"The lift is not produced because your battery voltage drops too low under load.
As Gustav said the motors require more current than the batteries can deliver, so the voltage drops, and the motors spin too slowly, hence not enough lift.
To use those…"
"A common thing with the XBee is to 'brick' them, especially if you don't have the pram Telem_Delay set to 3 or more.
If you search for fixing a bricked XBee you will find the formula.It just involves using x-ctu and forcing a reload…"
"In your 'Flight Data' window (it might work anywhere else too) press 'ctrl-F' and hidden window will appear (why it's hidden is beyond me).
In that window you will find a button 'Geo ref images'.
That will bring up…"
"GCS - Ground Control Station
FW - Firmware
If you ever have troubles with a board one of the first things to do is reload the latest firmware.
You will do this from your Ground Control Station being something like APM Planner or Mission Planner…"
"It means exactly what it says.
The Gyros are not healthy.
I once bought a HK clone and it came up with that message.
If you left it sitting while plugged into the GCS, the artificial horizon would move on it's own. Slowly at first but…"
"Both those 2 things : Obstacle avoidance no1 and Optical Flow with distance awareness would be no2.
More than 2 units per machine, ie: forward AND down.
Ability to feed stereo vision to video goggles for 3D FPV.
my 2 "