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This is a very basic demonstration of Chung-on-a-Stick’s ability to sense yaw and airspeed. The hair dryer doesn’t have a very wide airstream, but it still allows us to see how the Stick works. Chung-On-A-Stick is wind tunnel calibrated to tight tolerances. Yaw and airspeed, by the way, are in the rightmost [...] Yaw angle calibration in a wind tunnel Last night, our wind tunnel testing finally produced some milestone results: full yaw measurements from -20 degrees to +20 degrees. Shown in this photo is our setup for calibrating the probe. The probe mount has a dial indicator that measures yaw angle very accurately. One of the big questions was [...] Due to the unexpected delays in getting tunnel time, the team was able to regroup and redesign the aero probes from scratch. The result is a whole new set of probes that have been CFD-designed to optimize yaw sensitivity. Here is the whole story in photos: [View with PicLens] [...] How does the windless Chung Method fare in the presence of windy ride data? What constitutes a favourable field testing day? How sensitive are CdA and Crr estimates when data is polluted with wind that we don’t know anything about? What accuracy do we need to adequately measure wind with Chung-On-A-Stick? How [...] So, how do we know Aerolab actually works? Oh, sure, it seems to give the right answers. But how do we build confidence that Aerolab and all its future versions will be the best they can be? Enter toy_ride, a perl script to generate test files in iBike format with known answers. Toy [...] If you’ve been wondering what was happening with Aerolab lately, here’s the scoop. I’ve been at work developing Chung-On-A-Stick, a planar velocity sensor for doing virtual elevation work. It’s involved a lot of time, some extremely good friends, and a few dollars but things are finally coming together nicely. With any luck, we’ll [...] As GoldenCheetah prepares for its upcoming release, I wanted to keep you all posted about the development of the virtual elevation module, Aerolab. Aerolab is not currently in Golden Cheetah, but I’m hoping it may eventually find its way there. There’s tons of work still to be done, but at least we [...] Thanks to Adrien Gontier of Roues Artisanales and David Linke, I am able to provide you with a unique database of moments-of-inertia and effective rotational masses of a large number of wheelsets. The data allows greater accuracy for VE, a virtual elevation perl script I wrote. The big surprise is that [...] The method of Virtual Elevation and all its variants are derived from Newton’s 2nd Law for linear motion, neglecting rotational inertia terms. Do those additional terms play a significant role in elevation-matching? Can we accurately measure the moment of inertia (MOI)? In this post, I’ll describe the terms and provide a [...] A recent discussion on the Wattage Training Forum got me to hack the VE code to quantify the difference between the exact and small-angle version of the VE calculation. The columns of the resulting CSV file are as follows: SAMPLE #: row index The final [...] |
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