Orientation of Acceleration Screen

[doloresse1]

Hi Harry,

just a simple question to the orientation of the acceleration screen:
I am using the iPhone 4S IOS 9.3.1 and want to use the laptimer on a bike
in landscape mode.
However the acceleration view does not rotate to landscape anyway.
Timer view does, as well as the other views.
But acceleration view stays in portrait mode,
if i twist the phone to 180 degrees, the orientation adapts (but for portrait only).


On the right low corner there are some small icons. One of them seems to state the portrait mode,
but there is not the icon for landscape format in the acceleration view, as this is shown in the timer view.


I found no information in this forum - sorry if I missed one - but can you help me?

kind regards

r

[Harry]

Acceleration View is available in portrait only. Digital displays of lateral / longitudinal and overall acceleration are available in some other views (GPS and Timer) supporting landscape.

Harry

[doloresse1]

Hello Harry,

two things first:

Thanks for your quick reply - understood! and:
Used the laptimer yesterday forthe first time. Definitely a well designed app, no crashes, good user-experienced ->> phantastic!
One of the best Apps I own.

Regarding the acceleration: I am using petrolhead on my bike in landscape orientation.
I wonder about the calibration procedure which demands a portrait orientation for calibration.
So at last, after some trials, I skipped the calibration.
But I wonder I the acceleration data in the result do have the right direction. On a bike I would expect
more "längsrichtung" acceleration than a "querrichtung" (sorry - I do not know the right englisch word), but
the result qraph does not meet my expectation. I am a little bit confused - can you help me?

And a last short question:
When I user the iphone for data-aquisition: can I review my data on an ipad? How to move the data to the second app on the ipad?

And now really the last question regaring reading the round graphics:
Can I get an explanation about the symbols (triangles), the colors and the numbers?

thanks for your great app and your support!

randy

PS: On Pannoniaring lots of guys were interested in your app

[Harry]

For motorbikes it is best to use the motorbike acceleration preset (see the animated illustration #4 in Quick Reference). To make sure it has the correct tilt angle, check lateral and longitudinal acceleration are around zero when sitting on your bike while in the pits.

I am not sure you get as high longitudinal acceleration for a motorbike as lateral acceleration. Please remember - highest overall acceleration is defined by your tire's grip. When accelerating, you have only one tire providing all the grip. It will get a lot if load and developed a lot of grip, but two tires equally loaded in a bend are probably still better. The ratio will be different compared to cars, but the general rule lateral is higher than longitudinal will still be correct?

To transfer data to your iPad: select any lap from the session to analyze from Lap List. Press Export and select Session as scope and .hlptrl as file type. Send the export mail to an email address you can read on the iPad. Once it arrives, touch the attachment in Mail and select LapTimer to open it.

For the symbols, please post a snapshot and I will comment.

Harry

[doloresse1]

Hallo Harry,

just to make clear: longitudinal acceleration = Längsbeschleunigung and lateral acceleation = querbeschleunigung.
On a Motorbike there is (almost) no lateral acceleration as this is compensated via the lean angle (compare to a car).
Even Bikes have just one tyre, the longitudinal accelerations is most likely higher than any car (except extrem racing cars).
E.g. my Bike has 140 horsepower and needs about 3,5 second from 0 to 100 km/h (because of the low weight compared to a car).
I own an old Porsche 964 with 250 hp, which needs (in best case) 5,7 seconds for this acceleration (with double 255/17 tyres) and
thats defenitely a good result.

So for bikes I would expect longitudinal acceleration only. And in curves regarding the lean agles more momentum onto the bottom of the bike (iPhone), i.e. downwards. But not lateral. Do you agree to my argumentation?

And secondly: I want to have my iPhone places in landscape position and also with a flat angle (because of wind-power and mirroring the heaven.
I could submit a photo to make it easier to reproduce. So the portrait calibration seems senseless, does it?

Snapshot I will do and thanks for your comments in advance.



Nevertheless: I am really impressed of your app, great implementation! So my concerns are on a high quality level and are meant constructive.

kind regards

randy

[Harry]

Lateral acceleration is zero in the direction of lean. It is not zero for the bike in direction of gravity! What LapTimer does to measure lateral acceleration (gravity oriented) for motorbikes, is measuring downforce.

On the other item: I'm not arguing a motorbike will usually accelerate better than a car and will be slower in corners ("The ratio will be different compared to cars"). What I said is lateral acceleration will probably still be higher than longitudinal because you utilize two tires instead of mostly one.

A flat position is not supported by LapTimer, neither using the preset or individual calibration. For non-flat situations, you can calibrate the phone in portrait, lock calibration, and rotate to landscape afterwards. This is handled correctly. Please check the Acceleration Handling document available on http://www.gps-laptimer.de/documentation.

And keep in mind, you can calculate lateral acceleration and lean from GPS too.

- Harry

[doloresse1]

Hi Harry,

all understood.
Reading your doc a second time helped. So for bikes there is only one kind of Mount possible - > flag and Portrait.
Then the measurements of acceleration (lateral via downforce and longitudinal) should be ok. I will try on 18th May

Attached the Screenshot of my iphone

IMG_2766.PNG (92.98 KiB) Viewed 3270 times

.
May I ask you to comment the triangles, the Colors and th numbers?
(Maybe according a wrong Mount (landscape flat) the content is a mess, but in principle I´d like to know the meaning of
Ccolors and symbols.
Thanks for contribution.


Randy

[Harry]

When selecting Map (Karte), the default is to show the lap recorded with lateral acceleration as colored annotation. Green means below 0.95G, yellow between 0.95G and 1.15G and red above 1.15G. Thresholds can be adjusted in LapTimer ‣ Administration ‣ Settings ‣ Expert Settings ‣ Acceleration Colors (Android and iOS) and in the configuration dialog available using the small tool in the top left (iOS). They should be set specific for your motorbike in a way green means "too slow", yellow means "in the range expected" and red "too fast, take care".

Map has other options which can be switched to by pressing the small tool in the top left: longitudinal acceleration (to see brake and acceleration points), accuracy and lap by lap comparison.

The speeds shown are min and max speeds achieved. Min speeds are typically reached in corners, and max speed on straights. As an example the bottom most 164 km/h means you reached 164 km/h on this straight before you reduced the throttle / hit brake.

- Harry

[doloresse1]

Impressive!


Kind regards

Randy