... by something lowered on a tether. If you think that's comparable to touching... | Hacker News

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		ynniv on Aug 29, 2014 \| parent \| context \| favorite \| on: Inside Google’s Drone-Delivery Program ... by something lowered on a tether. If you think that's comparable to touching a rotor, you don't know much about rotors. mv^2!

hnriot on Sept 1, 2014 [–]

touching a rotor chops your hand off. Getting hit in the head by delivery of dog food kills you. It's kinetic vs potential energy. for your kinetic energy equation you need a lot of speed and a lot of mass. You can have one of those, but not both.

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