(Please, don't bother about the absolute power values, depending on my accepted calibration obviously).
My Powerpod sits tightly on my handlebar, but the handlebar has a suspension in the bike frame to its front wheel,
not being a race bike, but a sporting one.
Did I gather correctly that a suspension move may result in such off power values?
Is there anything to be done preventing such odd power values?
Yes, what you are seeing is the effect of the suspension on power readings. When you hit a bump your PP momentarily is knocked out of its usual position, causing power changes.
The best way to minimize this problem is to lock-out your suspension.
If you are using your ride files for training purposes, after the ride you can highlight the "bumps" and remove them from the ride file:
Attachments
Screen Shot 2019-08-21 at 11.23.15 AM.png (142.59 KiB) Viewed 283610 times
Screen Shot 2019-08-21 at 11.22.51 AM.png (734.25 KiB) Viewed 283610 times
Screen Shot 2019-08-21 at 11.22.31 AM.png (145.97 KiB) Viewed 283610 times
After deleting the 4 most spurious peaks from todays ride, I now more clearly see a remaining odd power peak when breaking at 27 minutes.
Is it my real acceleration in this case?
I suspect it comes from the suspension generated semi-slope values too.
If so, the Powerpod seems being of no practical use to me as fitted to my handle bar.
John,
Thank you very much.
I'm glad you could recognize it. Now I can see it too.
Even with that peak as shown I had to remove 50% of the total ride-time/distance to get this plot.
And in today's ride (not shown), again I had to remove half of the ride containing the spurious peaks.
Can such remains still tell me anything about my training?
Last edited by jonao on Sat Aug 24, 2019 11:57 am, edited 1 time in total.
Today I succeeded in having my suspension fixed as far as it can. Now at the road bumps the power seems to behave,
and only at start up it is sill off to the sky.
Would it be of any further help to have the PP not smooth power dynamicallly, but say 2 sec, of even 0 sec?
jonao wrote: ↑Mon Aug 26, 2019 5:30 am
Today I succeeded in having my suspension fixed as far as it can. Now at the road bumps the power seems to behave,
and only at start up it is sill off to the sky.
Would it be of any further help to have the PP not smooth power dynamicallly, but say 2 sec, of even 0 sec?
full ride==> iBike_08_26_2019_0933_15_km.ibr
start at 5 minutes ==>
2018-08-26-at 5 min.PNG
By the way, reading through our corresponce I hit your remark "Your CdA seems quite low; what is your height, and are you riding on the hoods or perhaps upright?" - and I cannot find my answer, though I am pretty sure I did send feedback. So, here it is again.
Yes my CdA is low, my height =136cm, and I am sitting upright.
I tried fiddling with the CdA value in Isaac, I also rode circuit rounds and extracted the best fitting results from my own Chung virtual-elevation analysis, but when I tried inserting them into the calibration some other parameters had become "out of range".
So I stopped and chose accepting the setting as it was, not caring for absolute Power, but wanting to see how the power develops
between rides.
As long as those sky high bump peaks were there, that failed. But since they are now gone, I have high hopes.
Maybe some day I should repeat an out&go recalibration and start using that.
But I still do not understand how I can first instruct the PP to use, say, CdA=0,6, and not have that value being recalculated during the out&go ride.
If I set it in Isaac to 'fixed' after importing the Out&Go ride, until now I ran into those 'out of range' warnings for other parameters too.
Do you have any idea why the jonao.ibp you provided to me, will not load into my PP but complain about 'out of range' values too?
disappointment: In today's new ride, after reading it into Isaac, the values of CdA&Crr are NOT as those exported, but the original values back which I especially had replaced;
todays:
CdA has unwantedly been switched back.PNG (198.67 KiB) Viewed 283371 times
set profile 2 days ago:
settings of 20190828 as sent to device PP.PNG (196.17 KiB) Viewed 283371 times
also I received an unknown error 6004 while automatic downloading from PP to Isaac, and only after closing the error message was able to download from the PP.
1. fout melding Isaac.PNG (16.2 KiB) Viewed 283371 times