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PostPosted: Thu Feb 09, 2017 1:15 pm 
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Shop Owner

Joined: Sat Feb 13, 2010 7:41 pm
Posts: 98
Location: UK
Hi All,

As per title really, I'm investigating into a pitot or similar device to give wind direction and speed in one item. Pitot tubes are available with both speed and yaw but all seem to be for high speed application.

Anyone came across such a device, maybe also with logger capabilities?

Steve


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PostPosted: Thu Feb 09, 2017 4:38 pm 
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Joined: Tue May 23, 2006 4:33 am
Posts: 1093
You're looking for a device to measure cycling speed? The problem with such devices is that they basically measure VMG and not true on-the-ground velocity. At high speeds (4-5x maximum wind speed) your on-the-ground velocity starts to approximate VMG, but not until then. Pitot tubes assume a predictable wind direction (i.e., from straight ahead, achieved by sufficient speed so the cyclist would make the apparent wind speed). There have been a few devices in the past to measure bike speed this way, but regular cyclometers based on GPS or magnetic sensors or accelerometers always did better.


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Posted: Thu Feb 09, 2017 4:38 pm 


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PostPosted: Thu Feb 09, 2017 6:56 pm 
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Joined: Sat Jan 21, 2017 10:56 am
Posts: 36
I think hp wants something like this: http://www.sutron.com/product/wind-spee ... on-sensor/ that would transmit ant+ wind direction/speed data. It'd be possible to make something using that, a compass chip, and an ant+ module and some programming. But none that I know of exist already. You could also use whatever FLO used: http://www.flocycling.com/img/aero-data-logging@2x.jpg


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PostPosted: Thu Feb 09, 2017 8:10 pm 
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Shop Owner

Joined: Sat Feb 13, 2010 7:41 pm
Posts: 98
Location: UK
Thanks all, but the device needed is basically what Flo used but in a 2017 up to date version, ie not a whole `house` of equipment hanging off front of bike.

In short, its needed for bike, component, rider aero testing, outdoors. I am aware of most of the pitfalls but with the aid of a device to measure wind speed+direction we can more accurately calculate advances, even on days when small weather changes happen.


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PostPosted: Fri Feb 10, 2017 12:47 am 
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Joined: Thu Jan 08, 2009 1:41 pm
Posts: 288
Location: Shetland, Scotland
James Webb is working on a device.
Interview in the Cycling Time Trial podcast #82 "James Webb and the Skippy Project-Home Aero Testing".
https://itunes.apple.com/gb/podcast/cyc ... 84232?mt=2


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PostPosted: Wed Feb 15, 2017 12:57 am 
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Joined: Sat Jan 21, 2017 10:56 am
Posts: 36
This thread talks about the AeroStick that AlphaMantis is developing : http://forum.slowtwitch.com/forum/Slowtwitch_Forums_C1/Triathlon_Forum_F1/Zipp_Accidentally(%3F)_Shows_Off_the_%22Aero_Stick%22_in_NSW_454_Video_P6131956/


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Posted: Wed Feb 15, 2017 12:57 am 


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