With our last balloon drifting through the stratosphere, it is now time for us to look forward to our next project.
The first thing to work on is obviously the quality of our tether rope. Just out of simplicity, I think we have decided to use paracord to hold out next balloon, partly because it is so light, and partly because it can hold so much weight before it brakes. We may also look into the possibility of a second safety line or an anchor that can act as a fail-safe, just in case.
The next thing that we will be changing is the design of the balloon itself. As I mentioned before, a sphere is a very good shape to use on paper, but the problem is it is very hard to produce, making the construction phase take far to long to complete. To try to solve this problem, we decided to change the shape into the cube. A cube is geometrically similar in shape to a sphere but is also much easier to produce. Another way we are going to make the building process easier is by increasing the size of our plastic. We decided to buy some painting drop cloth, which we will use to make the walls of our balloon. this way we only need to fuse two pieces of plastic instead of +50. Because our drop cloth is clear, we are also going to be covering the inside with black paint pigment. It can be bought at Walmart for an only a few dollars and can make our balloon black and so able to absorb the sun’s energy as well, if not better, then the trash bags.
The next modification we wanted to try is one that we have seen on professional balloons but have not tried ourselves yet. That is to put a clear balloon over the black one. This will help us because as the black balloon absorbs the sun’s energy, it will radiate that heat in two directions, in and out. The heat radiated in is already being collected by the black balloon but right now all the energy being radiated out is simply lost energy. By adding a clear balloon outside the black one, we can collect the energy being radiated out as well, increasing the efficiency of our balloon.
The final thing we want to add to our balloon is a black box. Though we do not intend to lose a balloon again, our last outing has taught us that anything can happen. Because of that, we decided to add a sensor package to our balloon so that if we do lose our balloon again, we can find it when it lands. Our box will have several sensors to help know what our balloon is doing at all times.
- A radio tower based tracker. This is similar to what professional weather balloons use, it allows us to track the balloon based on what radio signals are picking it up. We decided to use this tracking device because it is more versatile than a GPS tracker and is also cheaper.
- A camera. One of the main goals of our last balloon was to be able to hold a camera so we can take pictures from 300 feet, just because it would be cool. Because we still want to do this, we are getting a cheap Go-Pro and putting it in our balloon, so that as we fly we can record our flight and hopefully get some good pictures. we chose a Go-Pro because it is smaller and tougher then other cameras and so can survive an impact better. (Even though we hope it never will need to)
- An altimeter. Though we hope to never lose another balloon, we do want to prepare for the possibility. To accommodate that wish, we decided to track our height so if we do lose another balloon and we recover it, we can at least know how high we went.
- A thermometer. Because temperature is so important in calculating our lift, we decided it would be beneficial to add a thermometer to both measures the temperature of the air inside and outside the balloon. This way, we can start to get a better idea of what temperatures we should use in our future calculations.
Because finals are rapidly approaching, both I and Andy agreed that we were too busy to build our next balloon right away. When we do, these are some of the changes we will be making and hopefully, we will get another successful flight. Until then, good luck with your projects and Happy Tinkering!