engineers from plymouth have developed a human powered vehicle -lrb- hpv -rrb- .
they hope it will break the women 's arm-powered record in nevada .
bike is made of lightweight aluminium and is steered using the rider 's head .
piloted and powered by paracyclist liz mcternan , it needs to exceed 21.39 mph -lrb- 34.42 km/h -rrb- over 656ft -lrb- 200-metres -rrb- to beat the record .