Search found 798 matches

by gplracerx
Wed Feb 14, 2018 3:37 pm
Forum: Using LapTimer
Topic: Yaw Rate Chart
Replies: 21
Views: 3143

Re: Yaw Rate Chart

The readings will still be valid for the vehicle frame of reference. But at high yaw angles, they won't look the same as values calculated from GPS data in the Earth frame, assuming your GPS antenna is reasonably close to the center of mass of your car. In theory you could calculate the yaw angle fr...
by gplracerx
Tue Feb 13, 2018 3:44 pm
Forum: Using LapTimer
Topic: Yaw Rate Chart
Replies: 21
Views: 3143

Re: Yaw Rate Chart

I am digging out the venerable thread after a splendind morning sliding around on an icy AX track this morning. If there is a lot of drifting, handbrake U-turns involved, should I use GPS-based acceleration data to compute the yaw rate? I am using a 20hz GPS with a consistent 0.77 HDOP (3m accuracy...
by gplracerx
Sun Feb 11, 2018 4:13 pm
Forum: Using LapTimer
Topic: Using for Off Road Dirt Bike Racing?
Replies: 4
Views: 251

Re: Using for Off Road Dirt Bike Racing?

Autosport Labs RaceCapture Pro and Apex have telemetry capability, assuming there's the right kind of cellphone service available at the track. The data are uploaded in real time to a web site. I don't know how well it actually works, though. They also need power from an external source, either 12V ...
by gplracerx
Fri Feb 09, 2018 5:39 pm
Forum: Using LapTimer
Topic: Exporting A Session with All Lap Data
Replies: 5
Views: 194

Re: Exporting A Session with All Lap Data

If you can't remember which name is which, check the file size and open the larger one.
by gplracerx
Mon Nov 27, 2017 8:37 am
Forum: Using LapTimer
Topic: Ideal time to Stop Race Recording
Replies: 1
Views: 171

Re: Ideal time to Stop Race Recording

Cancel should only delete the whole session if the laps weren't split. But you should be able to determine that by whether you see lap times or not. However, I would rather edit the lap list rather than run the risk of losing data.
by gplracerx
Sat Sep 16, 2017 7:05 pm
Forum: Trouble Shooting
Topic: HLT Petrolhead to GP Edition troubleshooting
Replies: 2
Views: 269

Re: HLT Petrolhead to GP Edition troubleshooting

If you searched on this forum you likely would have found the answer as it comes up often.

Load the Petrolhead edition on your iPhone 5. Then open HLT and upgrade to Grand Prix through the in app purchase. As long as you're using the same Apple id you used to buy the upgrade, you won't be charged.
by gplracerx
Fri Sep 15, 2017 4:19 pm
Forum: Trouble Shooting
Topic: Hero 3+ and Itunes 12.7
Replies: 6
Views: 499

Re: Hero 3+ and Itunes 12.7

Buy the Apple Lightning to SD Card Camera reader. You'll need the micro-SD to SD adapter that should have come with your micro-SD card. That will transfer video files from the SD card to the Photo app. That can be accessed from Laptimer. That's really the fastest and most convenient way to transfer ...
by gplracerx
Fri Sep 01, 2017 1:27 am
Forum: Trouble Shooting
Topic: Incomplete Lap Recordings
Replies: 32
Views: 3026

Re: Incomplete Lap Recordings

cobbyboy, You might also try exporting unsplit lap data in .kml format and opening it in Google Earth to see if there is some glaring error in the GPS data, like it thinks you went into the paddock. After you widen the corridor, first send the program to the background and open it up again, then ope...
by gplracerx
Wed Aug 23, 2017 10:34 pm
Forum: Trouble Shooting
Topic: Camera Stabilization
Replies: 6
Views: 733

Re: Camera Stabilization

The front camera is lower resolution and has a fixed focal length. Autofocus is one of the contributors to the problem. What with vibration, the camera can't decide where it needs to focus. If you could turn it off, it would help. But Apple and Android operating systems take turning autofocus off as...
by gplracerx
Sat Aug 19, 2017 12:31 am
Forum: Announcements
Topic: "Wivel" crowd funding live
Replies: 18
Views: 2614

Re: "Wivel" crowd funding live

Blackfrosch wrote:The units are in production. And obviously 50hz is marketing, but I believe that wivel will work great with harrys laptimer - so no need to connect ,three sensors


Then how come they're not for sale? And they've been 'in production' for about a year now.

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