marcag wrote:
Are you saying no device can work properly if it's placed in the area below extensions, above top pof wheel, before head tube, behind front of wheel ?Pretty much. If the device is located any place where adjusting the equipment or rider's position necessitates recalibration, then the device will have limited utility. I very much doubt the Notio mount location will work. At any rate the manufacturer needs to demonstrate the utility of their device and the expected error. Not just for this bias, but overall.
An "acceptable" bias error in the airspeed measurement is in the <0.2% range (0.1km/hr at 50km/hr), for a CdA error of ~0.5% (or for instance 10cm^2 out of 2000cm^2). If changes in position or equipment result in a calibration error greater than this, then it's failed IMO.
EDIT: I think I erred regarding the relationship between airspeed errors and CdA errors. It's 2x, not 2.5x.