i'm a masters student at the university of cape town in south africa. we are trying to encourage disadvantaged school pupils in the townships (grade 11 & 12) to become intersted in science and engineering. since we ourselves are involved in aeronautics we are looking for related project ideas where we can spend a day with the kids, teach them some theory and let them build and test something. i've seen plenty of parachuting eggs, but not much else. does anyone have any ideas of perhaps some kind of vehicle they can build where there are adjustable parameters (flaps, centre of gravity, ...). i'd think this sort of thing has been done before by people more ingenious than us. ideally there would be some mathematics involved where they would predict and then test, explaining inaccuracies in their predictions. or something. any input, suggestions, etc would be greatly appreciated. thanks!