Aero experts opinion requested :-).
We have a client that did a comparison test with an aerolab sensor test between his Felt IA disc and the Ku TF1 and went, according to Ku who performed the test, from a Cda of 0.262 (highest Cda in the test runs on his Felt) to a Cda of 0.204 on the TF1 from Ku. And he is not a small guy, broad shoulderd, 80 kg but good athlete, 8.30-8.45 IM finish time.
I find this a huge improvement, almost impossible big when considered the position staying almost the same and also helmet and suit) and I would have expected to see a significant increase in speed with about the same power but that was not the case, there was an improvement but not as big as I would expect with this improvement, but maybe I’m wrong.
A few things that were also standing out during the test was that there was no crank length check (if they were the same), the Felt was equiped with hydration bottles at the back of the saddle, not the same wheels were used and this would have been an easy swap and in the pics in the report the aero sensor seemed to be a little tilted up on the Felt and a little down on the TF1. This also would have impacted the test maybe, I have no experience with the aero lab sensor.
I’m just really curious what the experts would have to say about this test, if we can call it that with some variables not being equal?
I have worked for Ku a year as a consultant in 2020 and we did aero testing in a velodrome using alpha mantis so the bike is not new to me at all and I think it is fast but so fast as they want us to believe with this test. I almost wonder if these improvements that were given to the client are a little or very much coloured by the fact that the manufacturer of the bike is also the one taking the tests 
When we did the aero tests in 2020 they were performed by Gebiomized (we didn’t see any results until a few eeks after the tests were done) and we compared my position the the P5 disc to a exact same position on the TF1, swapped wheels and the crankset with PM for every run, helmet and suit the same, saddle exacty the same. The results are to be found on their website, I’m the tester Jeroen van Geelen (one thing they still swapped is the combined weight, the P5 is the lighter total instead of the TF1) and the lowest Cda for the P5 was when I did a test run adn even swapped the Zipp Vuka AXS aerobar extensions to the Cervelo instead of my normal PD 4525 shape.
You can find my test nere https://www.ku-cycle.com/performance-test/
The differences are so much smaller and also more consistent then with the new aerolab sensor test.
And the tested client and myself wonder if this is even possible to have such a massive difference when the overall position is about the same.
test results added in the links.
Let me know what you think experts
Jeroen
