We are the Bristol branch of UKSEDS (UK Students for the Exploration and Development of Space). Here are some projects that we've done.
Like UBSEDS14, the UBSEDS15 balloon was built from 50 micron thick PA-EVOH-PE multilayer film and was 1.5 meters in diameter. The payload weight was 20 grams. We used slightly more helium than for UBSEDS14; combined with about 3 grams of deadweight (including the fill inlet) this resulted in 17.2 grams of free lift. This initial float altitude was 11.4km (37,000 ft).
For 2014/2015 Bristol SEDS produced a model rocket with a scientific payload, to compete with model rockets submitted by other UKSEDS branches as part of the National Rocketry Challenge NRC. Our scientific payload will test different methods for measuring altitude and will also study Doppler shift for a fast moving, vertical object.
The main project of 2013/2014 was to launch a high-altitude balloon into the stratosphere, where it could take photos and video, and to subsequently recover it. The balloon was successfully launched on the 15th June from an airfield near Tewksebury, Cheltenham, and landed near Glastonbury. It reached an altitude of 32 km, and spent about 3 hours in the air.