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jman
Topic Author
Posts: 81
Joined: Tue Jun 20, 2017 11:41 am

School Project

Fri Aug 03, 2018 11:52 am

Hey guys,

I have a school project that involves scheduling various flights including times and prices and such. I am using the RocketRoute program but it appears that i am having some issues and am wondering if there is a way to work out what I'm doing wrong. at the moment it is stating that a trip using the 777-200ER from LAX-SYD would only need 14687 litres of fuel for the journey which at current fuel prices would cost $20,000. Given that the average cost for chartering that jet is roughly $15,000 per hour, i'm not sure what i am doing wrong in my calculations

any help would be gratefully appreciated
 
LH707330
Posts: 2352
Joined: Fri Jun 15, 2012 11:27 pm

Re: School Project

Fri Aug 03, 2018 12:06 pm

Horseshoes and hand grenades that's a ~14h flight, and the 777 burns ~7t/hr, so your ballpark fuel burn should be ~91t, which is ~115k liters. Your estimate looks off by about an order of magnitude, I'd check all of that again. Couple guesses for the 14k number:

1. First hour (climbout)?
2. Total distance ESAD?

Regarding the cost, if bulk price of fuel is ~1k/ton (I could be off with the recent price hikes), you're looking at ~$7k an hour in fuel, and if fuel is about half the total cost, then $15k sounds about right.
 
Redbellyguppy
Posts: 225
Joined: Sat Apr 01, 2017 3:57 am

Re: School Project

Fri Aug 03, 2018 2:47 pm

Don't forget to pay for crew. Catering. Airport services. Maintenance. Oh. And the airplane itself. Your airline most likely didn't buy the airplane cash money (although my airline generally does)
 
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BWIAirport
Posts: 921
Joined: Thu Jun 23, 2016 10:29 pm

Re: School Project

Fri Aug 03, 2018 4:34 pm

A website that might help you out is fuelplanner.com.
Also if you dig deep into Boeing's website, you can find their fuel planning charts. They can be tough to read as you need to know the total distance and Zero Fuel Weight of the aircraft and are designed for FL350 with no head or tailwind, which is usually never the case. But they still give you an idea of fuel burn.
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jman
Topic Author
Posts: 81
Joined: Tue Jun 20, 2017 11:41 am

Re: School Project

Fri Aug 03, 2018 11:18 pm

Thanks for your reply.

When i said that the cost was $15000 per hour that includes fuel and crew and maintenance and whatnot. based on the amount of fuel required given to me by rocket route, it would only cost $20000 for fuel for the WHOLE flight.

In the program, it lets you put in the following weights:
Max ramp (248115kg)
MTOM (247210kg)
MLDGM(201848kg)
MZFM(190508kg)
Basic Empty weight (159570kg) Arm (cm) (0.00)
Crew (680kg)
Options to add 17 reserve weights
Baggage weight (10000kg)

Fuel Balance table
+ Tai Fuel (499.07kg)

It then lets you alter various stages of flight

Climb
FL <190 - Flow 250, FPM 2500, TAS 300
FL >190 - Flow 250, FPM 2500, TAS 300

Cruise
FL <190 - Flow 250, TAS 480
FL >190 - Flow 250, TAS 480

Descent
FL < 190 - Flow 250, FPM 1500, TAS 250
FL > 190 - Flow 250, FPM 3000, TAS 250


Not sure what i need to adjust or where, but when i add weight to the reserve 1, 2, 3 etc, it requires more fuel to be uploaded.

Any help is gratefully appreciated

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