What Plane Prototype Was Never Given A Chance To Succeed?

We’ve been flying for over a century now, and, while our arms are so very, deeply fatigued, we’re kind of in an aircraft-design rut. Sure, there’s very very good reasons for this involving “science” and “math” and “reality” other killjoy concepts, but there were so many other novel ideas out there. What’s your… » 4/29/15 11:47am 4/29/15 11:47am