AeroPod, PowerPod and Newton

Hi.

Attached is a ride ending at a high power after having hit a bump in the road. (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:

Thank you, John, locking the suspension not being an option on my bike, I'll have to remove the results - though it would seem rather arbitrary.

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.

Nope, that is a real power spike, caused by you accelerating from 10 to 30 km/h.

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?

Please post your unedited ride file so I can take a look.

today's ride

jonao wrote: ↑Sat Aug 24, 2019 2:38 pm today's ride iBike_08_24_2019_1146_34_km.ibr

Your unit is not calibrated; you have a default value of wind correction in your ride file. Load the attached profile into your device.

I deleted the first 5 minutes of your ride, then used a trick to fix your calibration: the "Analyze/Analyze Route" command.

After applying the Analyze Route command it's obvious where your position changed.
I deleted 3 small sections, each about 4 minutes long. You have plenty of data for your training analysis!
Your CdA seems quite low; what is your height, and are you riding on the hoods or perhaps upright?

.....2 questions...
1) After importing your cal-file it cannot be sent to the PP, both fric and tilt being out of range. 2) I tried correcting the ride as you did, the result looking similar, but my max slope still being at 49%, while yours is 6%. Any idea?

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==> start at 5 minutes ==>

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

Stick with DPS. It will minimize watts spikes.

Alright DPS.

Do you have any suggestions about the not wanting to be PP-loaded .ibp you provided?

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?

Please do a new calibration ride. Your profile is so far out from the norm that an adjusted profile is out of range.

did so, in Isaac adapted CdA and Crr as found from my circuit fit, and set in PP.
Wait and see what it will bring.

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: set profile 2 days ago: 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.

Should I move my latest message to another forum board?

SO, how can I change CdA & Crr in the PP and keep those values fixed?

jonao wrote: ↑Tue Sep 03, 2019 11:46 am SO, how can I change CdA & Crr in the PP and keep those values fixed?

1. Go to "Edit/Edit Profiles/Extract Profile from Device" This will transfer the profile that is currently stored by PP

2. Click on the Advanced tab

3. For CdA, click the radio button next to "Wind ScalingAdjust" Adjust will change to Hold, and the radio button next to CdA will change to Adjust

4. Type in the CdA field the number you want to use. You will get a warning message; click OK

5. Repeat the process above to change the Crr number to the number you want

6. Click the "Send to Device" button to store your modified profile in your PP.

7. Click the "Accept" button to save your modified profile in Isaac (you might want to give it a different name)