I flew in wind I knew was a bit too much today and learned some things about the phantom firmware. Losing battery power to my fpv didn't help. I really thought I'd lost my p2 non-vision. My initial reaction to losing the power to my screen was to power off the tx to initiate RTH. Id already found that In RTH only limited stick input by the autopilot is applied by the naza. Can I call this limited input X. The wind was too strong for X to overcome the wind so the phantom drifted. It seems that iIf RTH is initiated, the phantom will try to hover in its current GPS position before initiating RTH. If it cannot achieve this with X, it will just try to get back to the position it got lost until it can. It will not climb to 66ft nor re-oreint itself to home until it can hover where tx was lost. If the wind overcomes X, the phantom will not add more stick input. So unless the wind drops, the remaining battery power is all that will keep it in the air. I switched the tx back on, selected atti and HL and added full aft stick, the phantom eventually came into view. I switched the transmitter off again to try and re-initiate RTH. I found if the phantom does manage to arrive over the home point, it will not descend until it manages to hover for a time at this location using the maximum stick deflection X. If the wind does not subside, it will not descend. Manual landing is necessary f the phantom cannot manage a hover over the registered home point using the limited stick deflection X. I reckon, and this s just gut feeling of wind speed that (1) is no more than 18mph wind speed.