Designing, Building and Launching a BalloonSat
As members of the Women in Aerospace for Leadership and Development (WIALD) student organization launched their payloads from a weather balloon on a windy Texas morning, they bid farewell to Bevo the Dragon, with high hopes that their miniature satellites would be retrieved and intact after landing.
Working in two teams, WIALD members spent the fall and spring semesters designing and building BalloonSats small, simple packages that carry lightweight experiments to the edge of space. The goal of the project was to design, build and test multiple payloads, then launch them aboard a weather balloon to over 100,000 feet in altitude. Each BalloonSat contained components including a GPS unit, accelerometer, temperature sensor, data logger and camera. The trial project was designed as a test mission and, if successful, could eventually be incorporated into the introductory aerospace engineering course.
The teams arrived at Hillsboro Municipal Airport at daybreak on April 6 and began to prepare for launch in the large hangar. They laid out the balloon on a clean surface, inflated it, prepped all of the payloads and created harnesses to hold them, conducted systems checks and performed a final integration. The payloads were tied together as the balloon was inflated. [View a slideshow of their launch preparation.]
Once the group was finally ready to launch, gusts of wind began reaching up to 30 mph. Winds were so strong that it took seven women to hold the 50-pound launch unit to the ground. Launch was further delayed by an airplane dropping skydivers overhead. Then, seconds before final liftoff, Ciara Waldron noticed severe balloon disfiguration and was sure the balloon had popped. Fortunately, it was strong winds causing the disfiguration the balloon had not been damaged.
Finally, after all obstacles were overcome, liftoff became a reality. As the balloon whipped around in the gusty winds, the women ran along with it, holding onto their payloads, until the entire balloon and all attachments were carried away into the sky.
"This project was our most exciting yet," Pinto said. "We created everything that went up procured the balloon, picked the tether line that tied everything together, figured how much helium we needed and more. We designed the entire system ourselves. It was so rewarding."
Immediately after the launch, WIALD members entered chase mode. Using the payload's automatic packet reporting system (APRS), Nicole Pinto and Waldron began tracking the balloon's position, which was being transmitted through a frequency for amateur radio operators. Nearby amateur operators who were listening in also came out to help them track and locate the balloon.
Nearly an hour later, the payloads landed flawlessly, but their location was somewhat difficult to access. The last packet of APRS data was sent from 3,000 feet, so there was quite a stretch of land to search. First, they suspected it had landed in a lake. Fortunately, it had landed safely on a patch of green grass between a lake and a river.
But there was just one problem the payloads landed on private property. With a little coaxing, WIALD members were able to gain access to the property from the owners. Team leaders and project managers finally located the balloon it was laid out so perfectly that when they took photos and sent them to other members, they thought the photo was staged. All of the payloads were in excellent condition.
After completing the mission successfully, WIALD members believe this project is perfect for the aerospace engineering introductory course.
"This is terrific," Waldron said. "Participating in a project like this that has such visual and scientific rewards so early in students' careers will be inspiring. There's no feeling like launching something into space and getting it returned safely."
For more information, photos and video of WIALD's BalloonSat launch, visit http://wiald.ae.utexas.edu/
Our thanks to Millennium Engineering and Integration Company for funding WIALD's balloon satellite project. This is the second year in a row that Millennium has been the primary benefactor for WIALD's hands-on projects. Last year, WIALD launched three IMU payloads to the edge of space aboard a U.S. Air Force rocket.
A version of this story originally appeared on the Department of Aerospace Engineering and Engineering Mechanics website.