Mr Spaceman
Topic Author
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

"Round" Cabin Doors On Old Viscounts?

Tue Jul 30, 2002 5:19 am

Hi guys.

During a photo search of the Vickers Viscount, I was surprised to see that several of the aircraft have "round" cabin doors instead of the usual rectangle shaped doors.

The first Viscount proyotype flew in 1948, and like most airliners had several versions develped over the years.

My questions are:

Why did the Viscount have round doors?

Did it have to do with cabin pressurization?

Are the Viscounts the only airliner with this feature? (I couldn't find any photos of other types with round doors).

When did Vickers start building Viscounts with normal looking doors?

Any info will be very interesting.

Round doors....
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Photo © Andy Chetwyn



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Photo © David Unsworth



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Photo © Mel Lawrence



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Photo © Carl Ford



Normal doors....
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Photo © Steve Williams



Chris  Smile

"Just a minute while I re-invent myself"
 
IMissPiedmont
Posts: 6200
Joined: Wed May 23, 2001 12:58 pm

RE: "Round" Cabin Doors On Old Viscounts?

Tue Jul 30, 2002 10:14 am

The 700s had the "round" doors, the 800s the "normal" doors. Why? I don't know.
The day you stop learning is the day you should die.
 
Duncan
Posts: 134
Joined: Mon Apr 08, 2002 1:14 am

RE: "Round" Cabin Doors On Old Viscounts?

Tue Jul 30, 2002 12:34 pm

Probably to reduce the stress concentrations due to cabin pressurization. After the early Comet disasters, square cutouts in pressurized fuselages were frowned upon due to the high stress concentration at the door corners.

This is inherent in all aircraft, you will notice on Boeing 707 - 747 designs large Texas patches, called such because of their similar shape, and sometimes size  Big grin as the state of Texas. There is an approximae 3.0 stress concentration factor at the door corners, the additional area provided by the doublers, significantly reduces the stress in the skin and therefore increases the life of the fuselage before cracks start to appear.

That's my guess anyway.

Duncan
 
Mr Spaceman
Topic Author
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

RE: "Round" Cabin Doors On Old Viscounts?

Wed Jul 31, 2002 5:09 am

Hi guys.

Thanks for your replies gentlemen.

>Duncan, if you look very closely at the 747 photos you can see what appears to be these Texas patches / doublers around the doors....that you mentioned. Are these objects in the airframe them?


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Photo © Dean Allchin



Does anyone know if the Vickers Viscount is the only airliner ever built with round cabin doors?

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Photo © John P. Stewart



Chris  Smile
"Just a minute while I re-invent myself"
 
Duncan
Posts: 134
Joined: Mon Apr 08, 2002 1:14 am

RE: "Round" Cabin Doors On Old Viscounts?

Wed Jul 31, 2002 8:12 am

The Texas patches are external doublers added either as a preventative modification to stop cracking, or a repair to fix existing cracks, and prevent further cracking in the same area. Next time you board an old 727, 737 or 747, check out around the L1 door for this type of patch.

DD
 
virgin747
Posts: 289
Joined: Wed Oct 13, 1999 12:20 am

RE: "Round" Cabin Doors On Old Viscounts?

Tue Aug 13, 2002 1:14 pm

you gotta watch your head when boarding those Viscounts.... We have one at the Western Canadian Aviation muesum, and I've bumped my head a few times.

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