http://arcdog.com/architects/r....easoncell23/activity
Self Propelled Wheelchair With Power Assist A wheelchair with power assistance is a motorized device that can be attached to a standard wheelchair to aid the user in navigating. It can be used indoors on slopes, on different terrains, as well as over long distances. It can also reduce pain in the upper muscles of the limbs. Studies indicate that PAWs enable wheelers to travel significantly farther overall, and exceed their individual daily averages on more days. This is particularly applicable to those with less base wheelchair