2 ms·
Planes also travel 500-600 MPH while birds fly, maybe 30-50 MPH? I don't know what point you are trying to make with that comment. If it was more energy effici
by i_cant_speel 9y ago
Planes also travel 500-600 MPH while birds fly, maybe 30-50 MPH? I don't know what point you are trying to make with that comment. If it was more energy efficient for planes to flap their wings, they would be doing it right now.
- skummetmaelk 9y agoI think you are conflating utility for humans and cost efficiency with energy efficiency. There is no question that birds are more energy efficient than planes in terms of energy expended to move the same mass the same distance. However, humans would prefer to spend large amounts of energy by burning fuel to cross the Atlantic in 6 hours. It is much more COST efficient, but that is because energy is cheap.