"You are rising the question of latency but, (I'm not a linux specialist) to my knowledge the linux kernel offers realtime capabilities. Isn't the ar.drone running on linux ?"

"I have one question : I don't quite understand the interactions between the px4 autopilot project and the Pixhawk one. When I look at the pixHawk project, I see that the hardware used is different to the px4 autopilot and is not using an RTOS.…"

"Nice ! Is it running the nuttx rtos based software ?"

"I think that's what all other potential buyers inluding me are waiting for ..."

"Thanks for your answer, I also very much appreciate the whole system architecture. I think I'll wait to see something flying for real before I get it. The architecture looks very promissing but the nuttx RTOS seems to be very new and not that…"

"This question is probably a bit out of place but can someone tell me what is going on with the code side of the px4 project ?"

"I don't underdand why these frequencies are the only ones acceptable. I see that N1 & N2 are limited to a few values but can't you set M (PLLFBDbits.PLLDIV) to get,say 80Mhz ?"

"Thanks for your answers !   But then, why not selling the UDB with a bootloader already installed ?  "

"I'm trying to load the code with PicKit2. I use pickit2 as standalone with the pickit2 associated software. I connect the board with the triangle on the pickit2 facing the dash on the UDB4, power it with external 5 volt power source. After…"

"Thanks Bill !"

"I just ordered a udb4 board. I've installed mplab along with the c30 compiler evaluatation version on two differents computers. When I try to compile the matrixpilotV3.2 for udb4 I get the same error on both computers…"

"Can someone tell me wether picKit2 would be ok to program it ?"

"Hi Doug, To compute the angle of attack pitch is not really needed unless use in conjuction with vertical velocity and airspeed. What is really important though is airspeed, mass and Acceleration. The formula that links the lift, threrefore Z…"

"Hi Tom, You should disassociate rotation and Euler angles. Euler angles are state parameters more commonly known as pitch roll and yaw whereas rotation is the state transition that describes how the state (euler angles) change ( how the plane…"

"Hi Gilles, Thanks for your help !"

"You have to set the right baud rate. Otherwise on some terminal you will see the strange caracters. As an example mine runs at 38 400 bauds default settings. But as I Asked above, I don't know you to change settings on the GPS... By the WAY,…"