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B737-700 Series Tail Shape  
User currently offlinecelestar From Singapore, joined Jul 2001, 398 posts, RR: 0
Posted (1 year 4 months 1 week 5 days 16 hours ago) and read 3428 times:

Boeing has done a great job at stretching the basic design of B737.
I was looking at the latest 737 family that are currently in service, the B737-800 and 900 series look proportionally correct, however, when I look at the -700 or -500 series, I can't help but think how disproportionally big the tail fin is! It looks way too big for the size of the fuselage. If you look at the AIRBUS A320 family, from A318/319/320/321, at least to the nake eyes, the tail fin is roughly about the same size, given the different length of the fuselarge. Question, why B737-500/700 series have such a large tail? Isn't that induces drag? Is there a reason, aside from commonality of parts (which I find that to be difficult to believe), that the tail fin has to be that big? I do see on the 747-SP tail vs regular 747-300/200/100, it is bigger in size, not to mention the SP has a different wing. Please shed some light. Thanks all.

9 replies: All unread, jump to last
 
User currently offlinetravelavnut From Netherlands, joined May 2010, 1607 posts, RR: 7
Reply 1, posted (1 year 4 months 1 week 5 days 16 hours ago) and read 3421 times:

Because of the short fuselage the tail fin has less authority, that's why it has to be bigger on shorter aircraft, especially in an engine-out scenario.


Live From Amsterdam!
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17017 posts, RR: 67
Reply 2, posted (1 year 4 months 1 week 5 days 16 hours ago) and read 3404 times:

As travelavnut says.

For a similar reason the 330-200/300 has a taller fin than the 340-200/300. It's all about engine out rudder authority.

Quoting celestar (Thread starter):
If you look at the AIRBUS A320 family, from A318/319/320/321, at least to the nake eyes, the tail fin is roughly about the same size, given the different length of the fuselarge.

The 318 has a tail that is 76cm taller than the 319 and 80cm taller than the 320/321.

Quoting celestar (Thread starter):
I do see on the 747-SP tail vs regular 747-300/200/100, it is bigger in size, not to mention the SP has a different wing.

If memory serves, the wing is the same apart from simpler flaps.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlinePolot From United States of America, joined Jul 2011, 2158 posts, RR: 1
Reply 3, posted (1 year 4 months 1 week 5 days 9 hours ago) and read 3316 times:

I thought the tail on the -700 was the same as the -800/900 (not sure about the -500 vs the rest of the classics or the -600). It just look larger because the fuselage is proportionally shorter (unlike the A318, which actually has a larger tail then the rest of its family).

User currently offlineAA737-823 From United States of America, joined Mar 2000, 5767 posts, RR: 11
Reply 4, posted (1 year 4 months 1 week 5 days 3 hours ago) and read 3173 times:

Quoting Polot (Reply 3):
I thought the tail on the -700 was the same as the -800/900

Indeed it is.

But it can't be made smaller than the -8/-9, because of the decreased moment arm on the shorter airplanes.


User currently offlineViscount724 From Switzerland, joined Oct 2006, 25117 posts, RR: 22
Reply 5, posted (1 year 4 months 1 week 5 days 2 hours ago) and read 3135 times:

Quoting Polot (Reply 3):
I thought the tail on the -700 was the same as the -800/900

The size of the vertical stabilizer on all 737NG models from the -600 to the -900 is identical. If memory correct it's about 5 feet taller than on the classic models.

[Edited 2013-04-12 16:06:46]

User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 6, posted (1 year 4 months 1 week 4 days 14 hours ago) and read 2997 times:

Quoting Polot (Reply 3):
I thought the tail on the -700 was the same as the -800/900

Isn't that a fact.......All were part of the B737NG series.I thought they were all the same.



Think of the brighter side!
User currently offlineLH707330 From United States of America, joined Jun 2012, 748 posts, RR: 0
Reply 7, posted (1 year 4 months 1 week 4 days 6 hours ago) and read 2903 times:

Quoting Starlionblue (Reply 2):
For a similar reason the 330-200/300 has a taller fin than the 340-200/300. It's all about engine out rudder authority.

The 330/340s have 3 fins:
Short fin: 343, 333, 342
Tall fin: early 332
Medium height/longer chord fin: 345, 346, later 332s

Quoting Starlionblue (Reply 2):
The 318 has a tail that is 76cm taller than the 319 and 80cm taller than the 320/321.

I thought the 319/320/321 are all the same, the 318 being the oddball. Are you sure you're not quoting ground clearance?


User currently offlineViscount724 From Switzerland, joined Oct 2006, 25117 posts, RR: 22
Reply 8, posted (1 year 4 months 1 week 4 days 2 hours ago) and read 2854 times:

Quoting LH707330 (Reply 7):
Quoting Starlionblue (Reply 2):
The 318 has a tail that is 76cm taller than the 319 and 80cm taller than the 320/321.

I thought the 319/320/321 are all the same, the 318 being the oddball. Are you sure you're not quoting ground clearance?

As far as I know the vertical stabilizers on the 319/320/321 are identical.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17017 posts, RR: 67
Reply 9, posted (1 year 4 months 1 week 4 days ago) and read 2802 times:

Quoting LH707330 (Reply 7):
Quoting Starlionblue (Reply 2):
The 318 has a tail that is 76cm taller than the 319 and 80cm taller than the 320/321.

I thought the 319/320/321 are all the same, the 318 being the oddball. Are you sure you're not quoting ground clearance?

I stand corrected. I just read height from the a.nut info pages so obviously ground clearance counts.



"There are no stupid questions, but there are a lot of inquisitive idiots."
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