How does the Powerpod work? Unknown and changing variables
Posted: Fri Nov 04, 2022 4:04 pm
I guess that this is a frequently asked question so I am posting it in this subforum:
"There are lots of things that affect CdA: wheels, bike helmet, ride position, and seat height are just a few." https://velocomp.com/pages/the-tech
As far as I understand the power measurement of all Powerpods (PP) / Aeropods depends on a CdA value that is "entered" during the set-up. I never had a PP so correct me if I'm wrong. I assume that during the initial setup I have to enter how I sit on the bike (endurance vs race position). And based on that the software guesses my CdA. But isn't that much to rough if an estimate? What about the use an aero helmet, deep section wheels, my body shape etc? Also the software would have to assume a value for rolling resistance which can easily vary by 5-10 watts per tire depending on the tire or is the software exact enough and I have to enter the specific tire I ride? Then there is drive train friction which can easily be 5 watts between a waxed chain and a dry one. How is that accounted for?
It seems that the end result is a rather accurate power measurement (I gathered this from reviews) but I'm confused how this is achieved given all the variables (see above) that can vary and have to be taken into account.
"There are lots of things that affect CdA: wheels, bike helmet, ride position, and seat height are just a few." https://velocomp.com/pages/the-tech
As far as I understand the power measurement of all Powerpods (PP) / Aeropods depends on a CdA value that is "entered" during the set-up. I never had a PP so correct me if I'm wrong. I assume that during the initial setup I have to enter how I sit on the bike (endurance vs race position). And based on that the software guesses my CdA. But isn't that much to rough if an estimate? What about the use an aero helmet, deep section wheels, my body shape etc? Also the software would have to assume a value for rolling resistance which can easily vary by 5-10 watts per tire depending on the tire or is the software exact enough and I have to enter the specific tire I ride? Then there is drive train friction which can easily be 5 watts between a waxed chain and a dry one. How is that accounted for?
It seems that the end result is a rather accurate power measurement (I gathered this from reviews) but I'm confused how this is achieved given all the variables (see above) that can vary and have to be taken into account.