With the ever-increasing price of Helium, we have decided to pursue Hyrdogen as a lifting alternative. Because of the added complexities of dealing with the new gas, new fittings, etc, I am moving the launch outside of Hutchinson airport's Class-D airspace.
In addition to the new gas, Danny has constructed a new dual-camera payload for both a side and downward facing camera. The two controllers will fly in separate containers above the camera platform.
A few changes have been made to the ArduinoTrack flight computer, which seem to be resulting in increased reception rates.
Several major issues have been fixed in the Balloon Finder tracking software also.
|Launch Date/Time||Monday, 30 May 2011 at 7:30am|
|Launch Site||Rice Park (38.074654, -97.955453)|
|Primary Transmitter / Antenna||ArduinoTrack controller with Radio Shack HT into a vertically polarized dipole antenna. Signing W0ZC-11.|
|Backup Transmitter / Antenna||Custom PT controller with VX-1R into vertically polarized dipole. Signing AJ0NR-11.|
|Balloon / Gas||Kaymont 600gram / 170 cu feet of Hyrdogen / 10lbs lift.|
|Estimated Burst Altitude||80,000' MSL|
|Estimated Ascent Rate||1200' per minute|
|Estimated Descent Rate||Approx. 1300' per minute at touchdown|
|Capsule(s) weight||Total Flight Weight 5lbs 1oz|
|Balloon Finder Telemetry Mode||PT Mode 2|
Sunday Evening, May 29th - NE track, landing 8 miles E-SE of Salina. Rerunning this with a 1200Z sounding, put us even farther SE, so the earlier the better.
Saturday Evening, May 28th - NE track, landing 14 miles E-SE of Salina. I've adjusted the flight to assume 80k' burst altitude, and 1200fpm ascent to assist in the high-wind launch, as well as to stay south of I-70.
Saturday Morning, May 28th - NE track, landing 8 miles E of Abilene. I also re-ran the prediction at a 1200fpm ascent rate, and it had the expected result of bringing the landing site further in, away from I-70.
Friday, May 27th - NE track, landing a few miles SE of Abilene. Surface winds are looking to be the biggest issue Monday.
Thursday, May 26th - N-NE track, landing a few miles north of Abilene. On this present track, we would probably under-inflate to extend out flight out beyond I-70 farther.
|Launch Date/Time||Monday, 30 May 2011 at 7:45am|
|Launch Site||Crossroads Christian Church (38.1015, -97.939666)|
|Burst Altitude||84,102' MSL|
|Average Rate of Ascent||1295 fpm|
|Terminal Descent Rate||2875 fpm|
|Touchdown Site||4 miles south of Salina (38.73883, -97.607833)|
|Touchdown Date/Time||Monday, 30 May 2011 at 9:26am|
|Recovery Date/Time||Monday, 30 May 2011 at 9:36am|
|Distance Traveled||48 miles as the crow flies.|
|Total Flight Time||1 hour 41 minutes|
|Downloads||W0ZC Logs, KML Mapping File, Launch/Recovery Photos, Aerial Photos|
The weather reports were reporting roughly 22mph sustained, 28mph wind gusts at the time of launch. We packed and prepped all of the payloads first thing, and then filled the balloon with Hydrogen. We over-inflated (intentionally) to provide the maximum amount of lift to clear some obsticles in the high winds. With almost an entire tank of H2 in the 600g balloon, we had 15 pounds of positive lift (+10 pounds net lift).
The balloon took off like a rocket, easily clearning any and all objects in the area. We did not even attempt to use lanyards of any sort - they would have been ripped to shreds.
During the chase, we found a couple more glitches in Balloon Finder, mostly related to Windows 7 compatibility fixes. These caused our real-time predictions to not run, but otherwise, the chase teams continued as usual. That bug has already been found and squashed.