SIM Hit ground at 0.474583m/s

ArduCopter Copter 4.0
1

When I am running SITL, the Copter successfully landed, and the message show" Hit ground at 0.474583m/s". I wonder what is the safe landing speed. Less 0.5m/s?

2

I think it is not a kind of message you should care about, it is displayed at each lauching at SITL… It is not a warning or alike.

3

However, sometimes the Hit ground speed >10m/s. I think it’s a crash.

4

Sorry, I have never experienced this…