http://www.etotheipiplusone.net/?page_id=700
check this out. its a project called razerblade. they nailed it. check it out.
for the testing videos, here :
http://techtv.mit.edu/collections/etotheipiplusone/videos/7616-first-ground-test-of-the-razerblades-
http://techtv.mit.edu/collections/etotheipiplusone/videos/7779-razerblades-short-street-testing-run
http://techtv.mit.edu/collections/etotheipiplusone/videos/8015-razerblades-street-testing-
i'm not sure how they do it since i'm not an engineer myself. maybe you guys can understand. owh and response to you JDMar take a look. maybe you can see about the possibility. the testing speed is quite slow. and it can also be used as a a normal inline skates. it maintains the speed where you have speed up during normal skates. pardon my english. it doesn't really carry a battery at the back or stored in a backpack. it is all inside the skates itself. about the durability, I'm not really sure. it looks quite fragile as it is. maybe it can be made more smaller or fit in the sole of the skates and uses bigger wheels. maybe 10mm for stability. and also speed is not the problem now. we just have to prove that we can make a skates that is motorized and it is not full with wires cause it will cause people to trip.