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Tuesday, December 28, 2021

Major release

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Finally, a new version (4.0.0) of the app is available (see Download ). Since last year, a lot of features has been added (see here for all...
5 comments:
Sunday, October 31, 2021

Racing with an aero system

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The legality of using aero sensors when racing is unclear. Nevermind, I recorded data during two training out and backs, and the time trial ...
Monday, April 12, 2021

Two aero sensors

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Monday, April 5, 2021

Air speeds

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Typical air speed distribution when time trialing on my favorite field testing loop. 
Thursday, December 31, 2020

Bluefly vario precision

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Rolling resistance coefficient @5°C (Crr) 0.0075
Wednesday, December 30, 2020

Chain losses

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It seems that the lower the speed, the lower the chain losses. The auto-zero feature of my G3 has a flaw which explains the variations (0-7%...
Monday, December 28, 2020

Live CdA

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Lot of data to monitor today: instantaneous wind, estimated chain loss (30s average) and real time CdA (~60s average, +/-0.005 precision). F...
Sunday, November 8, 2020

News

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 The app is not available anymore for download and support is stopped since November 2020.
Monday, June 15, 2020

BLE sensors supported by CdaCrr

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Sunday, June 7, 2020

Elevation profiles

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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 v...
5 comments:
Friday, October 11, 2019

Barometer precision on CdA estimation

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No comment yet.
Saturday, December 22, 2018

Test of the dynamic calibration of the airspeed device

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Bad and good news from the velodrome test today. I implemented recently in the app, a dynamic procedure for calculating the correction fact...
Sunday, August 12, 2018

Power meter data quality

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Yesterday, for the first direct comparison during a turbo session, I got results, which confirmed my suspicions, between my two current pow...
Tuesday, January 2, 2018

Cheapest Android phone to use CdaCrr bike computer

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The app is currently tested with the following phones: Blackview A7 Samsung J5, S4 mini, S4, S5 Xiaomi Redmi Note 7 Wiko Pulp 4G ...
Sunday, December 3, 2017

Virtual elevations

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Last week results. The anemometer improves CdA accuracy when drafted a lot by cars. Supposed Crr at 0.004 may be too high.
Monday, August 7, 2017

Track model

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According to Google Maps, the 250 meters track has straight of length 74.8 meters and turn radius of 16.0 meters. The measured incline a...
Friday, March 17, 2017

Velodrome session with high wind

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Back to the outdoor velodrome. I wanted to see if the anemometer could improve precision with high wind conditions. The results, after thr...
Saturday, January 21, 2017

CdaCrr app in one picture

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Sunday, January 15, 2017

Outdoor velodrome with an anemometer

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O n an outdoor velodrome (250m length), the rider selected the "Defined lap length" mode in the app and did a first run of 2...
Tuesday, November 22, 2016

Ride with an anemometer

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A  friend is currently testing intensively the  CdaCrr  app with the  Weather Meter  anemometer mounted on the bike. The air speed is now r...
Monday, April 25, 2016

Monitoring apparent CdA during a race

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I raced sunday on a flat course during 2 hours with the CdACrr app on my bike (a criterium with 30 turns). It was the first time I re...
Monday, February 1, 2016

Velodrome test

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Field testing isn't easy.  Lesson one : one turn (250 meters) per lap is enough to compute a CdA value. Adding more turns f...
Friday, January 22, 2016

1.0 Release

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The CdaCrr app has been released this week on the Google Store . For the moment, it has only been tested on Samsung S4/S5 and Sony Xper...