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Tacx Flow Turbo Power Query

  • 05-12-2011 1:01pm
    #1
    RedB
    Registered Users, Registered Users 2 Posts: 1,469 ✭✭✭


    I attempted my first FTP test on my Turbo last night but I'm having a bit of difficulty deciphering the results so I was hoping someone could enlighten me.
    It was a bit old school whereby I noted the running total power reading and overall average power readings at various time points in my WU/TT/WD and I thought it would be a simply calc to establish my average power reading during the TT. I assumed the overall average power reading would be the average reading I held for a particular time period and I assumed that time period would be an hour. I also assumed that the total power would correspond simply to the average power x time period e.g. I assumed if I held my average power at 200W then my total power reading after 1/2 hour would be 100W (and after 1 hour would be 200W). However, it didn't throw up those kind of numbers but there does seem to be a consistant factor involved.
    I went back to the manual where it says that its not actually a running total of power in watts thats displayed but a kilocal / kilojoule value. When I plug the Kilo Joule into my convertor the closest thing I get to watts thats in the ballpark is watt-hours. It still doesn't fully tally with the figures I noted but I'm wondering is there an efficiency factor also to be taken account of.

    Figures:
    15 min Warm Up - Avg = 169 W, Total = 145 (kj?) - Trip counter reset as calibrated Turbo.
    60 min Session incl more WU / TT / WD - Avg 189 W, Total = 650 (KJ)

    During the 20min TT section I was seeing an average power display of 240-245. The difference in trip Total suggests 278 (kj?) during this period which corresponds to 77.2 Watt-hour. Is this the same as 77.2 x 60 / 20 = 231 W average over 20 mins TT?


Comments

  • #2
    tunney
    Registered Users, Registered Users 2 Posts: 12,584 ✭✭✭✭tunney


    RedB wrote: »
    I attempted my first FTP test on my Turbo last night but I'm having a bit of difficulty deciphering the results so I was hoping someone could enlighten me.
    It was a bit old school whereby I noted the running total power reading and overall average power readings at various time points in my WU/TT/WD and I thought it would be a simply calc to establish my average power reading during the TT. I assumed the overall average power reading would be the average reading I held for a particular time period and I assumed that time period would be an hour. I also assumed that the total power would correspond simply to the average power x time period e.g. I assumed if I held my average power at 200W then my total power reading after 1/2 hour would be 100W (and after 1 hour would be 200W).

    Replace power with speed and think of this again.
    If you rode at 30kph average for 60 minutes what would your average be at 30 minutes? (Assume a steady speed).

    RedB wrote: »
    However, it didn't throw up those kind of numbers but there does seem to be a consistant factor involved.
    I went back to the manual where it says that its not actually a running total of power in watts thats displayed but a kilocal / kilojoule value. When I plug the Kilo Joule into my convertor the closest thing I get to watts thats in the ballpark is watt-hours. It still doesn't fully tally with the figures I noted but I'm wondering is there an efficiency factor also to be taken account of.

    Figures:
    15 min Warm Up - Avg = 169 W, Total = 145 (kj?) - Trip counter reset as calibrated Turbo.
    60 min Session incl more WU / TT / WD - Avg 189 W, Total = 650 (KJ)

    During the 20min TT section I was seeing an average power display of 240-245. The difference in trip Total suggests 278 (kj?) during this period which corresponds to 77.2 Watt-hour. Is this the same as 77.2 x 60 / 20 = 231 W average over 20 mins TT?


    I think you really need to retest.

    Warm up, calibrate, reset the counters (keeping the calibration), do a 5 minute all out TT. Note averages. Reset the counters. Do a 20 minute all out TT. Note averages.

    92-95% of this figure is an approximation of your FTP. While numbers are repeatable for your flow they will be +/- actual wattage.


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