Tuesday, March 20, 2018

The Boeing 797 Is No Big Technology Push, But ...?

After "Flightglobal" announces "no big technology push" for the Boeing 797, the point becomes it's not about "Moonshot" technology installed in an unknown quality/quantity; but how Boeing will shape this aircraft, and how much it will weigh, or what engines it will use?

The customers will drive the body dynamics and Boeing's design team will mold the carbon fiber aircraft for optimal customer appeal. The carbon fiber, wings, and interior appointments will also drive Boeing's design team. This makes the obvious 797 changes adhere to filling its body to a dual aisle seven-eight across seating alignment for customer appeal ranging from 230 to 270 seats. A slight oval shaped body will follow as Boeing hinted. The already established carbon fiber frame is established by the 787 families of aircraft. The "Carbon Wings" may come from Everett's wing plant. However, the engines are from the techno mystery "booth", where both CFN and GE have a dog in Boeing's 797 engine fight. 

Technology will borrow from all the lesson's learned on the 787 program. Big windows, lower elevation cabin pressured (6,000 ft), and lighting cues will dominate the passenger area. The goal for Boeing is not building a wide body like the 787 nor narrow body like the 737 Max, but a Goldilocks body somewhere in between holding the desired passenger count Boeing and its customers require and will follow from the Boeing design team. 

  • The 767 model offers the biggest clue of a 15'6" (feet)wide body
  • The 737 Max Body at six across is 11'7" (feet)
  • The 787 Body at nine across is 18' (feet).

Simple math suggests the 737 equals 180 inches and the 787 equals 216 inches, 

and the Middle of the Market dimension is 180"+216"= 396" 's by further factoring 396/2 = 198 inches or a 16'.5" for a Goldilock's NMA body width. 

This is Winging It's AP/Math worksheet.

So the 797 could be about 16' wide with Seven across or eight across seating depending on the passenger load wanted by a Boeing customer.

A passenger law should govern airline seating for a passenger's comfort and health safety based on distance/time duration traveled and seat space provided. Thus not allowing configurations of cabins in a high-density fashion for distances traveled. 

Perhaps going 5,000 miles with 270 passengers would constrain airlines to only 240 passengers and seven across seating period! It would cause a level playing field among framers for selling aircraft and stop the passenger cramming insanity.

The body width on the NMA is an oval design tweak, which has to allow a comfortable cabin while sufficiently allowing cargo options having a nominal capacity. The goal of this aircraft is about the passenger getting there in comfort and not so much as a double duty passenger and freight hauler.