I’m in the midst of trying to hone in on using Aerolab properly. I’ve read the string a few times and studied the PDF doc as well that explains Chung’s Aero testing and VE. I’ll try to keep it short; here’s what I’ve done:
· Testing TT position, standard hold on extensions to find a baseline cda#
· Terrain – outdoor industrial park that has no stop signs and limited to no traffic on weekends
· Winds very light but increase throughout the day
· Used some apps to retrieve data on humidity, temp, Rho, Air density, etc
· Rode 3 loops on a .9mile loop (egg shaped) and started lap 1 at 250W, lap 2 at 270 and lap 3 at 290, essentially 1 shift harder per lap….i wasn’t shooting for specific power targets but they came out close to this
· Garmin 500 capturing data at 1sec intervals and speed sensor is connected and Quarq PM is calibrated prior to each run
Once completed, I uploaded file into GC and looked at the Aerolab. I slide the number bars to reflect the CRR, Mass & Rho…I left CRR at 5, because that seems right and I figured if I compare with the same wheels on the same day with the same tire pressure then that shouldn’t affect the faster v slower…maybe not the most accurate cda # but on a comparison, I’ll find the fastest position…fill me in if this is incorrect.
Now to my real question – when sliding the cda bar, am I supposed to use the constant altitude box checked or unchecked or does it matter?
Also, the 2 charts below show the difference with the box checked and unchecked. I like the straight bar to connect the start and finish points clearer but is this correct? OR is the difference of .0007 so minor that I’m splitting hairs? (i can't seem to upload my images)
Lastly, as a confirmation, am I doing conducting the field testing correctly?
https://drive.google.com/...1ETHc&authuser=0
https://drive.google.com/open?id=0Bybxljl8xw55VVBuVGg1bVNfdXM&authuser=0
Thank you.
· Testing TT position, standard hold on extensions to find a baseline cda#
· Terrain – outdoor industrial park that has no stop signs and limited to no traffic on weekends
· Winds very light but increase throughout the day
· Used some apps to retrieve data on humidity, temp, Rho, Air density, etc
· Rode 3 loops on a .9mile loop (egg shaped) and started lap 1 at 250W, lap 2 at 270 and lap 3 at 290, essentially 1 shift harder per lap….i wasn’t shooting for specific power targets but they came out close to this
· Garmin 500 capturing data at 1sec intervals and speed sensor is connected and Quarq PM is calibrated prior to each run
Once completed, I uploaded file into GC and looked at the Aerolab. I slide the number bars to reflect the CRR, Mass & Rho…I left CRR at 5, because that seems right and I figured if I compare with the same wheels on the same day with the same tire pressure then that shouldn’t affect the faster v slower…maybe not the most accurate cda # but on a comparison, I’ll find the fastest position…fill me in if this is incorrect.
Now to my real question – when sliding the cda bar, am I supposed to use the constant altitude box checked or unchecked or does it matter?
Also, the 2 charts below show the difference with the box checked and unchecked. I like the straight bar to connect the start and finish points clearer but is this correct? OR is the difference of .0007 so minor that I’m splitting hairs? (i can't seem to upload my images)
Lastly, as a confirmation, am I doing conducting the field testing correctly?
https://drive.google.com/...1ETHc&authuser=0
https://drive.google.com/open?id=0Bybxljl8xw55VVBuVGg1bVNfdXM&authuser=0
Thank you.