Electric motor for propulsion; Google Glass as UI - headsup for display, motion-sensors for control, voice-command for macros.-- FlyingToaster, Jan 20 2015 [Desert Fox]'s original. Propeller_20Haticopter2006 [FlyingToaster, Jan 20 2015] Propeller Beanie http://en.wikipedia...29#Propeller_beanieClassic Nerd Chic. [FlyingToaster, Jan 20 2015] Google is "continuing to develop" the idea, which has been around for ages.-- FlyingToaster, Jan 20 2015 random, halfbakery