Jean, your half rite.
I didnt mention roll, coz theyd be identical, but in pitch, there would be a noticable difference.
Wot youd call " much the same" is wot id call " noticable difference".
As for the yaw, the same applise.
You say "I do not know if it is really necessary to have a powerful rudder."
Well, maybe so, but its essemtial for wot im do'n.
And its not just the distance from prop to rudder and the length of the machine, but also, if you stomp on the rudder of a long tractor, the tail will very quickly be out of the prop blast, coz the prop blast wont instantly follow the yaw of the machine. The fastest a tracter could yaw is dependant on how fast the prop blast catches up.
The pusher OTOH will have the rudder in the prop blast no matter how fast you yaw the machine.