Thanks for your insightful comments. It’s also nice to hear your perspective on the 1.6-watt magnitude. I admit that it seems to me that 1.6 watts gets lost in the noise of chain lube, jockey wheel bearings and tire rolling resistance. On the other hand, when you put 1.6 watts in terms of time and weight, it certainly seems more…[Read more]
Not quite. The pure moment condition is just one example of how to quantify the strain energy in a deformed body. If you click on the textbook link, you’ll see several other closed-form solutions, including one for torsional loading and another for axial loading. But none of these is very close to a crank under a pedaling load–even…[Read more]
I’m the author of the strain energy section. (We’ve interacted before; I’m on the Weight Weenies forum as youngs_modulus). You’re right that I assumed that all strain energy was lost; I made that assumption because I wanted to find an upper bound for energy absorbed by loading the crank.
However, I did not assume that the strain energy…[Read more]