"This documentation should get you started: http://www.tuffwing.com/support/UAV_Mapper_Parachute_Installation.html
This might get it down in one piece: http://www.marsparachutes.com/mars-58/

-Brian"

"Hi Rafael,
It's ready to go: http://www.tuffwing.com/support/Install_a_canon_precision_geotag_ca...
-Brian
Rafael said:
Hi Brian, any guide anywhere to make that phototransistor and install it on the pixhawk? Brian Christal said:
For Canon…"

"In my case above it was a poorly trimmed airplane. As an old RC guy who learned on sailplanes I always trim so the nose slightly falls. I fly with back pressure on  the stick. Not a good idea with a Pixhawk. Trim your plane in Manual mode so it…"

"Use Pix4D to georeference your images. It's much more accurate. You must use time offset in mission planner if you have a an uneven amount of CAM messages and images."

"Can you see PWM commands in the log? The plane is still intact after the crash. It is a flying wing. Both elevon servos and control linkages are good. Seems like something was lost between Pixhawk Desired Pitch Up and the servo. Also, since it's a…"

"The plane crashed in a field and rested over night with power on. Amazingly the lipo powered without completely discharging and damaging the battery. The Log file was 389 MB so I deleted the part where the plane was just sitting. The plane was still…"

"Thank you Andre for the excellent analysis. I suspected mechanical failure. Please help me understand how you see the uncommanded roll in the log?
Thanks!
Brian"

"I've used analog air speed sensors on two different planes with Pixhawks. They work perfect. I sacrificed an I2C cable by cutting off the 4th pin. Then followed the instructions here: http://plane.ardupilot.com/wiki/airspeed/#analog_airspeed_sensor…"

"Looks like a low battery to me. There's a battery failsafe at 6.5 minutes. The copter flies for another 5 minutes. The voltage momentarily goes be low 10 volts. Many ESCs are programmed to stop if voltage goes below 3.3 volts per cell. 9.9 volts.…"

"Hi Plinio,
Yes, sort of. There is a beta version of the KAP UAV script that lights the red eye lamp when the shutter opens. I'm working a cable now that uses a phototransistor to read the lamp and send a feedback signal to the Pixhawk. But, the…"

"Chasing the camera delay from CAM trigger message to shutter open is futile. Feedback from the camera to the autopilot is required. It's being addressed here:
https://github.com/diydrones/ardupilot/issues/2289…"

"For Canon Powershots...

I've been working with working with the KAPUAV script guy. http://chdk.setepontos.com/index.php?topic=12398.0
He has modified the script so it flashes the Assist focus LED on on shutter open. I'm in the process of modifying…"