Propeller Trike Best DIY Projects - MIT Students - Aircraft Tubing - Human-Powered Bike - Video - Popular Mechanics Damon Vander Lind and some fellow MIT students combined aircraft-supply tubing and salvaged bike parts into a recumbent trike. The result is a soothingly quiet, human-powered, 20-mph creation — one of several of our best reader projects of the year (with video). bicyclesdiyrally in Public bookmarkswith environmenthackersmitnerdsprojecttechnology