5LY
For the same reason that the rudder is ineffective, the elevator is ineffective.
There is initially very little airflow or even worse reverse airflow with a tailwind, and the rudder would be becoming usefully effective at about the same time as the elevator.
In the tailwind case, if I actually believed that the stab has any effect at low speed in the initial accel, which I don't, it would be the opposite of what is wanted! Until gnd speed at least equals tailwind, the negligible lift it is producing is working against holding the nosewheel down.
That's why I asked the question. Both rudder and elevator/horizontal stab require positive and significant airflow to have any effect. Try taxiing at 30kts and pull full back. Does the nose rise majestically??
I think not.
I will possibly accept that something usefully aerodynamic is starting to happen IAS >50kts, but that is also the case with a tailwind, obviously, so why the difference in procedures.
Is this left over from old prop-wash aircraft?!
So why do we do it?