Cheap DIY bike system monitoring CdA (aero drag) and Crr (rolling resistance) coefficients, with an Android app connected to an anemometer, a powermeter, and a speed sensor.
Monday, June 15, 2020
Sunday, June 7, 2020
Elevation profiles
Ok, up to now, it is the best measured elevation (normalized at 0 for start/end of the lap) profile I get for my virtual wind tunnel venue. I rode slowly (18-20 km/h) on the 3420m of the venue and recorded data with the Joule 2.0 computer which had a great resolution (0.1m). The elevation is normalized in order to have H(0)=H(L)=0m.
Update 2020/07/15:
Added data during a ride (30-32 km/h) from the Blue Fly Vario variometer (named here BFV) built on a MS5611 barometer inside (providing same 0.1m resolution for elevation). Profiles are very closed, but we can notice that during the ride at higher speed with the BFV, the barometer reported lower altitude at some points (eg: 750-1200m), but not everywhere (eg: 250-500m).
Update 2020/07/15:
Added data during a ride (30-32 km/h) from the Blue Fly Vario variometer (named here BFV) built on a MS5611 barometer inside (providing same 0.1m resolution for elevation). Profiles are very closed, but we can notice that during the ride at higher speed with the BFV, the barometer reported lower altitude at some points (eg: 750-1200m), but not everywhere (eg: 250-500m).
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