Re: T-tail aircraft
The Tee does have an "end cap" effect and I believe that (discounting any top fairing) cutting down the number of roots fillets to two from four in the cruciform conventional tail is beneficial in drag terms or is that saying the same thing twice but in a different way? Having rear engines is a bit of a pity having to add structural strength exactly where the designer was hoping to finish off with a light touch. The rear-engined conventional tail jobs might have had more to do with stick shaker controversy and, poisonous thought, if someone comes across with a thoroughly bad attitude why not let the interview board in on the secret too. After all, once you can fake sincerity the world is your bottom feeding bivalve. Only half-kidding.
Tea break's over, back on yer heads
the "E"