New aircraft added: PSS B757-200 and -300

Tips, instructions and other information on adding your selected aircraft type to the vroute's fuel calculator

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Michal Rok
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New aircraft added: PSS B757-200 and -300

Post by Michal Rok » Wed Aug 06, 2008 6:26 am

Today Boeing 757-200 and -300 (tuned for PSS version) were released - thanks to Russ Vierra!


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Re: New aircraft added: PSS B757-200 and -300

Post by Clipper 24/7 » Mon Jan 19, 2009 1:58 am

I find the 757-200 fuel planner giving me very strange numbers.
Example: I set payload to way below maximum,and I get that "distance out of range" message.
When I choose less payload,I end up getting a message that I would need MORE fuel than I did with a higher payload??!?
Quote from Boeing.com:
High-gross-weight versions(256.000lbs) of the aircraft can fly 4,500 statute miles (7,240 kilometers) nonstop with full passenger payload. These system attributes contribute to the 757's versatility, allowing it to serve more markets.
In real, Continental flies EWR-OSL with a 752. They themself states that it's 3668nm.
They have a 183 seat config.
I tried to fuel up using a route which were only 3255nm(6793km) and far from full payload.
So something isn't right here.
I'm gonna do a testflight tomorrow,with full payload,do the flight and check fuel numbers through out the flight.

Tommy

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Mark Richards
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Re: New aircraft added: PSS B757-200 and -300

Post by Mark Richards » Tue Jan 20, 2009 9:13 am

Tommy

As per this forum message, Michal is away until Sunday 25th. Sorry but you're not likely to get a reply in the next few days.

Mark
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Michal Rok
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Re: New aircraft added: PSS B757-200 and -300

Post by Michal Rok » Sun Jan 25, 2009 12:22 pm

Indeed something is wrong here.

The fuel capacity indicated by vroute (75801 lbs) appears to be roughly correct. The problem is not in the payload (although very low payload "solves" the problem), but in the fuel burn data. The simulated plane simply burns too much fuel to be able to reach 3600 nm range. I have calibrated my B752 model based on data submitted by Russ, and it seems like either:

a) the test flight results were substantially wrong (unlikely)
b) a mistake was made somewhere in the process and CaptainSim data was used instead of PSS (or the opposite)
c) the flight sim model by PSS is unrealistic, burns too much fuel and is in fact not capable of flying 3600 nm range

The c) option appears likely, as I had to apply an almost +20% correction against real life burn data to match flight sim numbers.

To resolve this puzzle, i would appreciate if you could run a normal flight, using vroute fuel info and writing down the actual fuel levels vs. vroute predictions that are printed in Flight Progress Card. We could see then if the flight sim B752 fuel burn is in fact so high.


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Re: New aircraft added: PSS B757-200 and -300

Post by Clipper 24/7 » Wed Jan 28, 2009 11:19 pm

I can say this much so far,
Enroute on cruise the PSS uses less fuel than calculated by Vroute.
I flew:
EWR-OSL
Distance: 3300nm
Payload: 46.940 lbs
TOW: 255.000 lbs
Fuel onboard: 72.120 lbs
Final fuel: 16.000 lbs
Fuel used: 56.120 lbs
Speed: Mach .80

So no doubt that the PSS 752, CAN operate distances as per Boeing official numbers.
The problem for me was,I couldn't print out a flightplan with fuelburn with my actual payload.
I printed one with payload of half of what I had,and still...
I used less fuel than predicted and ended up with 5300 lbs less fuel.
With payload 20.400,vroute suggested 76.470 lbs of fuel.
So,it's not a little off.. it's WAY off.

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Re: New aircraft added: PSS B757-200 and -300

Post by Michal Rok » Fri Jan 30, 2009 4:49 pm

I know it is way off, but I still need more accurate information.

Would you please write down the exact numbers by waypoints on the flight progress card (for each waypoint), with winds/weather off, and send me the flight progress card with info (can be a photo of the paper with handwriting). I will try to recalibrate the airplane model to match your numbers.

A shorter flight would be enough - 1000nm is absolutely fine, you don't need to fly transatlantic.


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Re: New aircraft added: PSS B757-200 and -300

Post by Clipper 24/7 » Sat Jan 31, 2009 8:51 pm

Out of town right now,but
Yep, I'll try to get on that during next week.
I'll just edit in the the numbers on fp card in photoshop or paint and mail it to you.

Tommy

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