celestar
Topic Author
Posts: 494
Joined: Mon Jul 09, 2001 11:37 am

B737-700 Series Tail Shape

Fri Apr 12, 2013 8:26 am

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.
 
travelavnut
Posts: 1327
Joined: Wed May 12, 2010 1:35 pm

RE: B737-700 Series Tail Shape

Fri Apr 12, 2013 8:35 am

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 avatar
Starlionblue
Posts: 17053
Joined: Fri Feb 27, 2004 9:54 pm

RE: B737-700 Series Tail Shape

Fri Apr 12, 2013 9:01 am

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." - John Ringo
 
User avatar
Polot
Posts: 4587
Joined: Thu Jul 28, 2011 3:01 pm

RE: B737-700 Series Tail Shape

Fri Apr 12, 2013 3:29 pm

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).
 
AA737-823
Posts: 4888
Joined: Wed Mar 01, 2000 11:10 am

RE: B737-700 Series Tail Shape

Fri Apr 12, 2013 9:21 pm

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.
 
Viscount724
Posts: 18838
Joined: Thu Oct 12, 2006 7:32 pm

RE: B737-700 Series Tail Shape

Fri Apr 12, 2013 11:02 pm

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 avatar
HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: B737-700 Series Tail Shape

Sat Apr 13, 2013 10:56 am

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.
I may not win often, but I damn well never lose!!! ;)
 
LH707330
Posts: 1491
Joined: Fri Jun 15, 2012 11:27 pm

RE: B737-700 Series Tail Shape

Sat Apr 13, 2013 6:35 pm

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?
 
Viscount724
Posts: 18838
Joined: Thu Oct 12, 2006 7:32 pm

RE: B737-700 Series Tail Shape

Sat Apr 13, 2013 10:20 pm

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 avatar
Starlionblue
Posts: 17053
Joined: Fri Feb 27, 2004 9:54 pm

RE: B737-700 Series Tail Shape

Sun Apr 14, 2013 1:08 am

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." - John Ringo

Who is online

Users browsing this forum: No registered users and 29 guests