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      12-08-2010, 04:50 PM   #1
ShadeD1
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Wipeout on Buzzard's Neck

Not me the e36 in front of me... I shot this at MSR Cresson TX this weekend. The video and overlays were done with my iPhone 4 using Harry's Lap Timer

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      12-08-2010, 05:05 PM   #2
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is that where Motorsports Ranch is being filmed?
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      12-08-2010, 05:10 PM   #3
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Had not heard about that show, but it looks like the same place. I've been going there about 3 years but I'm not a member.

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is that where Motorsports Ranch is being filmed?
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      12-08-2010, 08:40 PM   #4
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Thanks for the vid.
Is that an app on iTunes?
Do you have to start/stop manually, or does it do it via gps?
What mount did you use?
Looks cool.
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      12-08-2010, 09:15 PM   #5
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Harry's Lap timer is an iPhone/iTouch app. It times laps, videos, and overlays gps info. It start and stops itself when it passes a predetermined start point. You download most tracks gps points direct from the iPhone. I'm very happy with it. The only limitations right now is that it only records HD video on the iPhone 4, or SD video on the 3GS, but it will work on any other iPhone as a lap timer. Also, it can only video every other lap but times every lap.
I'm using a RAM suction mount on the windshield.
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      12-09-2010, 01:04 PM   #6
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Is the data collected good enough to compare lines through a particular corner and pick out the fastest way through?

I have been using Trackmaster on Android to do datalogging, and I am pretty happy with it. I did have to buy an external bluetooth GPS so that I could log at 5hz (instead of the 1hz that my phone provided) and get enough data to really see what I was doing at each part of the track.

What rate of data does Harry's capture? Can it also interface with an external GPS?
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      12-14-2010, 12:58 AM   #7
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Quote:
Originally Posted by ShadeD1 View Post
Harry's Lap timer is an iPhone/iTouch app. It times laps, videos, and overlays gps info. It start and stops itself when it passes a predetermined start point. You download most tracks gps points direct from the iPhone. I'm very happy with it. The only limitations right now is that it only records HD video on the iPhone 4, or SD video on the 3GS, but it will work on any other iPhone as a lap timer. Also, it can only video every other lap but times every lap.
I'm using a RAM suction mount on the windshield.
I've had no luck with this app at TWS. Even though the start/finish reference point is defined the app does not pick it up and I end up with one 25 min lap time for the entire session. I'm not that slow...
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      12-17-2010, 08:07 AM   #8
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I saw a couple of people having some issues with the app. It was usually bad placement for the gps but some people said after they rebooted the phone the lap timer started working correctly. Also make sure you don't have both POI sets (CW & CCW) on your phone, it confuses the app. If you don't have an iPhone 4 you really will need an external GPS antenna.

The Data Rate for the GPS is 1khz.
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      12-17-2010, 05:18 PM   #9
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i have harrys laptimer pro too . works like a charm. how did you get the overlays done for ur video? Was that through another software like trackvision or did they update harrys laptimer to overlay the video directly??
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      12-17-2010, 05:28 PM   #10
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If you click on the individual lap times and scroll to the bottom it has an "overlay" button. It takes 3-5 min to overlay the track data to the video. I've been really impressed with the app overall. Not perfect but for 15 bucks you can't go wrong.
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      12-24-2010, 03:30 AM   #11
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Man, that was close. Who were you running with?
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      12-24-2010, 08:26 AM   #12
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The Drivers Edge is the group I usually run with.
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      12-24-2010, 10:15 AM   #13
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Quote:
Originally Posted by ShadeD1 View Post
The Data Rate for the GPS is 1khz.
You must have meant 1Hz for the GPS readings, which is way too low for collecting meaningful information IMO. Its built-in accelerometer might be functioning at 1kHz. I don't own one, so I am speculating...

In general, dedicated data acquisition systems have GPS sensors operating in the 5-20 Hz range. I think vbox has a high end (and expensive) system with a GPS sensor that operates at 100Hz.
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      12-24-2010, 09:56 PM   #14
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Quote:
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The Drivers Edge is the group I usually run with.
Was that the yellow group? I'll be back in Tx next year...maybe I'll see you at an event!
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      12-27-2010, 02:22 PM   #15
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Is there a way to use this app with an external GPS? I have a Bluetooth GPS that gives either 5 or 10Hz, which should be better for comparing lines between laps - wish I could use it with this app.
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      12-27-2010, 02:51 PM   #16
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yup it does have support features for external
gps
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      12-27-2010, 03:04 PM   #17
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Here is the site for GPS Compatibility.

http://web.me.com/hschlangmann/LapTi...atibility.html
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