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Fluid trainer Calibration

Started by The Evil Twin · · Last activity · 8 posts · 1,462 views

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01 / Original postFluid trainer CalibrationThe Evil Twin · 19 Dec 2006 02 / This pagePosts 1–8Page 1 of 1 · chronological order 03 / Latest replyPost #8alpha2k · 27 Dec 2006

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Original section
Cycling Training
Published
19 December 2006
Last activity
27 December 2006
Original author
The Evil Twin
Posts
8
Discussion status
Public discussion
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1,462
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0
Topics
CadencePower metersTyre pressure

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  1. Original post
    The Evil Twin
    Archived post
    #1

    I was wondering if anyone has ever used a power meter to calibrate their trainer.
    Perhaps a graph so that at a given gear ratio and cadence, we would know the wattage output.
    I have a Kurt Kinetic -does Kurt give out this info??

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  2. The Evil Twin
    Archived post
    #2

    Duh, i should have seen this the first time:

    kurtkinetic.compowercurve.php

    however, that's just speed as the measure.

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  3. wiredued
    Archived post
    #3

    I think those graphs are based on Power Tap measurements this calibration chart is also helpful.

    kurtkinetic.comcalibration chart.php

    The Evil Twin said:

    Duh, i should have seen this the first time:

    kurtkinetic.compowercurve.php

    however, that's just speed as the measure.

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  4. Pureshot78
    Archived post
    #4
    The Evil Twin said:

    Duh, i should have seen this the first time:

    kurtkinetic.compowercurve.php

    however, that's just speed as the measure.


    Speed is the only measure you need. Gear ratio doesn't matter.
    FWIW, the KK "power computer" is just a speedo that has an algorithm built in to convert speed on their trainer to watts.

    Make sure the trainer is warmed up sufficiently and you should be good to go!
    I did a whole winter's worth of training using speed only and had no clue what wattage i was doing until the spring when i bought my first PM.
    The repeatability of using speed alone allowed me to see the progress i was making.

    Good luck!

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  5. The Evil Twin
    Archived post
    #5

    I guess I could just get a cheap computer and mount the sensor on the back wheel to measure speed.

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  6. wiredued
    Archived post
    #6

    http://www.kurtkinetic.com/power_computer.php

    The Evil Twin said:

    I guess I could just get a cheap computer and mount the sensor on the back wheel to measure speed.

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  7. RapDaddyo
    Archived post
    #7
    Pureshot78 said:

    Speed is the only measure you need. Gear ratio doesn't matter.

    I agree. And, speed alone is sufficient for riding at the appropriate intensity for whatever adaptation one is targeting.

    I would caution not to read too much precision into the speed/power tables (for anybody's trainer). The tire and tire pressure alone can affect this relationship. But, as to targeting specific adaptations, the absolute watts are irrelevant.

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  8. alpha2k
    Archived post
    #8
    The Evil Twin said:

    Duh, i should have seen this the first time:

    kurtkinetic.compowercurve.php

    however, that's just speed as the measure.


    Kinetic Cyclone:
    P = (6.481090) * S + (0.020106) * S3

    Kinetic Road Machine:
    P = (5.244820) * S + (0.01968) * S3

    For example, to calculate how much power is produced at a speed of 16.1mph while riding the Kinetic Road Machine, plug 16.1 in for “S.”

    P = (5.244820) * (16.1) + (0.01968) * (16.1)3
    P = (5.244820) * (16.1) + (0.01968) * (16.1) * (16.1) * (16.1)
    P = 84.4416 + 79.9935
    Power = 164 watts

    That's how Kinetic maps speed to power.
    I use CycleOps Fluid 2. Is there any mapping table or arithmetic to map the speed on CycleOps to power? I'm planing to connect the speed sensor to a laptop and design a software to display and analyze the data. I can share it if I make it.

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