unmanned transport,
Are you sure the A380 can be twinned? They tried to do that with the 747, but it would fail engine out thrust requirements. In other words in could not stay in the air with just the one engine. I doubt the A380 could either unless that engine could be over thrusted to produce 1.5 times it's rated thrust.
always-pending, you have more than enough here to figure it out like some already have.
It has nothing to do with the tail.
