Power meters · Public discussion

Odd power curve

Started by peterwright · · Last activity · 6 posts · 975 views

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Power meters
Published
10 September 2006
Last activity
12 September 2006
Original author
peterwright
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6
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  1. I raced on Sat with a new (replacement) SL hub on my race wheel. The power curve looks odd in that it has a lot of what I can only describe as "square peaks" - where the power peaks and then stays at the same exact power for 2-4 secs before reducing. I have never seen a graph look like this. There were also many very small data drops as indicated by a very small gap in power data and a drop in speed to zero (they do not coincide and so may be totally unrelated)

    Has anyone experienced anything like this ?

  2. peterwright said:

    I raced on Sat with a new (replacement) SL hub on my race wheel. The power curve looks odd in that it has a lot of what I can only describe as "square peaks" - where the power peaks and then stays at the same exact power for 2-4 secs before reducing. I have never seen a graph look like this. There were also many very small data drops as indicated by a very small gap in power data and a drop in speed to zero (they do not coincide and so may be totally unrelated)

    Has anyone experienced anything like this ?

    No. The only thing close to that was before I had solved my receiver vibration problem. I assume you zeroed the torque.

  3. Square Peaks: Need to change the hub batteries I bet. It extrapolates/fills in missing samples.

  4. Spunout said:

    Square Peaks: Need to change the hub batteries I bet. It extrapolates/fills in missing samples.

    What extrapolates the missing samples ?

    Hub, CPU or software ?

  5. i see this when i get emi induced data drops, which is very seldom for me; the power readings flat-line then there's a drop. i have a pt pro, though. in my experience, it always happens with drops.

  6. jws said:

    i see this when i get emi induced data drops, which is very seldom for me; the power readings flat-line then there's a drop. i have a pt pro, though. in my experience, it always happens with drops.

    Interesting - but I have only experienced this with this particualr hub and not my other one (ridden on the same routes)

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