FULLY WORKING ready to use - 4 tiny single cylin
Two tiny single cylinder hand cranked generators on their own complete with flat batteries - just turn the handle and the batteries will charge, and a third similar engine mounted on a fun 120 mph electric buggy as a demonstration.
Drive the buggy then crank the handle on the back to start the generator to put some energy back in to the batteries as a demonstration.
If the buggy rolls over, automatic waiving arms will flip it back upright - these stop moving after a few seconds.
For those occasions when you find yourself stuck because there has been some damage to your craft, so you weld everything back working, only to find that ALL your batteries are flat, including all of the reserve batteries, because the wiring shorted out in the accident/fire - never be stranded again!
