Touchy subject !
Dont take my word for the Holy word.

a 200LR burns 271.3lbs of fuel per minute in crz M.82

to set the reserve:

Taxi 66.6lbs per min     18minutes
burn - flight  so many hours
xtra fuel at destination, deal with ATC- hold and traffic 36 minutes
Alt destination , flight time  varies with distance
last a final reserve of 30 minutes

you add all this and it becomes your block fuel.

FSX fuel burn is full of baloney.

This is flying in real weather.

the CS777 fuel burn is right on - I have been amazed!!!!!!!!!!!!!!!!!

Too much is better than not enough

We dont pay for fuel !!!  

Raymond   Boeing or nothing
KFLL  South Florida

Hi,   COSTS INDEX  

The airlines instruct the crew about the costs index. It may be the same for every flight or could vary from flight to flight.

Two major components.   Fuel costs and operational time costs.

The two extreme are  

0   will result in maximum range and minimum trip fuel.
    but will ignore the costs of time.

Conversely a Max entry, the FMC  uses the minimum time at Max speed and will ignore the costs of fuel

Airliners fall in between these two.

I fly at econ   60, it gives me a speed of 301 and a M .796
This number is realistic for a large Boeing-twin engines.

On long haul flights, I see airplanes come home 2 hrs late each flight
at M.82 -save a lot of fuel at the end of the year.  

Raymond   Boeing or nothing
KFLL   South Florida  

The 200LR and the 300ER have very similar flight charateristics
Airlines interchange the two on the same rte, and the same pilots fly either one  from one flight to the next.

The 300 carries more pax but the 200 has the longest legs.
Also the 200LR can be fit with three extra fuel tanks to replace bins in the cargo and extend the range to almost 9400nm  

Happy flying  

Raymond    Boeing or nothing
KFLL  South Florida

You make it sound like the "Insufficient fuel" message should only appear if the fuel drops below 2.0 (2,000 pounds)! I get the message if the estimated fuel to be remaining at the end of the route drops below the reserve I have set. So which is it supposed to be?

Hi, My fuel calculation technique is working. I simply copy the airliners.

Today my wife flew ACA 925, KFLL to CYUL ( Montreal ) to visit her family - I did not go, cause they all come south in the winter time.
She flew an A320. I asked her to go talk to the capt and bring me back the flight plan + cockpit print - will see.

I chose my trusty 757-200 to make the flight at the  time, same weather ?

My fuel calculation was this way.

flight time  3hrs - avg for last 7 days of AC
180 min
 45 min  at arrival ( hold, traffic ,ATC)
  0  alternate - major airport 20 miles away - Mirabel
 30 min of final reserve
and 16 min of taxi at 35lbs a min.

My 57 burns 128,65 lbs per minute in CRZ.

At the gate my fuel block was 33,365 lbs.
I took off at 2.45 same as ACA - they were late 1 1/4 hr.
Initial CRZ FL340 -step up to 38 following Vnav page 2.

There is a terrain constraint of 6000, 35 miles from arrival.
FMC did it right. "RESET MCP" should work both ways , up or down.
I landed on RW24R facing a 17kts crosswind at 25 on the right.
I added 6kts to  VREF30/119 to make 125.
All was right  - flight time 3hrs and 15 min.  fuel left 9.3 - right on, my reserve and a few dust.
ACA made it in 3hrs and 11 min - same path and similar weather.

4 minutes difference over 1450 nm!!!!!!! It is scary !!!!!!

I sent a tel message to my wife saying. " You have now arrived "  

Raymond    Boeing or nothing
KFLL  South Florida  

I normally fly at CI  60  .796  301kts
But on that flight I made the CRZ at .82, I knew that ACA would fly around that number
( from previous flight plan)      


Raymond   Boeing or nothing
KFLL  South Florida

Hi, have a good flight !

distance is 6788 sm
flying time - my estimation  - 12 hrs and 15 min
fly real weather, to benefit from westerly wind.

reserve is as I previously wrote.
alternate +-  90 miles is 2.4

you need a 200LR
max of M.82 in crz
initial crz at FL310, step up 2000 at a time,  4 times to FL390, every 2 hrs.

There is no direct commercial flight from your location to Sao Paulo, Br
If you get close on fuel, you can divert to Rio and go watch some exotic dancing girls  Oh La La !!!!!!!!!

 

If your rte is longer than mine, you have to make a correction on the flying time /  speed is 554kts

I think it will be right on.

Raymond   Boeing or nothing
KFLL  South Florida