zeke wrote:I will do the maths for you.
MTOW 351534 Kg
DOW 173000 Kg (From Fred’s previous analysis on this thread)
R1 8690 Nm
R2 9500 Nm
P1 365 pax 36500 Kg
L1 212500 Kg
Fixed Res 1 30 min 3000 Kg
Fixed Res 2 70 m 7000 Kg
The landing weight (L2) at 9500 nm assuming 70 minutes fixed reserve (Qantas fuel policy).
L2= 193433 kg
Passenger payload = L2-DOW-Fixed Res 2 = 13443 kg or 134 passengers.
To the average person all your fancy calculations makes you look like you know what you are talking about.
However your calculations is wrong. It shows the 777-8 having the same range as the 787 with similar payload. The 787-8 payload range chart on the Boeing ACAP clearly shows it can lift 20,000lb of payload 9500nm. That is 90 passengers. So according to you the 777-8 can only carry 44 more passengers than the 787-8. Very doubtful.
The A350-900 ACAP document shows it can carry a massive 20T of payload 9500nm. That is 50% more passengers than your 777-8 number.
What you have done is added the reserve fuel twice on the 777-8 number. The 8690nm value with 365 passengers already includes reserve fuel so you've added twice the reserve fuel reducing the payload by approx 6000-8000kg.