proof of concept
http://www.youtube.com/watch?v=rcVb1l87q64
first testrun with two hulls
http://www.youtube.com/watch?v=E4AlTHSRZcI
testrun with stabilizer sword
http://www.youtube.com/watch?v=8BolomnBSsU
how it works
http://www.youtube.com/watch?v=Lo9PLwBOlFY
final build
http://www.youtube.com/watch?v=OlZ1n3thJB8