Which will be the lightest jet

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July 9th, 2018 at 5:34:43 PM permalink
Member since: Oct 24, 2012
Threads: 881
Posts: 10536
Consider three hypothetical jets with 252 seats:

jet A has 7 seats abreast and 36 rows, with dual aisles,

jet B has 9 seats abreast and 28 rows, with dual aisles,

jet C with 6 seats abreast and 42 rows, with single aisle.

Pick the order from lightest to heaviest assuming you are working with the same basic materials.
July 10th, 2018 at 1:54:58 AM permalink
Member since: Oct 27, 2012
Threads: 55
Posts: 6688
Quote: Pacomartin
Consider three hypothetical jets .....
Consider one sweet young thing weighing a grand total of one hundred pounds soaking wet.

Put her in a large well anchored seat and you make an aeronautical engineer happy.

Put her in a smaller seat and the engineer begins to frown.

Put her in the aisle while barefoot and the engineer might be happy. Add turbulence and he gets worries because the airplane's floor is what separates the pressurized cabin from the unpressurized cargo bin with all its cables, hydraulic fluid, electrical wiring, etc. Now you put that that sweet young thing into some stiletto heels and add the turbulence and that engineer is breaking out in a cold sweat and it sure ain't because she looks so cute in that fetching outfit.

The engineer wants an aisle that is central so the variable and unpredictable weight is in the center and can be well supported. The less variable weight can be off to the sides and is of lesser concern because it is largely a known weight that is evenly distributed even in turbulence.
July 10th, 2018 at 5:21:04 AM permalink
Member since: Oct 24, 2012
Threads: 881
Posts: 10536
Real life jet configurations have a mixture of classes, toilets, and exit aisles, but these are the closest real life configurations I can find to the hypothetical.

They represent the three possible configurations for Boeing's new midsize airplane.
jetA is a recreation of the configuration in popular B763 with 2x3x2 seating which reduces middle seats to 1 out of 7
jetB is a hypothetical shortened Dreamliner (787-7)
jetC is a recreation of the unpopular stretched B757 (i.e. B753) with many rows of 3x3 seating
=== =(only 55 of these jets were sold and are all operational today Delta, United, Condor)
July 10th, 2018 at 6:57:23 PM permalink
Member since: Oct 24, 2012
Threads: 133
Posts: 6901
Speaking of airplanes, how is this thing so fast? I thought it was crashing on the first dive.

Nobody learned anything from the global financial crisis.
July 16th, 2018 at 7:30:38 AM permalink
Member since: Oct 24, 2012
Threads: 881
Posts: 10536
Boeing now claims there is demand for about 5,000 airplanes in the MOM sector. If so, this could comfortably support Airbus and Boeing aircraft.A few years ago the claim was 2,000 airplanes

The 797-6 is roughly the same size as the Boeing 767-200 and the -7 is about the size of the 767-300. Which implies the A choice (yes CAB is the correct answer). Airbus is essentially staying with the C choice by hopefully improving it's A321neo in the next five years.

But designing and building the 797-6 and 797-7 at a cost that will permit sales comparable to the price of the A321neo is problematic at best.

List prices for Airbus new engine option jets.
A319neo $101.5
A320neo $110.6
A321neo $129.5
A330-900 (neo) $296.4