Engineers form University of Pittsburgh Human Engineering Research Laboratories (HERL) constructed a wheelchair that is powered using a compressed air. The chair is powered by onboard compressed air tanks and there are no batteries or other electronics that might get wet. It weighs about 36 kg and all components can be purchased at any local hardware store. To recharge from any air compressor it takes just 10 minutes, to recharge a conventional battery-powered chair takes several hours. It has a range of only about 4.8 km, or approximately one third that of a battery-powered model.
The university is also looking into licensing the technology for use in locations such as personal care homes, shopping venues, grocery stores or airports. The chair can be seen in use, in the following video.
Source: University of Pittsburgh