This app uses the accelerometer on your phone to act as a lap timer.
It records laps and final race stats to use with RC cars. I haven't used it on other courses but just use your imagination.
The way I tested it was to put it over a soft car board that is a ramp on my track representing the start line. When the car crosses the finish line it records the lap time.
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There is now available a version for iPhone/iPad on the app store. For now it is somewhat different as it doesn't use the accelerometer to count laps. Instead the user counts laps using buttons but it is possible to time 4 racers at the same time.
Find it here:
Tags: race cars timer , rc audio timer , rc maeket race games , rc car lap timing , timingbeam – rc lap timing , rc race timer tracker , rc race timer , auto race timer , best rc lap timer