This is an airship I designed for the UAVForge competition, it takes advantage of its ability to alter its volume (and thus its density) to take off and land. It is 6 ft long, however folds down into a rucksack.
Some interesting technology I am looking at in terms of software is the Surface From Motion 3D environment estimation
and Active Noise Control
Unfortunately I won't be able to enter into the UAVForge competition as I am travelling while their live video milestone is due, but I thought I would post it here anyway if anyone was interested.