Indeed, its all about directional stability.
In the air speed = momentum = stability.
On the ground directional stability comes from having the wheels firmly on the ground.
So touching down firmly with a bit of extra speed gets you through the vulnerable bit as quickly as possible. But not enough speed to make it float in ground effect.
All STOL types have this vulnerability due to their low touchdown speed.
Last edited by The Ancient Geek; 15th Apr 2017 at 19:51.