fghtngsiouxatc
Posts: 158
Joined: Sat Mar 14, 2009 8:33 pm

MD-11 Wiper Question

Sat Apr 04, 2009 8:45 pm

I was browsing some of AAs old MD-11 pictures, and found this one. I noticed the windshield wipers were stowed at the bottom of the windscreen like most other airliners.


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Photo © Christopher Smay



On all other pictures of MD-11s, the wipers home position is in between the two main windshield panels.


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Photo © Juan Rodriguez - Iberian Spotters



I know it's an odd question, but was there a change from the old MD-11s to the new one? I ask because I wonder if there were any other small changes like this to newer models.
 
wilco737
Posts: 7279
Joined: Sun Jun 20, 2004 12:21 am

RE: MD-11 Wiper Question

Sat Apr 04, 2009 9:09 pm



Quoting Fghtngsiouxatc (Thread starter):
I know it's an odd question, but was there a change from the old MD-11s to the new one? I ask because I wonder if there were any other small changes like this to newer models.

Yes, it is quiter when the are upwards between the two windows. Les drag as well  Wink A minor change with great effect.

wilco737
 
kappel
Posts: 1836
Joined: Thu Jul 14, 2005 6:48 pm

RE: MD-11 Wiper Question

Sat Apr 04, 2009 10:44 pm



Quoting WILCO737 (Reply 1):
Yes, it is quiter when the are upwards between the two windows. Les drag as well Wink A minor change with great effect.

Wasn't this part of the PIP when the MD11 failed to meet it's initial targets?
L1011,733,734,73G,738,743,744,752,763,772,77W,DC855,DC863,DC930,DC950,MD11,MD88,306,319,320,321,343,346,ARJ85,CR7,E195
 
wilco737
Posts: 7279
Joined: Sun Jun 20, 2004 12:21 am

RE: MD-11 Wiper Question

Sun Apr 05, 2009 1:16 am



Quoting Kappel (Reply 2):
Wasn't this part of the PIP when the MD11 failed to meet it's initial targets?

I was told it was due to the noise and the additional drag.

wilco737
 
113312
Posts: 583
Joined: Sat Apr 16, 2005 9:09 am

RE: MD-11 Wiper Question

Mon Apr 06, 2009 1:25 am

You should be aware that the change in wiper parked position is one of the changes incorporated into the MD-10 modification.
 
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HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: MD-11 Wiper Question

Mon Apr 06, 2009 7:36 am

What caused the MD-10 to require this mod when most other Types continue to use the horizontal park position.
Is noise the only reason?
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
CosmicCruiser
Posts: 2049
Joined: Tue Feb 22, 2005 3:01 am

RE: MD-11 Wiper Question

Mon Apr 06, 2009 9:26 am

The MD-10 has a number of "inprovements" that the -11 doesn;t have.
 
AA737-823
Posts: 4902
Joined: Wed Mar 01, 2000 11:10 am

RE: MD-11 Wiper Question

Sat Apr 11, 2009 10:03 am

The MD-11 underwent a great number of tweaks throughout it's life cycle, and by that I'm referring to the period that the aircraft was actually available for order.
The original birds fell so short of range and economy targets that Douglas had to spend all remaining money (which wasn't a lot) trying to eke out what they could.
Vertical wipers are more aerodynamic than horizontal ones- see the ERJ family. I suspect we will see more of this design in the future, now that every bit counts.

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