RJMAZ wrote:[

The 8690nm figure with 365 passengers will be extremely accurate. Boeing and Airbus give numbers like this years before first flight and they always hit the target within a couple percent.

So even if the 777-8 range is plus or minus 100nm the aircraft will still fly further than the A350-1000. In addition to this you can take any payload range curve and see the rate that which range increases as payload reduces. So we can comfortably see that 265 passengers will easily fly 9000+nm in the 777-8.

For instance lets take the 787-9 payload range chart. It shows it can fly 7500nm with 30T of payload but with a 20T payload it can fly massive 8700nm.

If the 777-8 can fly 8690nm with 365 passengers and we use the gradient of the 787 payload range curve then it cwould fly 9500nm with 265 passengers. So it can easily do Sydney to London completely standard.

I will do the maths for you.

The landing weight L2 at the end of 9500 nm will be equal to the following formula, assuming the average L/D and TSFC will be the same for 8690 nm as it is for 9500 nm. Assuming the Boeing numbers have it landing with a 30 minute fixed reserve, assume that to be 3000 kg.

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=MTOW*exp[(R2*Ln(MTOW/L1))/R1]

L2= 193433 kg

Passenger payload = L2-DOW-Fixed Res 2 = 13443 kg or 134 passengers.

RJMAZ wrote:As everyone can see the gradients of the lines are very close to being the same. So if you have a data point for the 777-8 of 8690nm at 365 passengers you can apply the same gradient to determine the range increase as payload reduces.

The gradients are not the same, the gradient is Kg/nm, known as specific range.

cpd wrote:Qantas does have them for a while, under Qantas flight numbers and call signs. I never made any distinctions on ownership or otherwise - you just decided to go down the path of pedantry, disappointing for a veteran of this site. I expected better.

We have the same arrangement with Atlas, they operate in their livery, with their crew, however with our call signs. If you look at their incidents at HKG using our call signs you will see they are different tail numbers.

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