#1
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Bicycle sensors
In another thread, John proposed: "The NEW bicycle helmet
incorporating the speed sensitive flag pole (at no additional cost). The faster you go the more the flag pole bends. At a sedate 7 MPH the pole will be vertical and as speed increase the air resistance causes the pole to incline further and further from the vertical." Which reminded me of a cereal box toy one of my friends had when I was a teenager. It pretended to be a bike speedometer operated by the (relative) wind. As I recall, it was a pivoting airfoil. The faster the bike moved relative to the air, the more torque the airfoil exerted, cranking it clockwise against a scale purporting to read speed in miles per hour. I recall it being dismally inaccurate. And of course, it measured air speed, not ground speed. It might read 15 miles an hour while standing still. BUT: I'm a bit surprised that sophisticated bike cyclometers don't have an airspeed function. While I've never gotten even an altimeter model, I know you can get them with speed, distance, time, cadence, altimeter, percent grade, feet climbed, heart rate, etc. etc. Seems to me airspeed would be as interesting to gripe about as percent grade, no? -- - Frank Krygowski |
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#2
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Bicycle sensors
On 2016-04-24 07:33, Frank Krygowski wrote:
In another thread, John proposed: "The NEW bicycle helmet incorporating the speed sensitive flag pole (at no additional cost). The faster you go the more the flag pole bends. At a sedate 7 MPH the pole will be vertical and as speed increase the air resistance causes the pole to incline further and further from the vertical." Which reminded me of a cereal box toy one of my friends had when I was a teenager. It pretended to be a bike speedometer operated by the (relative) wind. As I recall, it was a pivoting airfoil. The faster the bike moved relative to the air, the more torque the airfoil exerted, cranking it clockwise against a scale purporting to read speed in miles per hour. I recall it being dismally inaccurate. And of course, it measured air speed, not ground speed. It might read 15 miles an hour while standing still. BUT: I'm a bit surprised that sophisticated bike cyclometers don't have an airspeed function. While I've never gotten even an altimeter model, I know you can get them with speed, distance, time, cadence, altimeter, percent grade, feet climbed, heart rate, etc. etc. Seems to me airspeed would be as interesting to gripe about as percent grade, no? Your problem seems to have been solved: http://www.ibikesports.com/how-newton-works/ -- Regards, Joerg http://www.analogconsultants.com/ |
#3
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Bicycle sensors
On 24/04/16 16:33, Frank Krygowski wrote:
In another thread, John proposed: "The NEW bicycle helmet incorporating the speed sensitive flag pole (at no additional cost). The faster you go the more the flag pole bends. At a sedate 7 MPH the pole will be vertical and as speed increase the air resistance causes the pole to incline further and further from the vertical." Which reminded me of a cereal box toy one of my friends had when I was a teenager. It pretended to be a bike speedometer operated by the (relative) wind. As I recall, it was a pivoting airfoil. The faster the bike moved relative to the air, the more torque the airfoil exerted, cranking it clockwise against a scale purporting to read speed in miles per hour. I recall it being dismally inaccurate. And of course, it measured air speed, not ground speed. It might read 15 miles an hour while standing still. BUT: I'm a bit surprised that sophisticated bike cyclometers don't have an airspeed function. While I've never gotten even an altimeter model, I know you can get them with speed, distance, time, cadence, altimeter, percent grade, feet climbed, heart rate, etc. etc. Seems to me airspeed would be as interesting to gripe about as percent grade, no? It is when it's a prevailing againsterly. http://www.otherpower.com/anemom2.html |
#4
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Bicycle sensors
On Sunday, April 24, 2016 at 9:33:09 AM UTC-5, Frank Krygowski wrote:
Seems to me airspeed would be as interesting to gripe about as percent grade, no? Airspeed would be similar to temperature. Maybe less important. Airspeed is important when it is against you. Headwind. But irrelevant or not considered when its with you. In contrast air temperature is relevant for the entire ride no matter which direction you are going. Depending on the direction of the wind, air temperature increases or decreases in importance. Wind chill. Lot of different factors. I suppose you could carry enough gear to measure temperature, wind speed and direction. As well as the mundane time, distance, speed, power output, direction, elevation. |
#5
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Bicycle sensors
On 04-24-2016 16:33, Frank Krygowski wrote:
I'm a bit surprised that sophisticated bike cyclometers don't have an airspeed function. While I've never gotten even an altimeter model, I know you can get them with speed, distance, time, cadence, altimeter, percent grade, feet climbed, heart rate, etc. etc. I've often considered (but will likely never actually do) putting a pitot-static system somewhere on my bike. I would have liked to see the numbers when I was working my butt off against a strong headwind a week ago. -- Wes Groleau |
#6
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Bicycle sensors
On Sun, 24 Apr 2016 10:33:05 -0400, Frank Krygowski
wrote: In another thread, John proposed: "The NEW bicycle helmet incorporating the speed sensitive flag pole (at no additional cost). The faster you go the more the flag pole bends. At a sedate 7 MPH the pole will be vertical and as speed increase the air resistance causes the pole to incline further and further from the vertical." Which reminded me of a cereal box toy one of my friends had when I was a teenager. It pretended to be a bike speedometer operated by the (relative) wind. As I recall, it was a pivoting airfoil. The faster the bike moved relative to the air, the more torque the airfoil exerted, cranking it clockwise against a scale purporting to read speed in miles per hour. I recall it being dismally inaccurate. And of course, it measured air speed, not ground speed. It might read 15 miles an hour while standing still. BUT: I'm a bit surprised that sophisticated bike cyclometers don't have an airspeed function. While I've never gotten even an altimeter model, I know you can get them with speed, distance, time, cadence, altimeter, percent grade, feet climbed, heart rate, etc. etc. Seems to me airspeed would be as interesting to gripe about as percent grade, no? Certainly and a simple propeller mounted on the helmet could be used to calculate "apparent" wind speed. Sail boats use this system. If this figure were to be compared with the actual speed of the bike a "wind factor" could be determined. I suspect that the propeller on the beanie is probably a major factor in the system's failure to become popular :-) -- Cheers, John B. |
#7
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Bicycle sensors
On Sun, 24 Apr 2016 12:04:33 -0700 (PDT), "
wrote: On Sunday, April 24, 2016 at 9:33:09 AM UTC-5, Frank Krygowski wrote: Seems to me airspeed would be as interesting to gripe about as percent grade, no? Airspeed would be similar to temperature. Maybe less important. Airspeed is important when it is against you. Headwind. But irrelevant or not considered when its with you. In contrast air temperature is relevant for the entire ride no matter which direction you are going. Depending on the direction of the wind, air temperature increases or decreases in importance. Wind chill. Lot of different factors. I suppose you could carry enough gear to measure temperature, wind speed and direction. As well as the mundane time, distance, speed, power output, direction, elevation. Actually "airspeed" is an important factor. Undoubtedly more important than temperature. After all, "airspeed" was the determining factor in settling the Americas. Without it the "Indians" would still be running the place. -- Cheers, John B. |
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