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I grew tired of the ever-growing body count in the Expanse books - it's kind of depressing if you think about it. But one thing I did enjoy was in one of the bo
by davidw 6y ago
I grew tired of the ever-growing body count in the Expanse books - it's kind of depressing if you think about it. But one thing I did enjoy was in one of the books where some of the protagonists score some bicycles on a devastated Earth to get around.
The bicycle is the most efficient means of human transportation on any kind of reasonably surfaces road or trail.
- acidburnNSA 6y agoUntil the tires pop right?
- exporectomy 6y agoNot the most efficient. Humans have only about 10% efficiency converting food energy to mechanical work. You could burn that food and power a combustion engine to get more work from it. Or burn some other fuel that's easier to get than food, such as wood or, well, oil.
- Drunk_Engineer 6y agoYou failed to take account for the fact that cars are two orders magnitude heavier than bicycles.
- natchy 6y agoNobody mentioned cars. This little 125cc motorcycle get 125-150 mpg. Tops out at 55mph. https://powersports.honda.com/street/minimoto/trail125-abs https://powersports.honda.com/street/minimoto/trail125-abs
- davidw 6y agoA gallon of gas is 31,000 calories according to a quick Google search. I could ride a lot farther with those calories on a bicycle, albeit over more time.
- tedunangst 6y agoWhat if we attach a combustion engine to a bicycle?
- andreareina 6y agoBit higher than that: > The efficiency of human muscle has been measured (in the context of rowing and cycling) at 18% to 26%. https://en.wikipedia.org/wiki/Muscle#Efficiency https://en.wikipedia.org/wiki/Muscle#Efficiency
- gruez 6y agoDoes that include inefficiencies in digestion?
- andreareina 6y agoYup. From the same section: > This low efficiency is the result of about 40% efficiency of generating ATP from food energy, losses in converting energy from ATP into mechanical work inside the muscle, and mechanical losses inside the body
- davidw 6y agoI can ride 100 miles on a big plate of spaghetti. I have yet to see any kind of vehicle that can do that sort of distance on so few calories. Part of the equation is that modern bikes are quite light and do not add a lot to the total weight.
- ArkanExplorer 6y agoIts lucky that a lot of Americans have excess chemical energy stored as fat, just waiting to be converted to mechanical energy with a bicycle.