EDIT :wrong slope correction, see my post #32: the following reckoning is wrong
The first version was correct ! ( - Hmmm so the ground-glide has that angle Å | tg Å = tg4°× 115.7/143 Å = 3° 14' ??)
I tried to imagine a very little bit changing the speed of the Ship to absorbe a part of the energy but leaved that idea, thought that I would have to absorbe the thrust at the moment of the trap, and
neglected !
Not only the centerline is going away, but the slope too !
Hmmm so the ground-glide has that angle Å | tg Å = tg4°× 143 / 115.7
Å = 4° 56 ' ??