No que diz respeito às especificações técnicas, algumas explicações são:
Trecho de Wikipedia (a formatação é minha):
T-tail
DESIGN: The horizontal stabilizer is mounted on top of the fin, creating a "T" shape when viewed from the front.
PURPOSE:
- T-tails keep the stabilizers out of the engine wake, and give better pitch control.
- T-tails have a good glide ratio, and are more efficient on low speed aircraft.
- However, T-tails are more likely to enter a deep stall, and are more difficult to recover from a spin.
T-tails must be stronger, and therefore heavier than conventional tails. T-tails also have a larger radar cross section.
Cruciform tail
DESIGN: The horizontal stabilizers are placed midway up the vertical stabilizer, giving the appearance of a cross when viewed from the front.
PURPOSE: Cruciform tails are often used to keep the horizontal stabilizers out of the engine wake, while avoiding many of the disadvantages of a T-tail.
Em referência à sua comparação entre o ATR 42/72 com o Boeing 727, se tirarmos a diferença nas alturas de cauda (ATR 42: 24 '11 "; ATR 72: 25' B727: a posição do estabilizador horizontal no estabilizador vertical é quase a mesma nestes três aviões. em vez de uma cruciforme.