Pico Balloon NE9JJ-2 was launched on March 2nd 2024 from Grayslake, IL. Pico Balloon NE9JJ-2, makes its 2nd circumnavigation around the world today, after 20 days and 18 hours of flight. Information on this flight, launch pictures, location and 84 hour forward trajectory is updated daily on our Locate and Track page.
This launch was conducted in partnership with Todd McKinney, KN4TPG with the University of Alabama in Huntsville. The tracker designed by Ken Daniel, K9YO, 3 panel 12 cell solar package designed by Jim Janiak, NE9JJ to hold the new tracker and weather sensor by Todd McKinney, KN4TPG completes the tracker package weighing approx. 19.3 grams.
As our tracker transmits, amateur radio stations on the ground receive and report our callsign, altitude and location in 2 transmissions 2 minutes apart, the 3rd transmission sends temperature, humidity and pressure at altitide using the weather sensor designed by Todd McKinney weighing 1.6 grams, seen in more detail below.
Weather Sensor by Todd McKinney, KN4TPG from the University of Alabama in Huntsville
Todd had launched our Pico Balloon KD9UQB also flying as W5KUB-115 with Tom Medlin, from Antarctica on November 23rd 2022 which flew for 100 days and 7 times around the world. Jim Janiak formerly KD9UQB, now NE9JJ designed both solar panels, the Low Sun Angle, High Power solar array used for the Antarctica flight and the one above for our current flight.
We’re excited to be part of Todd’s new project, receiving weather reports at altitude for longer flights. Please click on this link for more information on The Pico Balloon Archive by Todd McKinney
Below is today’s location for Pico Balloon NE9JJ-2 at Grid EL69TA flying at an altitude of 40,387 feet after 20 days and 18 hours of flight.
Pico Balloon NE9JJ-2 making its 2nd circumnavigation on March 23rd 2024 after 20 days and 18 hours of flight.
Below is the 84 hour projected trajectory for Pico Balloon NE9JJ-2, from March 23rd thru March 27th 2024
Waiting for good weather for our upcoming balloon launches for Gordie; KD9TVR, Kelsi; KE9LSI, Cal; KD9WNU, Janet; KD9WVO, and our other members. So many balloons, not so great weather here in Chicago.
Standing from left to right, Ken K9YO, Stewart KB9LM, Gordie KD9TVR, Jim NE9JJ, Cary KD9ITO, Doug KD9TPM, and kneeling, from left to right, Janet KD9WVO and Cal KD9WNU from our Stretchinator session
This past Sunday the group gathered at the home of the industrious (and illustrious) Stewart Spies, KB9LM to do some brainstorming, run some tests, and most importantly to enjoy some delicious grub together. Oh, and gadgets. Always new and fun gadgets!
Stage 1: Behold! The Stretchinator Demo
We started the session with Stewart demonstrating The Stretchinator™, his aptly named and turns out, reliably accurate, invention for stretching balloons.
Stewart KB9LM explaining the inner workings of his invention. The gravitational acceleration sensor is attached to the arm as indicated in this image.
The Stretchinator is an assemblage of custom software, hardware and physical infrastructure all built and devised by Stewart Spies, KB9LM. The frame is primarily constructed with PVC pipe and wood. It acts in part as a frame to keep the balloon stable and largely immobile, but also serves as a mount for the gravitational acceleration sensor. This sensor arm, which allows for pitch rotation, is attached to one of the PVC pipes that stands perpendicular to the ground. Simply put, when the arm is parallel to the ground, the sensor’s gravitational acceleration reading will equal 0.
An Arduino controls the input of the hardware with an aquarium pump, the trusty inflator. As the balloon is filled with air, the sensor arm will slowly rotate upwards. When gravitational acceleration reaches zero, the Arduino will then shut the aquarium pump off and no further inflation can occur.
Left to right: Jim Janiak NE9JJ, Cary Willis KD9ITO, Cal Knowles KD9WNU, Ken Daniel K9YO, Stewart Spies KB9LM, Kelsi Mulley KE9LSI, Gordie Mulley KD9TVR, and Doug Mulley KD9TPM (not pictured Janet Knowles KD9WVO)
Stage 2: OMNOMNOM
With The Stretchinator doing its stretchinating best, we took a break to feast on some yummy subs and sides courtesy of Cary and homemade guac by Stewart. We finished off with a few plates of homemade and store bought cookies that somehow traversed to the end of the table where our younger NIBBBers were sitting. Hmmmmm… anyways, back to stretching!
Stage 1.5: Behold! The Stretchinator Demo… CONTINUES!!
Stewart uses a laser range finder to confirm The Stretchinator’s calculation of the diameter of the balloon, which in this case should be just about 32 inches. The transparent Yokohama balloons are at an advantage over the mylar SAG balloons in this sense, as the LRF can cast a laser from through the Yokohama to check The Stretchinator’s accuracy.
Say whaaaaaaat!? Nice work Stewart! Fortunately we were able to spare a few moments to congratulate Stewart on the success of The Stretchinator.
-4.75 m/s20.01 m/s2Before and after. Note the gravitation acceleration went from -4.75 to 0.01 before the pump shut off. The fully inflated balloon was more spherical, rather than a sphere, like a planet. Note that the sensor arm at the top of the image has raised to be roughly parallel to the ground.
Stage 3: Testing makes Besting
The third item on our agenda, after The Stretchinator Demo and the all-important Eating of Cookies, was to test out sealing mechanisms for the balloons. For this step we used an Impulse Heat Sealer that, while purchased new, resembled a giant office stapler from the 50s. Typically, used to seal polyethylene and polypropylene bags, we had more diabolical plans for it: to try to achieve a secure seal at our balloons’ inflation points.
The SAG balloons and Yokohama valved balloons are self-sealing, meaning that when at full altitude, they will automatically seal themselves. Because we launch the pre-stretched balloons, partially inflated, below full altitude, sealing them before they go up is mission critical to ensure no gas escapes. This is where the heat sealer comes in.
Gordie, practicing with the sealer by making tiny and adorable plastic bags.
Our objective was to test if the sealer could adequately seal the balloons. If the heat sealer is set at too high a temperature, the seal could destroy the material and create a hole. If the sealer is set too low, then a seal cannot be made. We were trying to determine what the goldilocks zone was, and if one was even in existence.
We started off by testing sealing balloon material alone using scraps cut from each type of balloon. The sealer made quick work of both mylar and polyethylene. Then we tried to seal the actual balloon’s valves. The SAG balloons have a problematic paint lining on the interior on the valve, which we determined was unsealable. A few potential solutions were thrown around, such as removing the paint with acetone, aka nail polish remover, or just leaving them unsealed, as Stewart pointed out that those balloons had performed quite well. After filling the balloons and before launch, we had been placing a small piece of either Kapton or 3M Shipping tape over the valve to prevent the gas from leaking. The Yokohama requires a nylon washer at the end of the valve opening held by tape to secure the tracker solar panel package.
Pesky valve
Deflating doesn’t have to be bad
Somewhere during the testing, Ken had to leave so he and Stewart deflated the pre-stretched and ready-for-launch SAG balloon (thank you, The Stretchinator!). Using a Dyson hand vacuum and a weak seal with tubing inserted into the valve, Stewart literally vacuumed the air out of the balloon so it could be safely transported to Ken’s home. The process had a watching-the-paint-dry quality.
We all wish this was how long it actually took to deflate.
Wrapping up
With a few minutes left before everyone needed to leave, Jim revealed the new solar panel that he is developing. He also unveiled the new weather sensor package developed by Todd McKinney KN4TPG from the University of Alabama in Huntsville https://www.picoballoonarchive.org/home. We’ll post more on the weather sensor in a future post, so Stay Tuned!
Jim Janiak, NE9JJ new solar panel with a green mock-up of Ken Daniel, K9YO tracker (left). Todd McKinney, KN4TPG’s weather sensor package (right).
Cary sent each of us home with new and very attractive rose gold-colored mylar SAG orb balloons for us to practice on so we didn’t have to leave empty-handed.
For more information – please visit us at NIBBB.org!
