Tuesday, October 23, 2012

Fun with My Tracks app in the Piet

I've been playing around with the Droid app My Tracks, which records your every move by GPS. Took it for a ride in the Piet. Here is the track on Google Maps (http://goo.gl/maps/uaG6g):



The red teardrop points to the hangar at Lenora. I was testing the newly-installed mixture control on the newly-installed Marvel-Schebler carb, so after lift-off I did a lazy rectangle around the reservoir. I then did a run down to see if there were any families visiting the maze. The track for this is the skinny arm with loop to the right. Here's a close-up from Google Maps:


The satellite must have photographed last year's maze, which was a Coca-Cola bottle. This year was a tribute to Chipper Jones, the retiring 3rd baseman for the Atlanta braves. I took some photos; this is one that turned out OK:


My Tracks also collected altitude data and plots it against time or horizontal distance. I haven't figured out how to send the plot (or even the raw data) from the phone to a computer, so I don't show it here. However, from the plot, as near as I can tell, the rate of climb from lift-off to 2500 MSL was 850 fpm. I wasn't pushing at all, the IAS was about 65 mph and we are pretty sure that 55-60 mph provides best ROC. Not bad for an old Pietenpol.

Thanks to Mike for helping with the carb installation and to Mike, Wayne, and Wes for help in the mixture control. Note to Mark: See? No overshoot on the turn from base to final!