EOSS 210 NOAA Temperature Profiler


The EOSS210 flight this morning used a new launch technique that was entirely successful on the first try.  We now know that we can launch heavy payloads and subject the flight string components to minimum dynamic stress.

The ascent rate was faster than we had planned and the burst was lower than we had planned.  However, things still turned out OK.  This from Lars,

"To answer the question about weight - our actual weight (according to Sean's homebrewing scale) was 8.8Kg, so we were about 300gr light on our end.   Hopefully this helps explain the fast ascent rate.   However all is well that ends well.  Our fiber finished retracting 3 minutes before burst!"

The ascent rates and burst heights and times are given in the attachments.

The overall experience this morning was so outstanding that we will do it again in two weeks on Aug 01, and then it will be twice as good because we will launch two balloons, EOSS211 for Colorado Space Grant and EOSS212 for NOAA Air Core.  The predicted trajectories will be here,



Original Announcement: 

The launch was moved to the Wiggins Rest Stop, located at the intersection of I-76 (exit 66A) and Federal Highway 34, southwest of Greeley). Our FAA waiver includes this launch site.



Event Date: 
Saturday, July 18, 2015 - 00:00
Flight Coordinator: 
KB0TVJ, Russ
West Intersection of 71 & 14, 30.35


The flight path prediction for this flight is located **here**. Click on the "GIF" link to see the prediction map. This map updates daily starting 10 days before the flight.

**Here** is the revised (7-16-2015) HIBAL notification filed with the FAA in accordance with our **waiver** flights of this type. The HIBAL is filed seven days in advance of the flight and updateed as more information becomes available.

EOSS210 is the third test flight of the NOAA/LASP Optical Fiber Temperature Profiler.  The first flight was EOSS199 in Sept 2014, but the optical fiber broke shortly after launch, so no testing was possible.  The second flight was in March 2015 and was successful.  However, testing time was limited because of the relatively high ascent rate of 1239 ft/min.  See the write-ups of these flights for more information.  The goal of this third flight is to increase testing time by using a relatively slow ascent rate and launching shortly after sunrise of a mid-summer day.

The two previous flights used 3000 gram balloons and gross lift factors of 1.15.  To reduce the ascent rate, this flight will use a gross lift factor of 1.13 which should result in an ascent rate above 800 ft/min. 

The present plan is to launch from Deer Trail, but if wind predictions show that it would be possible to launch from Windsor, the launch will be from there.  The reason for this is that there are minimal obstructions to the east from the Windsor launch site.  That will reduce the chances for a low ascent rate balloon to get caught in light poles that exist around the Deer Trail site.

Balloon Type: 
Totex 3000g latex balloon
10 ft
147.42 MHzK0SCC-11APRS/Cutter

Preflight Net:

  • 147.225 MHz CRA Repeater (107.2 Hz Tone) 8 pm MDT preceding night
  • 146.940 MHz (103.5 HZ Tone) RMRL Repeater if the CRA machine is down
  • 146.640 MHz (100 Hz Tone) DRL will serve as a backup frequency

Recovery Operations:

  • 449.450 MHz RMRL (103.5 Hz Tone)
  • 448.225 MHz (141.3 Hz Tone) Testing… PL verified 7/2/14
  • 446.100 MHz Field Simplex
  • 146.550 MHz Backup field simplex

Launch Site Simplex: 446.050 MHz

HF - Possible ops: 7.235 LSB

Tactical Calls: 
TacticalCall SignNameNotes
AlphaWA0GEH, KC0D, N0KKZMarty, Mark, RickTracking Coordinators, Alpha
BravoW9CN, KB0YRZMike, ChrisTrackers, Alpha Backup
DeltaK0SCC, N0IXStephen, DougTracker, Payload Prep, Launch Team
EchoKE7KCKTomTracker. Launch Team
FoxtrotKC0LJohnTracker, from Texas
GolfKD0SEMDave, RyanTracker
TR Breakfast: 
Hello Trackers! It looks like we will be launching from Wiggins although that has not been confirmed as of Wednesday night. Drive east past Wiggins 2 miles and use exit #66 on I-76, and proceed SE to the rest area. Many will be involved with the launch at Wiggins. Optionally, breakfast can be at McDonald's in Brush about 5:45. This is a change from Ft. Morgan (thanks Chris). Trackers will need to leave Brush at 6:20 to make our way to the recovery site. Wiggins is a new site and has been carefully investigated by Nick and recently by Russ. We will need to be keenly aware of our policies regarding access to private property. All people and vehicles must stay on public roads until permission to enter private land has been acquired by Alpha or one of the tracking team members. Only Alpha will release the teams onto private land. The CSP has been notified of our presence at the rest site and the surrounding area by Larry. Drivers should react accordingly. Lunch will be at the Pepper Pod in Hudson, exit #31 on I-76.