klm744
Posts: 109
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How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 2:53 am

When it comes to 737's I can easily differentiate between a 737-200(because of the engines) and a 738 and 739 (they are much longer than the others), but I was wondering if there is a way to tell the difference between the ones in between the 732 and 738/739 such as the 733 and 735 etc purely by looking at their outside appearance. I often see 737s when spotting and would like to be able to tell what model it is. By the same token does is there a way to tell the difference between the various md-80s barring the dc-9 and 717 which are easily identifiable. Thanks.
 
mika
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 3:17 am

It's all about the length ain't it? correct me if i'm wrong.
 
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yyz717
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 3:20 am

Line up some pics of the 733/734/735.....you'll see the difference...then as you become familiar with the lengths, you'll be able to ID one easily.

The 736 and 737 (-700) have similar length to the 735 & 733 respectively...but with a much larger tail....indeed the 736 tail looks too damn big. Indeed, out of proportion to me.

Another way to differentiate is to know which airlines fly which.

Neil/Toronto


I dumped at the gybe mark in strong winds when I looked up at a Porter Q400 on finals. Can't stop spotting.
 
777guy
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 3:21 am

Inthe case of the -500, it is a -200 with the newer engines.
 
donder10
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 3:24 am

The engines on the 737-200 are very long and thin and almost look like submarine models!
 
boeingmd82
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 3:34 am

The B737-300 and B737-600NG look almost the same length, the tails are a good way to tell them apart as mentioned above. A good way to tell the difference between the "Classic" 737s and the "Next Gen" is that the engine nacelles are not as "squished" on the Next Gens as on the Classics. The longer legs of the Next Gen allows a rounder intake because of better ground clearance.

When it comes to the MD-80 variants, it's almost impossible to tell many apart because the changes are not external from model to model.

The MD-90 is pretty easy to spot, due to it's long skinny body and huge tail-mounted V2500 engines.
 
timz
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 5:50 am

Might as well go to boeing.com (or airliners.net?) and see how long each of the 737s are. Take a look at airliners.net photos and compare window counts on the 737s; the -400/-800/-900 have two overwing exits each side, the other 737s have one.
Viewed from the front the -700/-800/-900 lack the landing lights beneath the wing, on the flap tracks (though that's no help if the flaps are retracted). The bottom of the nacelle is more flattened on the -300/-400/-500 than on the later ones, but it's not a glaring difference. The big difference between the -600/-700/-800/-900 and earlier ones is the wingspan.

MD81/82/83/88 are externally identical AFAIK; the MD87 is of course shorter, and it's the only MD80 that has that extra bit of metal at the top of the fin, above the tailplane.
 
Guest

RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 5:52 am

733 - Flat engine bottoms, 1 overwing exit door.
734 - Flat engines, 2 overwing exit doors.
735 - Round engines, 1 overwing exit door.
 
dutchjet
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 7:09 am

Regarding the 732, its easy because of the long JT8D engines.

Concering the 733/734/735: if it has 2 overwing exits, its a 734, I can distinguish the 733 from the 735 by counting the number of window between the foward door and the windowless airframe a bit before the wing, the 735 has less windows as it is shorter (the 735 is approx the length of the 732).

On to the 736/73G/738/739, its all a matter of length, the new family has the larger tail, as stated above, the 736 is similiar in size to the 735 and the 73G is the same as the 733, so the window count approach works (also there are very few 736s around so its easy), the 738 and 739 are simply much longer.

Concerning the MD80, its hard since the 81/82/83 are all the same externally and just about the same as the 88, the MD87 is shorter. The thing with the MD80 series is the tail cones, some aircraft have flat cones and other have the pointed ones, and it seems to be quite random, depending on when the aircraft was manufactured or it is was retrofitted, and not which type.

I thought this was as easy question: what is the difference between a 737 and an MD80 - just kidding, regards.
 
IMissPiedmont
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 7:55 am

The 737NGs have the pitot tube and AOA vane that used to be located directly under the cockpit window moved forward several feet. Almost to the radome. Also the nose gear door is closer to squared on the bottom.

As for the MD-81/82/83/88, you can't tell a difference without a tail number or knowing that a certain airline only operates 1 of the type.
The day you stop learning is the day you should die.
 
Staffan
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 8:12 am

The 737-400 has a small "hump" under the tail, I think it is in case the pilot decides to do some "ass-dragging", this protects the fuselage from beeing damaged, correct me if I'm wrong.

Staffan

 
2cn
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 9:56 am

Also on the newer 737s- at least on the 800s for sure.. not sure of the others- there are two doors on each side over the wing instead of just one.
 
IMissPiedmont
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 12:04 pm

The 400,800 and 900 all have 2 overwing emergency exits. As for the tail skid, I've never noticed that. I'll take a look tomorrow.
The day you stop learning is the day you should die.
 
FBU 4EVER!
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 6:58 pm

The tail bumper is not present on the -500 and -600 models as their short fuselage length makes a tailstrike during rotation very unlikely.It's there on all other models from the -300.
The NG versions have a completely redesigned engine pylon and mounting which also increases the ground clearance.
"Luck and superstition wins all the time"!
 
akelley728
Posts: 1965
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RE: How To Tell The Difference Between 737/md80 Models

Mon Oct 22, 2001 10:22 pm

Another way to tell the difference between the 737-300/400/500 and the 737ng is to look at the back of the engine. The -3/4/5 have a 'cone' and the NGs have a 'tube'.
 
Guest

RE: How To Tell The Difference Between 737/md80 Models

Tue Oct 23, 2001 7:12 am

Knowing what airlines fly what helps the most:

For instance,
AA is easy, they're all 737-800's
UA : 200's are easy to ID, plus the 500's are much shorter than the 300's
DL: 300's & 800's (a little more difficult)
SW 200's (easy), 300's, 500's (easy), & 700's
CO is difficult since they have 300's, 500's, 700's, 800's, & 900's
US: 300's & 400's
 
Staffan
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RE: How To Tell The Difference Between 737/md80 Models

Wed Oct 24, 2001 9:24 am

Hasn't the 500 also got landing lights on the things that cover the hydraulics for the flaps??

Staffan
 
Douglas DC-9
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DC-9

Wed Oct 24, 2001 10:32 am

A DC-9 is shorter than the MD-80, and the 717, is about the same size as the MD-80
 
IMissPiedmont
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RE: Douglas DC-9

Wed Oct 24, 2001 10:56 am

Close but no cigar. Here are the lengths of the relevant models.

-30 119.4
717 124.0
-40 125.7
-87 130.5
-50 133.7
-81/2/3 147.10
-90 152.7

As you can see the DC-9-50 is longer then the -87. The 717 is slightly smaller than the -40 and WAY shorter than the MD-81/2/3/8 and MD-90.
The day you stop learning is the day you should die.

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