Search found 101 matches

by BillOsler
Wed May 22, 2019 10:35 pm
Forum: AeroPod
Topic: Is there any way to test whether the Aeropod is functioning correctly?
Replies: 7
Views: 343

Re: Is there any way to test whether the Aeropod is functioning correctly?

Your assumption about processor power is wrong. AP on-board processor has access to the raw data and works well; Isaac must re-process exported data. There are any number of posts in the forum that appear to suggest that the IBR file contains the raw data collected during the ride, though some of t...
by BillOsler
Tue May 21, 2019 9:56 pm
Forum: AeroPod
Topic: Confused by multiple CdA results
Replies: 11
Views: 414

Re: Confused by multiple CdA results

It is very frustrating to be given data to analyze, then to analyze it, and afterwards to be told "the file I submitted was not optimal for use with AeroPod". Please, if you are asking for assistance, provide the best information you can... I apologize for any frustration caused. I was surprised by...
by BillOsler
Tue May 21, 2019 9:30 pm
Forum: AeroPod
Topic: Is there any way to test whether the Aeropod is functioning correctly?
Replies: 7
Views: 343

Re: Is there any way to test whether the Aeropod is functioning correctly?

I think what is happening is that Isaac CdA Analysis is being pushed beyond its current capabilities (we have more current algorithms in AeroPod than in Isaac). I hope that addressing the MANY deficiencies in Isaac is on the agenda for the future? I would have thought that since Isaac has access to...
by BillOsler
Mon May 20, 2019 11:47 pm
Forum: AeroPod
Topic: Is there any way to test whether the Aeropod is functioning correctly?
Replies: 7
Views: 343

Is there any way to test whether the Aeropod is functioning correctly?

I have not yet been able to obtain any credible data with the Aeropod. It's not for lack of trying, I just don't seem to be able to get any degree of reproducibility between trials. I'm willing to accept that others believe they have been able to generate meaningful data. One possibility is that I'm...
by BillOsler
Fri May 17, 2019 9:27 pm
Forum: AeroPod
Topic: Confused by multiple CdA results
Replies: 11
Views: 414

Re: Confused by multiple CdA results

And another example from the same day: https://velocompforum.com/download/file.php?id=5785 It would appear that Isaac has a hard time deciding what the CdA actually is. Addend: I realized after-the-fact that in the picture I highlighted average cadence instead of average HR in the summary data. Corr...
by BillOsler
Fri May 17, 2019 9:18 pm
Forum: AeroPod
Topic: Confused by multiple CdA results
Replies: 11
Views: 414

Re: Confused by multiple CdA results

I understand that the file I submitted was not optimal for use with Aeropod. It was just a handy example of a discrepancy in the analysis of the data. I was not actually aiming to get a CdA measurement from Aeropod on that ride. In fact I'm close to abandoning Aeropod for its intended use because I ...
by BillOsler
Thu May 16, 2019 8:30 pm
Forum: AeroPod
Topic: Confused by multiple CdA results
Replies: 11
Views: 414

Re: Confused by multiple CdA results

The IBR for that portion of the ride:
by BillOsler
Thu May 16, 2019 6:00 am
Forum: AeroPod
Topic: Confused by multiple CdA results
Replies: 11
Views: 414

Confused by multiple CdA results

While trying to analyze some data I realized that Isaac is offering me THREE different CdA results for the same data. I recorded a ride in Profile 4 using my Aeropod and the bike's DFPM. I edited the activity to remove everything except for 3 laps of a loop. The loop was not ideal because it require...
by BillOsler
Fri May 10, 2019 1:10 pm
Forum: AeroPod
Topic: AeroPod CdA Connect IQ app for Garmin
Replies: 23
Views: 4003

Re: AeroPod CdA Connect IQ app for Garmin

The impression I have from prior posts is that the Velocomp Connect IQ app won't be in the Garmin app store any time soon. My guess is that the current app will have to be updated if/when there is an Ant+ standard for communicating CdA and related data. I hope that whenever that happens the app will...
by BillOsler
Mon May 06, 2019 6:44 am
Forum: AeroPod
Topic: Question about headwind
Replies: 1
Views: 149

Question about headwind

I understand from another thread that the wind speed reported by Aeropod is the apparent wind speed opposite of the direction of travel, ie: apparent headwind. I have been trying to correlate results from Aeropod with results from Golden Cheetah's Aerolab and have encountered some odd results. I hav...
by BillOsler
Sun May 05, 2019 2:00 pm
Forum: Isaac software
Topic: Question about Isaac's data reporting
Replies: 3
Views: 548

Re: Question about Isaac's data reporting

Velocomp wrote:
Thu May 02, 2019 5:45 pm
I don't know :-(
It seems to me that it would be important to know what pressure is being reported when working with aerodynamics.
by BillOsler
Sun May 05, 2019 1:47 pm
Forum: Isaac software
Topic: Problem with altitude adjustment
Replies: 2
Views: 188

Re: Problem with altitude adjustment

The Analyze Route option looks for symmetry and same/similar starting and ending elevation. If it finds that it will offer the option to make the start/stop elevation the same. If it doesn't think the end point is the same as the start point it won't. This feature applies to the entire ride, not to...
by BillOsler
Wed May 01, 2019 5:54 pm
Forum: AeroPod
Topic: Workflow for analyzing a file
Replies: 3
Views: 201

Re: Workflow for analyzing a file

The issue with weight is this: Depending on which bike I ride and what equipment I have on it there can be a difference of several pounds in total weight. When I initiate sensor pairing the Aeropod has no way of knowing what the correct weight is for the bike even if it has my weight right. On any g...
by BillOsler
Tue Apr 30, 2019 7:56 pm
Forum: AeroPod
Topic: Workflow for analyzing a file
Replies: 3
Views: 201

Workflow for analyzing a file

Calibration rides are ideally done on relatively flat courses so rider weight does not enter into the calibration. On the other hand real-world loops generally have some climbing and weight does become an issue. If I calibrate the Aeropod in the field and then proceed with CdA testing the ride file ...
by BillOsler
Tue Apr 30, 2019 7:29 pm
Forum: Isaac software
Topic: Problem with altitude adjustment
Replies: 2
Views: 188

Problem with altitude adjustment

As part of the "analyze route" functionality Isaac offers a couple of choices for correcting altitude measurements. As best I can tell selecting a time range from the workout does not affect what Isaac displays in the Analyze Route dialog, it always seems to display the entire workout in the analyze...
by BillOsler
Tue Apr 30, 2019 7:08 pm
Forum: Isaac software
Topic: Question about Isaac's data reporting
Replies: 3
Views: 548

Question about Isaac's data reporting

When viewing data from my Aeropod in Isaac for Windows 5.0.1 one of the statistics that is reported is the ambient pressure in mBarrs (or hPa if you prefer). Today Isaac reported a pressure of 1026 mbar at a mean elevation of 726 feet. A barometer reported an uncorrected ambient pressure of 998 mbar...
by BillOsler
Sun Apr 28, 2019 5:52 pm
Forum: AeroPod
Topic: Is there a way to set the Aeropod date/time in the field?
Replies: 5
Views: 205

Re: Is there a way to set the Aeropod date/time in the field?

Pairing is normally done while the bike is not moving. I have never had a problem when I pair the sensors at rest. This might be the easiest way to solve your problem. Yes, obviously ... but I do think you should be aware of the behavior and the fact that when things go awry a hard reset is sometim...
by BillOsler
Sun Apr 28, 2019 2:12 pm
Forum: AeroPod
Topic: Is there a way to set the Aeropod date/time in the field?
Replies: 5
Views: 205

Re: Is there a way to set the Aeropod date/time in the field?

1. How would Isaac know the date/time is wrong, before the user says it is wrong? I understand that changing an app can be a complicated process but as it stands the lack of a user interface for the Aeropod is an obstacle that users have to work around, not what I would expect from a user-friendly ...
by BillOsler
Sun Apr 28, 2019 1:55 pm
Forum: AeroPod
Topic: Unexpected behavior at start of ride
Replies: 2
Views: 128

Re: Unexpected behavior at start of ride

I'm not sure whether the first behavior (problems if I'm moving when I start the pairing) is 100% of the time ... but today it happened both times I tried, and I had to a hard reset after both. The second time I decided to stop for the whole paring process and things went as expected. Regarding the ...
by BillOsler
Sun Apr 28, 2019 12:31 pm
Forum: AeroPod
Topic: Is there a way to set the Aeropod date/time in the field?
Replies: 5
Views: 205

Is there a way to set the Aeropod date/time in the field?

After having to reset the Aeropod again during my ride today I was reminded that resetting the Aeropod also resets its clock. Is there not a way to set the clock in the field? I realize I can change the date/time In Isaac but that works only if I actually remember what time it was when I set the Aer...
by BillOsler
Sun Apr 28, 2019 12:19 pm
Forum: AeroPod
Topic: Unexpected behavior at start of ride
Replies: 2
Views: 128

Unexpected behavior at start of ride

I've noted a couple of things that may represent problems with the pairing/calibration process. If I try to start the sensor pairing process while riding (ie: while actually moving) the Aeropod may pair successfully with the sensors but the subsequent behavior may not follow the expected sequence of...
by BillOsler
Sat Apr 27, 2019 10:50 pm
Forum: AeroPod
Topic: sensor pairing cal ride clarification request
Replies: 4
Views: 204

Re: sensor pairing cal ride clarification request

The reported power from the Aeropod stays at zero until I press the button to begin the out-and-back I do not stop to press the button, I do it while riding When power gets to 50 and I stop IIRC the Garmin shows 50 briefly and then it may drop to zero (not sure about that) and when I start back it b...
by BillOsler
Sat Apr 27, 2019 6:39 pm
Forum: AeroPod
Topic: sensor pairing cal ride clarification request
Replies: 4
Views: 204

Re: sensor pairing cal ride clarification request

I cannot give an official answer but I have not had much luck starting the calibration ride immediately after pairing. My experience is that it works better to ride briefly until the indicator light starts flashing prior to pressing the button to start the out-and-back portion.
by BillOsler
Sat Apr 27, 2019 11:21 am
Forum: AeroPod
Topic: First 5 minutes of a ride
Replies: 0
Views: 130

First 5 minutes of a ride

I understand that the first 5 minutes of a new ride are critical for purposes of re-calibrating the tilt sensors of the Aeropod. I'm not sure I have this right but my impression is that the point to the 2-step initial calibration is that the first few minutes (when power ranges 0-50 then 50-70) is t...
by BillOsler
Sat Apr 27, 2019 11:01 am
Forum: AeroPod
Topic: Air density estimates
Replies: 8
Views: 300

Re: Air density estimates

Thank you for the detailed response. That makes sense.
I'm not sure that the air density (rho) reported by Isaac in the exported CSV files matches well with the temperature and pressure values reported for the ride file but the differences are small.
by BillOsler
Wed Apr 24, 2019 6:47 am
Forum: AeroPod
Topic: Air density estimates
Replies: 8
Views: 300

Re: Air density estimates

Does the equation AeroPod uses to covert air pressure to wind speed have air density in it? If it does, how is the air density value determined? Yes. We get air density from barometric pressure sensor measurements. That's the problem. In order to get air density from pressure you have to know or im...
by BillOsler
Tue Apr 23, 2019 8:46 am
Forum: AeroPod
Topic: Do profiles 1-3 still auto-adjust calibration?
Replies: 1
Views: 105

Do profiles 1-3 still auto-adjust calibration?

In the post about the new firmware there is a statement that the new calibration verification during the first 5 minutes applied only to profile 4. Does that mean that in profiles 1-3 the aeropod still checks and adjusts the calibration periodically during each ride?
by BillOsler
Tue Apr 23, 2019 7:05 am
Forum: AeroPod
Topic: Air density estimates
Replies: 8
Views: 300

Re: Air density estimates

OK. I'd have to work through the equations but intuitively at least the resistance from air would be related to the pressure differential * CdA and that might get around needing humidity for the CdA calculation ... but the Connect IQ app does report wind speed and the CSV files exported by Isaac rep...
by BillOsler
Mon Apr 22, 2019 10:46 pm
Forum: AeroPod
Topic: Air density estimates
Replies: 8
Views: 300

Air density estimates

I may have this wrong ... my fluid dynamics training was a long time ago and mostly revolved around liquids, not gases, but IIRC the resistance from air depends on air density. Air density depends on a combination of barometric pressure and the mix of gases. Since the oxygen, carbon dioxide and nitr...
by BillOsler
Sat Apr 20, 2019 9:55 pm
Forum: AeroPod
Topic: What is displayed in the Wind Speed field of the exported CSV files?
Replies: 4
Views: 162

What is displayed in the Wind Speed field of the exported CSV files?

I've never been quite sure what exactly is displayed in the Wind Speed field of the CSVs that Isaac exports. It appears that Golden Cheetah can access the Wind Speed data ... but whether it can use it in a meaningful way is unclear. When Isaac exports the Wind Speed is it the measurement from the Pi...