AeroPod, PowerPod and Newton

John You say the auto-correction algorithm work so well, but I often use my Newton on my MTB finding rare watt readings after riding longer than 5 minutes on gravel roads or small tracks. I have two questions I hope you could answer me: 1.I can see the point in removing the tilt cal because of the a...

Just downloaded Isaac 2.10. The wind scaling difference is the same as in ver.2.03 (and 2.01) With my "test ride file" Isaac calculate wind scaling number to 1.027, and Ibike Newton calculate wind scaling number to 1.07. (3.01 firmware and isaac 2.03) With Isaac 1.10.10 I get the wind scal...

I have not tried the new firmware. Simplified. Before, we did a 180 degree turn-around tilt cal to get the Newton in level, and a cal ride to get the nose up/down right with the riding tilt factor. On top of this there was this auto-correction algorithm that seems to me "override" both the...

travispape wrote:Send me the ride files and I will take a look: tpape at velocomp

Travis

I'm on Easter vacation for a few days now, but my guess is that you can take any Calride file and find the same issue.

Norbike

There's a Wind scaling difference between Ibike Newton/Isaac 1.0.10, and Isaac 2.01. The cal rides test below was not done in very good wind conditions, but shows Isaac 2.01 get other scaling numbers: Cal ride # ---Newton---Isaac 1.0.10---Isaac 2.01 Cal ride 1. ---0.979-------0.976-----------0.943 C...

Because with Newton+ Isaac can calculate Cda when coasting down a descent. I wanted to enlighten what an error in slope can do with this measurement.

I have a survey measured piece of road, around 200m long with a straight 1.1% slope. (new road, I was the project leader) I often ride this slope when out on my bike. When I start my ride iBike shows me 1.1% slope both ways, but then something happens. I guess it is the 5min auto tilt, because when ...

It’s winter in my country, so I use my Ibike Newton on a MTB now. I have a rigid carbon fork and have little problem with the iBike on MTB. I got around the MTB Crr/Cda question with the Virtual elevation method. I have a pretty aggressive bike setup and got nearly the same Cda as I have on my racin...

When I do wind cals, first I find a flat place that looks pretty wind free. Then I gently place a small plastic transparent plastic bag over the unit and bracket, making sure it’s closed but not tight around the unit or totally closed, so I don’t make a “new atmosphere” around the unit. This way giv...

I am an engineer, working with roads, terrain-modelling and GPS survey. I have access to needed equipment to measure heights and slopes in millimetre accuracy. So, my experience is that the coastdown method is far from accurate enough to measure Cda and Crr. The same conclusion have I made with the ...

Tilt cal and Cal Rides are meant to be done one time...period. If your mount isn't rock-solid tight, then it's possible tilt can shift some, or perhaps the screw is not as firmly attached. In any event, the auto-adjust checks things continuously and makes fine-tuning adjustments during the ride. Th...

Is there any point doing Tilt calibration before a ride, and CalRides (exept for Wind scaling)? Newton auto-adjust tilt within the first 5 minutes of a ride anyway?...If so, which "error" does the auto-tilt function "repair"?..."large" error from a bad til calibration o...

Tried the "new" Cda analysis with Isaac 1.08 Have spend lot of time to get the Wind Scaling correct. 1.05 seems to be the correct number for me. (this is the middle number from 6-8 cal rides, from 0.98 to 1.08) When analyse the CDA from lots of different rides I find this correlation betwe...

Velocomp wrote:2.14 is a typo. 2.13 is a beta and is not yet released. 2.12 is released and addresses the problem discussed in this thread.

I think 2.13 was released last week......?

Is the Riding Tilt calibration affected by this bug?
My Riding Tilt number is lower in 2.11. (From -0.7% to -0.4% avg.)

The tilt seems to respond very slowly in OS 2.11. I rode down a 150m hill with avg slope 14%. Yes, measured slope. (11% 0-50m, 17% 50-100 and 14% 100-150m.) Newton only managed to reach max 9%, and the Isaac shows that the max slope far out on the flat after the hill. (file: At 05:47-06:16) Isaac el...

Wind Scaling bug fixed in OS 2.11 ! No wind Scaling difference between Newton and Isaac, and the wind also displays correct in Isaac now :-) There seems to be a small difference between Newton and Isaac in "Riding tilt" calibration, around 0,1%. Not much. Did 3 Cal Rides today. Results: Is...

Wind Scaling bug fixed in OS 2.11 !
No WS difference between Newton and Isaac, and the wind also displays correct in Isaac now

Thanks for fixing the Wind Scaling bug!

Case closed!
.

Tried the OS2 and Isaac 1.05 update. Still Wind Scaling difference between Newton and Isaac when doing Newton Cal Ride / Isaac Check Calibration. If using the Newton wind scaling, everything gets totally wrong in Isaac....tailwind shows as headwind. Is this a bug in Isaac, or in Newton?... Which fac...

There may be a bug in Isaac. We are looking into this. Any news? . Tried the OS2 and Isaac 1.05 update. Still Wind Scaling difference between Newton and Isaac. If using the Newton wind scaling, everything gets totally wrong in Isaac....tailwind shows as headwind. Is this a bug in Isaac, or in Newto...

Velocomp wrote:There may be a bug in Isaac. We are looking into this.

Any news?
.

Maybe this can be the reason?:
http://www.ibikeforum.com/viewtopic.php?f=55&t=2534

1. Isaac watt calculations: 179.1w + 42.9w + 17.5w = 239.5w. Isaac calculate = 200w. 1.jpg 2. When caclulating these forces separately, they are correct and should be 240w. (without the cm 1.02 factor): 2.jpg 3. Around 240w(+/-) is also what I see in my Newton display. - Don't understand why Isaac c...

My examples was from different ride files. Ride files does not show what I see in the iBike Newton display, so not sure if any point in posting ride files to show the watt difference between Newton vs. Isaac. Also, watt loss in "Advanced stats" seemes to happen in all my ride files in Isaa...

I try to hold constant 350 watt for 60 sec. (manage to stay between 330-365w). iBike Newton shows 342w avg. When I import the ride file to Isaac I get 313watt avg (?!?). I ride for a longer ride trying to hold 250w avg. iBike Newton shows 246w avg. Isaac 213watt (?!?) Hmmm..maybe this have something...

faheyb
Keep this in mind when you are doing coastdown analysis....
http://www.ibikeforum.com/viewtopic.php?f=55&t=2534

There is a trip-meter issue in Ibike Newton. I use metric units, but I guess the same bug can be found in English unit too. The trip meter displays 0.1km when I pass 0.055km. This means 45m error at 0.1km. Test: 72 wheel turns x 2.096m = 151m = iBike 0.1 km 75 wheel turns x 2.096m = 157m = iBike 0.2...

I see this also affects the coastdown process. Did a new Cal Ride today, with coastdowns (because of stem adjustment and autumn clothes collection) The iBike calculate Wind Scaling = 0.912 The Isaac calculate Wind Scaling = 0.745 The 0.745 Wind Scaling is used in the "process calibration ride&q...

I find this issue in all my cal rides, so my guess is that this can be found in other files too. My example: WS 0.725 and aero 0.283 before the cal-ride, and Isaac says WS 0.714 and aero 0.278 after. Cal ride.jpg Then, when I look at my ibike the Ibike shows aero = 0.342. If I extract the numbers fr...

I hope someone can help me which WindScale/aero factor I should use. The one Ibike calculate or the one Iscaac calculate?
(from the same cal-ride)
My question was first posted here, but no response:
http://www.ibikeforum.com/viewtopic.php?f=55&t=2534