"> <img alt="206_lv2_liftoff_edited.thumb.jpg" src=""> </a> <a href=";id=207_lv2_liftoff_edited"> <img alt="207_lv2_liftoff_edited.thumb.jpg" src=""> </a> <a href=";id=208_lv2_launch_edited"> <img alt="208_lv2_launch_edited.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="206_lv2_liftoff_edited.thumb.jpg" src=""> </a> <a href=""> <img alt="207_lv2_liftoff_edited.thumb.jpg" src=""> </a> <a href=""> <img alt="208_lv2_launch_edited.thumb.jpg" src=""> </a></center>
... as did other folks:
- <center><a href=";id=lv2_launch_zoom"> <img alt="lv2_launch_zoom.thumb.jpg" src=""> </a> <a href=";id=fred_lv2_launch_DSC_5343_cropped"> <img alt="fred_lv2_launch_DSC_5343_cropped.thumb.jpg" src=""> </a> <a href=";id=26_LV2_Blasts_Off_1"> <img alt="26_LV2_Blasts_Off_1.thumb.jpg" src=""> </a> <a href=";id=28_LV2_In_flight_1"> <img alt="28_LV2_In_flight_1.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="lv2_launch_zoom.thumb.jpg" src=""> </a> <a href=""> <img alt="fred_lv2_launch_DSC_5343_cropped.thumb.jpg" src=""> </a> <a href=""> <img alt="26_LV2_Blasts_Off_1.thumb.jpg" src=""> </a> <a href=""> <img alt="28_LV2_In_flight_1.thumb.jpg" src=""> </a></center>
Glenn reported that the ATV video was fantastic - almost no snow and was clear the whole flight.
@@ -106,7 +106,7 @@ We even saw the commands to fire pyrotechnic charges right at apogee.
What happened next is unclear, but for whatever reason, the nose cone did not come off the airframe. This meant that no parachute ever deployed... and thus after apogee, LV2 keeled over and started descending ballistically. We received telemetry all the way to approximately 300 m above the ground, just a fraction of a second before impact, which gave us the GPS coordinates of the impact site. Prior to impact the rocket was still accelerating. The final velocity at impact was more than 560 mph.
- <center><a href=";id=lv2_descent_zoom"> <img alt="lv2_descent_zoom.thumb.jpg" src=""> </a> <a href=""> <img alt="100x75-rv.png" src=""> </a></center>
+ <center><a href=""> <img alt="lv2_descent_zoom.thumb.jpg" src=""> </a> <a href=""> <img alt="100x75-rv.png" src=""> </a></center>
**_Update September 6, 2005: We think the gun powder recovery charge didn't burn completely, which in turn didn't pressurize the recovery module enough to blow off the nose cone. For more details, please see the [[postmortem analysis page|news/2005-09-01]]._**
@@ -118,19 +118,19 @@ Three separate recovery teams trekked out to the last known GPS coordinates... a
We're trying to figure out what exactly happened. Did the pyrotechnic charges fire? We think they did... but then why didn't the nose come off? Was the gunpowder charge bad? Did the nosecone get jammed on the recovery module? We hope we'll know more after a careful analysis of the remains of LV2, which we found about 0.7 mi from the launch tower based on the last GPS coordinates received from the rocket.
- <center><a href=";id=33_LV2_Dug_Into_Ground"> <img alt="33_LV2_Dug_Into_Ground.thumb.jpg" src=""> </a> <a href=";id=dscf1809"> <img alt="dscf1809.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="33_LV2_Dug_Into_Ground.thumb.jpg" src=""> </a> <a href=""> <img alt="dscf1809.thumb.jpg" src=""> </a></center>
We dug up the rocket to discover it was totally, and completely, destroyed. Nothing was left... not a single circuit board was left intact, including the compact flash card we were hoping to recover. We headed back to the launch control tents. It was, frankly, a pretty depressing end to a stunningly successful launch.
- <center><a href=";id=dscf1836"> <img alt="dscf1836.thumb.jpg" src=""> </a> <a href=";id=dscf1855"> <img alt="dscf1855.thumb.jpg" src=""> </a> <a href=";id=dscf1851"> <img alt="dscf1851.thumb.jpg" src=""> </a> <a href=";id=35_LV2_After_Ground_Removal_1"> <img alt="35_LV2_After_Ground_Removal_1.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="dscf1836.thumb.jpg" src=""> </a> <a href=""> <img alt="dscf1855.thumb.jpg" src=""> </a> <a href=""> <img alt="dscf1851.thumb.jpg" src=""> </a> <a href=""> <img alt="35_LV2_After_Ground_Removal_1.thumb.jpg" src=""> </a></center>
We looked over the remains at launch control, and were pleased to see that Baker the Sock Monkey Astronaut had survived -- barely -- the crash. We're sure that if Maggie has her way, he'll be rebuilt stronger, faster, and better for next launch.
- <center><a href=";id=dscf1859"> <img alt="dscf1859.thumb.jpg" src=""> </a></center>
+ <center><a href=""> <img alt="dscf1859.thumb.jpg" src=""> </a></center>
## <a name="Data"></a> Data