Aerosensor Quickstart Guide V1.1
6
Aerosensor calibration
1. Out/back x 2
2. Average cal values
𝐴𝑣𝑔 𝐶𝑎𝑙 =
𝑆𝑢𝑚 𝐿𝑎𝑝 𝐶𝑎𝑙𝑠
𝐿𝑎𝑝 𝑐𝑜𝑢𝑛𝑡
In this example:
0.948 + 1.180 + 0.961 + 0.990
4
= 1.020
3. Post-correct CdA
𝐶𝑑𝐴 𝐶𝑜𝑟. =
𝐶𝑑𝐴
𝐴𝑣𝑔 𝐶𝑎𝑙
In the velodrome you
can do every run.
Outdoor you should
perform periodically.
Unless making large
changes to setup you
do not need to do this to
get correct result
directionally: lower CdA
is always lower CdA
even if cal factor
changes.
4. Calculate new cal
𝑁𝑒𝑤 𝐶𝑎𝑙 = 𝑂𝑙𝑑 𝑐𝑎𝑙 × 𝐴𝑣𝑔 𝐶𝑎𝑙
In our example
Old cal = 1.40
New cal = 1.400x1.020 = 1.428
5. Enter new cal.
The air “sees” you coming towards it due to high pressure build up ahead of you. For this
reason the air at A
erosensor’s location on your bike is slower than freestream. We need to
correct for this.
1.
Perform at least two out/backs or 4 laps of velodrome
.
a.
Be sure to start recording (“Start activity” button on Garmin).
2.
On page 9 of the CIQ app you see a “Cal” value for every valid lap
. Take the
average of all of these values.
3.
Post-correct your CdA
values by dividing them by this value, i.e.
CdA_corrected = CdA_reported / Avg_cal
4.
Calculate new calibration factor
.
AeroCal_New = AeroCal_Old * Cal
5.
Enter new “Aero device calibration”
