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.
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