|Quoting Speedracer1407 (Reply 2):
I thought that, as a general rule, shorter planes required larger rudders (donno about H-stabs) to complensate for the shorter moment arm.
Correct as a general rule. For a good example, check out the 747SP.
However, the 340-500/-600 are not only longer, they also have larger wings and more powerful engines than the 340-200/-300. So they need more control authority beyond that gained by the greater moment arm.Thus, they borrow the empennage from the 330-200/300/8000. This empennage is larger than on the 340-200/300.
|Quoting Vikkyvik (Reply 3):
I believe, for instance, that the A330-200 has larger vertical and horizontal stabs than the -300.
I don't think so. But I may be wrong. However as I said above the 330 empennage is larger than the 340Classic empennage due to greater control authority required in an engine out situation. Compare one engine out of two with one engine out of four.
[Edited 2006-08-24 04:19:33]
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo