Antarius wrote:Revelation wrote:MrHMSH wrote:Quick question (not sure it's worthy of its own thread), why does the A330-200 have the taller tail, but the A340-200 not?
Some general suggestions:
1) A330 needs a bigger tail because when it has one engine out it loses half its thrust thus has a lot more yaw, A340 loses only a quarter of its thrust
2) Shorter aircraft need more tail area because the fuselage is shorter so tail provides less torque to counteract yaw
First one definitely applies, not sure about 2nd since I don't know the relative fuselage lengths.
193' vs 195'. So basically identical on length
The length aft of the wings was the same on both 200s. The 300s were the same length, with the 342 being -4 frames between door 2 and the wing (4 windows vs 8 in that first chunk) and -4 frames aft between doors 3 and 4. The A332 was -6/-4, but its taller fin goes further aft, which is why the overall lengths are almost the same. Also, with the 332 activating the center tank, the CG went forward with the inboard engines, so they took more out ahead.
aemoreira1981 wrote:Another question on door arrangement: why did the A332 not have the same door profile as the A342? On the A342, the exits are more or less evenly spaced, while doors 1 and 2 are much closer on the A332.
Ramp rash. The 342 has smaller inboard engines so they don't hit them on the jetway. The larger 330 engines hang further forward, so they moved the door to keep it clear.
Two things that often get overlooked during these discussions:
1. In the early 90s there was the recession after the Gulf War, so a lot of carriers were not buying or canceled, including Continental and Northwest, who had bought several A340s. Without those, the picture would have been much different
2. The 330 and 777 had three engine vendors in a bloodbath, while the single-source 343 had cash-strapped Snecma not wanting to play ball on discounts. This helped tip many deals to the twins.
To address the OP question: the MD-11 had an old wing and a comparatively inefficient layout (tail-engine is worse than a quad): viewtopic.php?f=3&t=1404461