what if it was 3-3 with a 50% wider aisle and A380 width economy class seats, would it then be a good fuselage? It would be exactly the same fusealge width. I guess this is about options.
A380 width economy class seats?
3 seat block on 3-4-3 abreast A380 main deck is 157 cm.
2 such seat blocks are 314 cm. A320 cabin is 369 cm wide. This leaves 55 cm for aisle plus gaps between wall and armrest. 50 cm aisle is sensible.
50% wider aisle means 25 cm extra width over A320. Which happens to be the width of Tu-114 (420 cm outside, 392 cm inside).
Technicallly: taking a just wide enough 3-3 fuselage and putting up to 300 people in it is probably structurally over the limit. You have to add lots of material the make the narrow long pipe stiff & strong enough adding a lot weight.
Boeing 757-300 has 289 seats inside. And there are longer narrowbodies - Concorde is longer than either 757-300 or DC-8-61, and a narrower tube at that.
Making a Tu-314 which is comfortably wider than A320 and longer than DC-8-61 should not be prohibitively hard.
Apart from that a single aisle with more then 300 people starts to serious prevent efficient moving around of crew and passengers.
Even with an extra wide aisle?
L-2000, by the way, is close to 300 seats at 5 abreast, and it is actually narrower than DC-9/MD-90. So no extra wide aisle there.
The additional 20 inch also pays of in the front of the aircraft making possible an additional fifth seat in domestic first
5 abreast premium seating is already in use on quite some 737 operators. It is presumably possible on A320.
and most importantly giving room for new generation 4 abreast long haul Business Class cabins. Business class is the money maker in many markets..
Eos is doing a lot with 4 abreast on 757.
The additional width is also height in the cabin providing center bins that puts of the pressure of restrained stowage. As can be seen they are higher then the side bins enabling people to easily cross the cabin where the folding seats are located.
Still a bad idea.
The height of A320 is 213 cm at ceiling of aisle, 160 cm below the bins. A330 is 240 cm at the top of aisle, 165 cm below the side bins, 178 cm below the centre bins.
Add 25 cm to the width of A320 cabin, and to height because you are not adding any height to underbelly, and you wind up with 238 cm ceiling. Plenty of space to make the side bins slightly higher than on A320, and far more spacious. No need to stick in centre bins.
Oh, and as for wider middle seats, it is certainly offered as an option on Boeing 737 documentation.