Starship
Topic Author
Posts: 1038
Joined: Wed Nov 24, 1999 3:26 am

Why No Main Landing Gear Doors On The 737?

Sun Sep 24, 2000 5:57 am

The 737, both Classic and New Generation models have traditionally not been fitted with main landing gear doors. I am curious to know as to why, if they are not necessary in the case of the 737, they are in respect of other airliners equipped with single or double wheel main landing gear bogies.


Photo: Boeing
Behind every "no" is a "yes"
 
JT8DJET
Posts: 197
Joined: Fri Jul 07, 2000 12:28 am

RE: Why No Main Landing Gear Doors On The 737?

Sun Sep 24, 2000 7:47 am

From what I have herd, Boeing wanted to keep it simple, by not installing any main gear doors and only installing fixed nose gear doors.
 
Guest

RE: Why No Main Landing Gear Doors On The 737?

Sun Sep 24, 2000 9:00 am

I've heard weight concerns is why.

AA737-800
 
jim
Posts: 448
Joined: Thu Jul 29, 1999 8:12 am

RE: Why No Main Landing Gear Doors On The 737?

Sun Sep 24, 2000 11:00 am

There is also the lack of space on the early model 737s. The wheel well is really JUST big enough to hold the gear and hydaulic equipment. There isn't any room for a door actuator, latch hook, etc.

Of course, we 'vetrans' can cause the 'newbie' grief by having him get the gear door from the parts rack. It is about 20" round and fits over the wheel very nicely.  

Jim
 
NKP S2
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Joined: Mon Dec 20, 1999 3:16 am

RE: Why No Main Landing Gear Doors On The 737?

Sun Sep 24, 2000 1:09 pm

I think it's great. The 737 wheel well is roomy and easy to work in and you don't have the added weight and complexity of doors, actuators, sequence valves etc. The smooth wheel cover on the outboard mains streamline just fine when retracted. Damn good airplane in general...I like it.
 
Adam84
Posts: 1368
Joined: Sat Jul 24, 1999 6:10 pm

RE: Why No Main Landing Gear Doors On The 737?

Mon Sep 25, 2000 8:57 pm

If Boeing had added gear doors, would this increase range at all or make it have less wind noise?
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: Why No Main Landing Gear Doors On The 737?

Mon Sep 25, 2000 11:32 pm

Why would you think having MLG doors increase range and such? It's not like they're flying around with a big hole under the fuseage-- When the MLG is retracted, the smooth wheel cover on the outboard mains fairs with the tire, which in turn fairs with the bottom of the fuselage...aided by rubber blade type seals around the W/W opening. Increase in drag over a door is negligable. Keep it simple and leave the technology for technology's sake theory to Silicon Valley.
 
oxygen
Posts: 633
Joined: Tue Sep 14, 1999 12:27 am

RE: Why No Main Landing Gear Doors On The 737?

Tue Sep 26, 2000 12:19 am

Boeing worked out that the lower weight and the simplicity of the system makes up for the slight ineffecience in aerodynamics, so they decided to omit it.
 
avt007
Posts: 1989
Joined: Mon Jul 10, 2000 4:51 am

RE: Why No Main Landing Gear Doors On The 737?

Wed Sep 27, 2000 12:36 am

As one of many engineers who have whacked their heads on various gear doors, I wish more aircraft were this way!
 
Guest

RE: Why No Main Landing Gear Doors On The 737?

Wed Sep 27, 2000 4:04 am

Since the 737 is used mostly on short haul flights, the benefits of adding gear doors are negligible. Boeing did put on those cool hubcaps to help cut drag. I like Southwest's color coordinated orange hubcaps myself.
 
B727-200
Posts: 1008
Joined: Fri Nov 05, 1999 11:28 am

RE: Why No Main Landing Gear Doors On The 737?

Wed Sep 27, 2000 7:43 am


What does the outside air temperature, friction at cruise speed and lower pressure at altitude do to the tyre with it being exposed? Are the tyres on the B737 made of a special compound or thickness?

B727-200.
 
jkelley480
Posts: 119
Joined: Tue Feb 01, 2000 10:03 am

RE: Why No Main Landing Gear Doors On The 737?

Wed Sep 27, 2000 8:01 am

That's also what I was wondering.
 
n949wp
Posts: 1398
Joined: Thu Feb 03, 2000 3:45 pm

RE: Why No Main Landing Gear Doors On The 737?

Wed Sep 27, 2000 10:46 am

Since landing gear bays are not pressurized, the tires will be subjected to the same frigid outside temperatures at cruise levels, with or without landing gear doors. As for heat generated due to air friction at cruise speeds, I suppose the rise in temperature on the tires are going to be negligible (if at all), as they are retracted into the fuselage away from the slipstream. Besides, tires are designed to handle much much higher temperatures during landings, high-speed rolling, and heavy braking.

'949

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