Our students at Bishop-Guertin High School that participated in our High-Altitude Balloon 2 launch this past weekend got together to analyze HAB-2’s flight data. All of our students tracked HAB-2 using APRS.fi and were excited about the HAB’s flight and final altitude of almost 118,000 ft!
We began by reviewing our flight predictions and expectations for atmospheric conditions that we covered in our previous classroom sessions. You can see the materials that the students worked from via the preceding link. Also, the full set of data from HAB-2’s flight computer can be viewed as well.
We began by comparing the predicted flight path with the actual data from the APRS system on HAB-2.
The students concluded that the shape and direction of the predicted and actual paths matched quite well giving us confidence in the path modeling software.
They also noted the HAB-2’s ascent took longer and went much higher than the Balloon Calculator we had used predicted. After some thought, one of the students observed: “maybe we did not put enough helium in the balloon”. This tuned out to be correct. We checked the scale that we used to set HAB-2’s lift with calibrated weights and we found an error in the scale’s calibration that led us to put about 200 g less lift (less Helium) in the balloon than our model required. We also used the same scale to weight the flight platform. These errors would certainly account for the higher altitude and long ascent times that we experienced.
Temperature and Pressure
The students also looked at the pressure and temperature data from the flight. The pressure was about what was expected but the students noticed that HAB-2 had flown through some temperatures as low as -70° F! The discussion turned to the question of why our video cameras had stopped recording at almost exactly the same time – 53 mins into the flight. An examination of our temperature data gave as a probable answer: the temperature took a dip to -50°F about the time that the GoPro video cameras shut off! Their LiPo batteries are only rated to about -40°F. We concluded that we’d need to find a way to keep the camera batteries warm during our next flight.
The students discussed some additional questions and previewed some raw video from the flight and the recovery included a flight path simulation created by Wayne, AG1A.
HAB-2 Open House
We are planning an open house for the students at our QTH to wrap up the project and to preview the final light video. Members of NARS are welcome to join us for the open house. You can find more information about it here.
I especially want to thank all of the NARS members who worked to prepare for and assist the students with HAB-2:
Without our HAB team, HAB-2 and the STEM learning experience that it provided would not have been possible. Thank you all for helping us to create a positive STEM learning experience through Amateur Radio.
We flew our High-Altitude Balloon for the second time this past weekend. Our second High-Altitude Balloon Flight (HAB-2) was part of a STEM learning project that we did with STEM club students at Bishop-Guertin High School in Nashua, NH. The students did all of the flight prep and launched HAB-2 at approximately 11 am ET from a school in Winchester, NH. Parents, teachers and local students joined us for the launch as did several members of our HAB team.
The direction and shape of the path were almost the same as what our model predicted but the flight took longer and went higher than we expected.
We broke our previous altitude record by A LOT! The balloon burst west of Rochester, NH at just short of 118,000 ft! HAB-2’s final altitude was about 400 ft higher than the last APRS burst shown above. This is more the 25,000 ft higher than our last flight!
HAB-2 landed in a pond in Maine. Our floatation system worked well – it kept most of the electronics dry and prevented HAB-2 from sinking.
Fortunately, Jamey, KC1ENX and Curtis, N1CMD had Jamey’s kayak and were able to retrieve HAB-2. The equipment was wet but appears to be in good working condition. We have all of the telemetry data from HAB-2’s flight.
Due to a glitch at launch, the platform flew on its side for the entire flight and the cameras shut off early due to some unusually cold conditions (-70° F) that HAB-2 encountered during its flight. We did get some video from the first 50 minutes of the flight. More pictures and video to come later.
This is the planned day for our High Altitude Balloon (HAB) Launch with students from Merrimack High School, Bishop Guertin High School and others. The launch time and launch site will be announced at a later date.