Another high-power-density application I toyed with for a while is a very light-weight (eg carry-on) scooter. Sort of a smaller/simpler/cheaper answer to a Segway.
This one will be a lot lighter when I switch it from AGM to lithium. It rides in my dinghy when I'm anchored out for ground transportation. I'm using an Etek motor at 48 volts, peak amps of 400. So peak HP 25+ continuous 7 3/4 hp.
