AeroPod, PowerPod and Newton

Thanks John, I'm sure I'd read that at some point, but forgotten. The reason this came up is that I did a set of out and back runs over an hour, during which time the temperature dropped by 5 degrees. The CdA in Isaac drifts upwards, by an amount which looks like it offsets the increase in Crr I wou...

I have some questions about Crr in Isaac that I'm hoping someone may be able to help with. 1. Does Isaac assume a constant Crr for an entire ride, or can it vary? 2. If it can vary, does it vary formulaically (e.g. with temperature), or is it solved, as with CdA? 3. Also if it can vary, is there any...