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Tall Tails/Short Tails  
User currently offlineRapo From United States of America, joined Sep 1999, 395 posts, RR: 0
Posted (14 years 5 months 1 week 3 days 23 hours ago) and read 930 times:

The Boeing 747SP has a taller tail than that of other 747's. The A330-200 has a taller tail than an A330-300. What is the effect of having a taller tail on a shorter plane? One would think that to obtain the same turn rate in a longer plane (ingnoring the ailerons), more surface area would be needed at the tail. But, exactly the opposite seems to be true. Can anyone explain these "tall tales"?

2 replies: All unread, jump to last
User currently offlineA320FO From Austria, joined Oct 2000, 211 posts, RR: 1
Reply 1, posted (14 years 5 months 1 week 3 days 22 hours ago) and read 919 times:

The size of the tail has a different reason. It has to do with the controllability of an airplane during a one-sided thrust loss (engine failure case). A longer fuselage needs a greater turning moment, increasing directional stability. Now the same plane with a shorter fuselage has to compensate this loss in stability. That is done with the larger tail surface. On the A321-A319 a one-sized tail is sufficient, but on the A318 it will be heightened by several feet.
Just a basic explanation.


User currently offlineRapo From United States of America, joined Sep 1999, 395 posts, RR: 0
Reply 2, posted (14 years 5 months 1 week 3 days 21 hours ago) and read 905 times:

Ahh, I didn't even think of that. Thanks for the explanation.


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