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Australian Student Balloon Rises 100,000 Feet, With a Digital Camera
hype7 writes "An Australian student at Deakin University had a fascinating idea for a final project — to send a balloon up 100,000ft (~30,000 metres) into the stratosphere with a digital camera attached. The university was supportive, and the project took shape. Although there were some serious hitches along the way, the project was successful, and he managed to retrieve the balloon — with the pictures. What's really amazing is that the total cost was so low; the most expensive part was buying the helium gas for approximately AUD$250 (~USD$200)."
No, it can't miss Earth from up there. I just did the calculations. At 20 miles up, that adds only 32187 meters to the radius of the Earth. Working through the math, it means that the acceleration due to gravity is 9.7 m/s^2.
At sea level, the acceleration due to gravity is 9.8 m/s^2.
Thus, sea level escape velocity is 11201 meters per second
Escape velocity at 20 miles up is 11152 meters per second.
The difference is 49 meters per second, or 110 MPH.
Now, to pick a gun at random, let's choose the US Army's M198 Howitzer. It's an artillery piece that fires projectiles at approximately 760 meters per second. So you need to have a much bigger cannon, and a much bigger balloon.
Fascism trolls keeping me up every night. When I starts a preachin', he HITS ME WITH HIS REICH!
I estimate 10 million of these balloons have been launched with sensing instruments and radio telemetry. (Twice a day, more than 50 years, 800 sites currently but hundreds since the 1960's= 2x50x365x400 = more than 10 M). There is nothing very interesting about these students doing it.
These camera stories are kind of "eye-candy" science: pleasing to look at but not much substance. There is no trick to launching a balloon with a camera attached... and apart from being outright fun, there isn't any research advancement either into atmospherics or into the engineering technology of launching an instrument package with a balloon. They even do it the easy (safe) way with helium instead of hydrogen. BTW, this is kind of wasteful. Helium is a scarce resource.
The current telemetry packages attached to the weather balloons contain a telemetry transmitter, a GPS receiver, and humidity/temperature sensors. This provides wind speed, direction, altitude, location, temperature, and humidity.
Now, if the students did something interesting such as:
1. Adding in a light weight low-cost stabilizer and remote control package to steady and aim the camera
2. Modify the camera with filters to observe a parameter that is not usually measured (ie: perhaps infrared, uv, etc)
3. Attach a laser and test out a methodology for measuring parameters within a range of the balloon
4. Create a 360 scanning system and analyze the images in real time to provide cloud formation information
5. Created a wireless grid that co-ordinated and measured information from multiple synchronous balloon launces in the same relative area
6. or something else creative, imaginative, and useful
THEN this would be an interesting story. Else just fluff.
If /. publishes another "student loses camera attached to stupid weather balloon" then I'm going to start submitting pictures of our pets. "Man uses $1000 camera to take thousands of pictures of children and dogs".