For those of you who care, the Chung-On-A-Stick Project is about making a 2-component wind velocity cycling sensor to help measure your aero coefficient of drag. Its ultimate aim is to allow The Chung Method – or Virtual Elevation – to work in a broader range of conditions.
Our latest update is about making some instrumentation to allow an educational wind tunnel to calibrate “The Stick”. Read and see the update here.
AndyF
http://andyfroncioni.com
im glad your technology is coming along well.
how is this going to be different the ibike in terms function and cost?
presumably two component means you will be able to measure the yaw angle of the wind to a degree?
Huh. When you said that you were going to take the probe to a wind tunnel, I assumed that you were going to one large enough that you could test it when mounted on a bike. W/o doing that, of course, you won’t know how much drag it adds to whole probe+bike+rider system, nor will you have a true “gold standard” against which to compare the final CdA estimates.
im glad your technology is coming along well.
how is this going to be different the ibike in terms function and cost?
For now, the goal for this product is that it will be a very short-run production. I don’t expect that there is an enormous demand for it. Just for fun, how much would you expect to pay for an on-bike wind sensor that measures yaw angle and speed?
In terms of function, it will measure yaw and speed, allowing Aerolab, for example, to be able to map out your CdA as a function of yaw.
If you have any other questions, please feel free to ask!
presumably two component means you will be able to measure the yaw angle of the wind to a degree?
Yes, that’s the whole aim of Chung-On-A-Stick. It will allow The Chung Method to work in a broader range of conditions.
Huh. When you said that you were going to take the probe to a wind tunnel, I assumed that you were going to one large enough that you could test it when mounted on a bike. W/o doing that, of course, you won’t know how much drag it adds to whole probe+bike+rider system, nor will you have a true “gold standard” against which to compare the final CdA estimates.
I’m sorry – I didn’t mean to mimic the famous Stonehenge scene in the movie “This is Spinal Tap”… 
I really hope I’m doing this in the right order, but my aim is to first get the sensor to work and then get the sensor to be aero itself.
For now all I can afford is to arrange to use a small educational wind tunnel to calibrate the probe. There are already plans when the sensor is built, by the way, to test the sensor in a full-sized wind tunnel. I just don’t want to burn those precious and expensive testing opportunities by having a poorly-calibrated probe.
I just wanted to add this…
Wind tunnel data – at least as far as I’ve been able to see – usually results in CdA vs yaw reports. The Chung-On-A-Stick has the potential to add a vital missing component to this: the yaw histogram of time. How much time do you spend at each yaw angle? Along with the tunnel data, this important information allows you to make a better guess of what components and postioning might get you the fastest times.