CdaCrr - Bike computer with ae4.0.1 - Google Play

Bike computer to ride faster by improving your aerodynamic position and testing gear/equipment. Among other data, it monitors CdA (drag*area) and Crr (rolling resistance) coefficients, during races or dedicated testing sessions. It
requires
BLE or ANT+ power and speed sensors, and an anemometer (option, see below) for improved precision.
Powermeters
successfully tested are:
-
Power2Max
-
Assioma pedals
-
PowerTap hub
(records speed so additional sensor is not needed)
Speed sensors
currently supported are:
-
CycleOps
-
Garmin
(Warning: old Ant+ Garmin model is not working with the app)
-
Wahoo
-
CooSpo

Avoid any magnet less speed sensor, their accuracy is not as good.

Read the help to quickly see how to use the app:
http://cdacrr.blogspot.fr/p/help.html

If you need help, you may post on Slowtwitch forum, on this
thread
.

Current features:
-Compare Crr between different tires on ridden laps at slow speed (<15km/h)
-Compare your CdA between different positions on ridden laps at high speed (>25km/h)
-Configurable field to switch between different fields (altitude, cadence, bike direction,...)
-Model uses air density accuratly computed with weather station data and detected sensors
-One FIT file and several CSV files are stored and can be sent by mail for post analysis
-Hear/record voice message each lap
-Activate cloud storage to list/edit previous runs later
-Plot virtual vs real elevation (barometer needed)
-Measure road vibration with phone accelerometer if available
-Wind forecast on location where you plan to field test
-Enable/disable auto-zero feature of ANT+ powermeter

The app is free, but more features are available with the
premium version
:
Premium features:
It includes other modes (described
here
):
-Defined lap length mode (for velodrome, click once to start the run)
-Time trial mode (needs barometer) to get CdA at the end of the race
-Criterium mode to get apparent CdA lap per lap during a race
-Training mode
And some optional devices:
-Support
Weather Meter
anemometer to record air speed (to get higher precision for CdA numbers during windy days)
-Possible to use
Bluetooth headset
to hear/record voice messages (useful during velodrome testing)

Download the key for the premium version
here

Known bugs/possible issues:
-BLE connection with older phones is sometimes tricky
-Random ANT+ dropouts
...