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This explains a lot.

I've always wondered about how insects can survive large falls (e.g. from desks or ceilings) mostly unharmed, yet for humans a fall from a similar height, relatively to the body size, would be certain death.

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Yes -- there's a folk tale about how a bumblebee is an aerodynamic impossibility. What that actually means is if a bumblebee is scaled up to the size of a bird, say, it can't stay aloft because its wing area is only increasing as the square, but its volume and mass as the cube, of the size change.

The same applies to scaling up helicopters. It is much easier to scale up a plane than to scale up a chopper. A nice example of this is the little 3/4/6/hex copters that you see RC models of.

Scaling those up is very hard if not impossible.

https://en.wikipedia.org/wiki/Bumblebee#Misconceptions

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