keta
Topic Author
Posts: 405
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What Are The Small Bars On Top Of Doors?

Tue Apr 18, 2006 9:45 pm

I don't know how to call them... You may see it clearer with a picture the small "bars" located in top of airliners' doors:


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I hope you see what I mean. Are they some structural thing? They don't look like aerodynamic devices at least. What are they?
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David L
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RE: What Are The Small Bars On Top Of Doors?

Tue Apr 18, 2006 9:50 pm

To stop rain water running down into the doorway?

Quoting Keta (Thread starter):
don't look like aerodynamic devices

Although they're not there for aerodynamic reasons I'll bet they're aligned to reduce any aerodynamic penalties.
 
Buzz
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RE: What Are The Small Bars On Top Of Doors?

Tue Apr 18, 2006 10:05 pm

Hi KETA, Buzz here. Those are "rain gutters" to channel rivulets of rain away from the cabin doors as the rain rolls down from the top of the fuselage.
It seemed that the DC-10's "rain gutters" didn't work as well as the Boeing 727 / 737... at least in "sunny" Portland Oregon (it tends to rain here). I'd joke that the DC-10 was designed in southern California... sunny warm weather.
g'nite
 
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Zkpilot
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RE: What Are The Small Bars On Top Of Doors?

Tue Apr 18, 2006 10:10 pm

They are there to stop rain dripping onto passengers or onto the floor of the aircraft when the door is open for boarding/deboarding.
They are aligned so as to be as little drag penalty as possible... since most aircraft fly with a slight nose up attitude, the rails are angled downwards at the front so inflight they are almost level.
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RichardPrice
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RE: What Are The Small Bars On Top Of Doors?

Wed Apr 19, 2006 6:05 am

This came up in a previous thread, its a gutter to direct deicing fluid away from the doors as it can damage the door seals.
 
grandtheftaero
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RE: What Are The Small Bars On Top Of Doors?

Wed Apr 19, 2006 10:11 am

Quoting Zkpilot (Reply 3):
since most aircraft fly with a slight nose up attitude, the rails are angled downwards at the front so inflight they are almost level.

I believe they are angled to be tangent with the circulation about the wing since the gutters aft of the wing are angled in the opposite direction.
 
keta
Topic Author
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RE: What Are The Small Bars On Top Of Doors?

Wed Apr 19, 2006 6:39 pm

Hehe I never thought it was for that. Thanks for the replies!  Smile
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NZ1
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RE: What Are The Small Bars On Top Of Doors?

Fri Apr 21, 2006 5:51 pm

The thing is, they are bloody useless in normal ops. The water just spills over the top. Speaking from experience.

NZ1
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David L
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RE: What Are The Small Bars On Top Of Doors?

Sat Apr 22, 2006 3:34 am

Quoting NZ1 (Reply 7):
The thing is, they are bloody useless in normal ops. The water just spills over the top. Speaking from experience.

You need someone to clean out the leaves from time to time.

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