Random Engineering, Physics, ..., Concepts and Ideas

Please post links to interesting, or not so interesting, concepts and ideas here.

Could it help to clarify something about a physical concept? Could it help us to build something? Then post it.

Supreme Skills! Miracle Paper Plane: Part 1 & 2

Supreme Skills! World Record for Paper Plane Flight Distance: Part 1 & 2

Supreme Skills - The Perfect Paper Plane: Part 1 & 2


That’s a great youtube channel! But a bit hard to find something (again) there.

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Cool flow visualization. Nice Boundary Layer explanation. Reynolds Numbers also inform. Flying seeds are natural AWES.

There are parachutes that maximize drag by “ribbon” construction, but solid canopies open faster for safer egress from airplanes, and easier handling after landing. Today’s parafoil parachutes are optimized for lift, to navigate in horizontal dimensions.