I was playing around with autolanding. With more luck than wisdom I found pretty neat landing parameters after 5 consecutive landings. A little overshoot: 7m. The plane should have landed at my feet)
What I did was increase flaps in steps of 10% and decrease minimum airspeed. Moved the landing start point around a bit (not very systematic). I also lowered the flare point from 5 to 3m.
Setup: Ranger 757, ArduPlane 3.5.2, The sonar is an analog Maxbotix. Airspeed is I2C pixhawk. Wind was 3bft. Shifting direction a little.
Now it's nice to be lucky, but it's better to be prepared. :) So, what would you suggest as systematic approach to tune the parameters? I want to tune for:
1. The softest possible landing
2. ... on the shortest possible runway?
How would wind impact the parameters? Does more wind require a steeper descent rate? Or will ardupilot take care of that with more throttle?