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Aircraft Windows And Weight Savings  
User currently offlineKochamLOT From United States of America, joined Sep 2007, 301 posts, RR: 0
Posted (6 years 5 months 4 weeks 14 hours ago) and read 3447 times:

Just curious....

The 764 and 777s have large windows which Boeing says saves weight. If I can recall correctly, Boeing said that for the 764, windows saved the aircraft around 600lbs.

The NextGen CRJs boast larger windows...
Embraers have nice large windows...

So taking what Boeing said and applying this idea to other aircraft, why havent ALL manufacturers incorporated larger windows into their cabins?

Besides perhaps a rise in the cost of the individual aircraft, there are more benefits including better and brighter passenger pleasing cabins and economic savings in the long run from reduced weight.

Why do airlines like Boeing, Canadair and Embraer have larger windows whereas Airbus keeps their small windows. The older MDs also have tiny ill placed windows.

3 replies: All unread, jump to last
 
User currently offlineIronDuke08 From United States of America, joined Feb 2008, 117 posts, RR: 0
Reply 1, posted (6 years 5 months 4 weeks 13 hours ago) and read 3379 times:



Quoting KochamLOT (Thread starter):
The 764 and 777s have large windows which Boeing says saves weight. If I can recall correctly, Boeing said that for the 764, windows saved the aircraft around 600lbs.

Haha I asked you that question on the 767 winglet thread and guessed it was weight loss...thanks for answering if here.

I also suggested that the weight loss is not as much from the size of the window as the shape, with more ovoid windows being more pressure resistant and requiring less structural reinforcement and therefore being lighter than square ones.

Hopefully someone who knows the real answer will sort this out.


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 2, posted (6 years 5 months 4 weeks 12 hours ago) and read 3318 times:



Quoting KochamLOT (Thread starter):
The 764 and 777s have large windows which Boeing says saves weight. If I can recall correctly, Boeing said that for the 764, windows saved the aircraft around 600lbs.

I'm not sure that anybody claims windows save weight...they don't. There's a significant weight penalty to having windows. Better window designs can save weight *over the prior design*, which I think is what happened with the 764 and 777, but you can always build a lighter fuselage without windows than with.

On the flip side, if you took the 764/777 window technology and used normal "small" windows you'd be even lighter, but it wouldn't be as nice a passenger experience. The 787 has huge windows because the CFRP fuselage lets them make the windows bigger without paying a big weight penalty. They'd still be a lot lighter if they used normal sized windows, or no windows at all.

Tom.


User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 3, posted (6 years 5 months 3 weeks 6 days 20 hours ago) and read 3090 times:



Quoting Tdscanuck (Reply 2):
......but you can always build a lighter fuselage without windows than with.

I agree because every window has its own frame. These frames are used to put the strength back in the the fuselage after the opening has been cut for the window. The window frame actually weigh more that the window.


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