I would like to know how many xbox user have made a long haul flight without issue, without cheating by adding fuel, with auto sim rate x8 or 16, respecting procedure, flight plan steps by steps and so one…
As I don’t like to fail, I’m going to keep on looking. 
I don’t fly on Xbox but just want to let you know anything over 4X can cause issues on my PC (i7-11700KF clocking up to 5GHz per core). You see it mostly during course changes when things oscillate like nuts because as the sim tries to go through larger time-steps and compute faster, there is less resolution in the mathematical simulation (fewer calculations per second of simulated flight time). If you watch Emi’s videos about time acceleration, he notes these kinds of things.
Even on the highest end PCs available now, I’d be hesitant to fly at over 8X even on oceanic segments.
I have done so far 6 or 7 long haul flights.
The first two flights ~ 9 hrs and I used 8X and I got insufficient fuel warning at some point, then around ~1000 nm from destination my predicted fuel at destination reached ZERO. Had to add fuel on one of the flights and divert on the second one.
All the other flights I have done have been 12 to 14 hrs long and have used mostly 1X (I recall once or twice using time compression) and fuel is pretty close to SB prediction for all of them.
So it’s really strange.
We are almost 100% sure it is not connected to simrates.
I am right now over the Atlantic at FL360, and the sim gives me a temperature of -12 degrees; that is just impossible and clearly affects fuel burn.
Are you talking about TAT?
I am pretty sure that the sim gives false temps.
I have made again EGLL - KJFK but now with the pmdg 737 800.
0 Pax
0 Cargo
20600 kg of block fuel.
I took off with an estimate fuel reserve at KJFK of 5100 Kg.
At the begin of the cruise, i use auto sim rate X4.
1100 Nm before TOD, my estimate reserve fuel to KJFK dropped to 0 (near 4 hours after take off)
I don’t fly long-haul or trans or trans-oceanic, so here is my query. Assuming one prepares their SimBrief flight plan directly before departure such that the weather and winds forecasts are fresh; what happens in the sim to live weather processing during time acceleration or compression? Is the sim receiving live weather in real (non accelerated/compressed) time, and if so, does that live weather data still correspond to where the flight actually is along the flight plan or in airspace? And if correct geographically, is that weather data still correlated temporally, given the acceleration/compression of the flight plan? Am not sure I am stating this clearly so here is a theoretical example.
Depart stateside at time A. Weather data corresponds to departure location at time A.
ToC at time B over an ocean. Weather data still corresponds to flight location as planned.
Accelerate/compress enroute beginning at Time C.
Some time later, is live weather data stuck in space at Time D when…
The flight resumes normal time scale, albeit in a different point in the plan than the forecasts for Time D?
As one can see, I’m not sure this time/distance displacement of an accelerated/compressed flight may cause any issues with live weather relative to weather forecasts. One might propose that the greater the time/distance displaced, the more discrepancy one might expect between forecasted and actual data weather flowing into the sim. Or does the sim somehow compensate for the discrepancy, if one exists? Not sure this is a thing, what am I missing here? Cheers!
That is indeed a factor, but you would need some very wild weather changes for it to be a serious issue. Keep in mind that a pilot can never assume the weather prediction on arrival is as it in his OFP, so time accel or not, this is something a pilot needs to factor in.
Perhaps then the minimum checks one might do exiting accelerated/compressed flight would be to check to see if the live weather data coming into the sim still corresponds to the flight plan, i.e., winds and temperature aloft for the current altitude to assess any impact on fuel burn, and then upload a new winds forecast for the balance of the flight? The latter may be more or less meaningless if at ToD with thrust retard for descent? Or not if there is still a bit of cruise left, as any discrepancy in fuel burn becomes more meaningful the further one is from destination?
For example, flying from North America one takes some time in cruise over the UK to enjoy the view before descending to a Western European destination. That bit of fuel burn could be critical if there is a data discrepancy between what is in the FMC (and FOB) and live weather data to the sim? OTHO if the weather is more or less stable this may not be much of a factor given that the flight hews to plan, including altitude/descent profile, if the winds/temperatures aloft still conform to the forecast at dispatch. Fun to think these factors through a bit before I finally give in and try to cross the pond!
On my last 4 or 5 flights I don’t see any brake temperature increase after landing. Anyone else seeing this? I am not using any custom panel states.
I guess my only option will be to re-install and try again or try with a different livery.
Definitely a fuel burn issue when using Simrate increase.
PMGD 777 on Xbox X (all World Updates installed).
Live time and weather 2024-08-24 departure about 1400 UTC
Simbrief flight plan: CYVR ALNOD IKNIX YQL ZOMTA AGLIN OTNIK BOXUM7, FL370.
Passengers: 366
Block Fuel: 81,235 lbs
Cargo: 18,300 lbs
Payload: 87,840 lbs
EZFW: 459,520
ETOW: 539,355
At FL370… between 20 and 30% through the flight..
TAT: approx -20 C
Outside temp: -50C with a tail wind
… Is the PMDG calculating the TAT based on a sensor on the skin of the plane (making it unique to the 777 or even to the livery)? Or is TAT provided as a raw temperature by the simulator?
Fuel Flow is 8.6 per side
1x Simrate, Estimated Destination Fuel = 17.4… then changed to
4x Simrate, Estimated Destination Fuel = 14.6 and dropping fast
Flew KSFO-KEWR this morning (my longest flight to date and my first transcontinental flight). The plan was to take advantage of prevailing (but variable) tailwinds, and to do some 4x time compression past the continental divide/over the plains states, and to see the impact over the Great Lakes region back in 1x time. Winds/temps aloft correlated with the flight plan early on. After the fast forward over Nebraska, South Dakota and Wisconsin; I started comparing the actual winds aloft with the SimBrief flight plan (DAL OFP format). Sure enough, there were differences! And they were in my favor, meaning I was getting more tailwind than forecast for the last third of the flight than if I had flown the entire flight in real time. This meant that I arrived with a little more reserves than planned for, but that is not the point of sharing all this anecdote!
Had the weather picture been different, meaning that the actual winds were no longer favorable after the time shift, then the fuel situation could have been a concern. With a longer flight, trans-oceanic rather than trans-continental where more time would have been compressed, I could see that a discrepancy between the forecasted winds aloft and the actual ones served as live weather closer to the destination could result in a fuel shortfall. Wonder if folks are taking this kind of thing into consideration when flight planning for long haul? One could see that nine out of ten days, the differences might not derail one’s flight plan, but on that tenth day when the weather picture is changes significantly across the route, there might be an impact on FOB: Hopefully it is a surplus rather than a shortfall. Wonder how folks think about this kind of thing when flight planning?
Hey, looks like we may have been flying parallel routes this morning! I’m looking at your route now in Navigraph and wondering about this segment: ZOMTA ALGIN OTNIK. Was that southerly dip to take advantage of the jet stream earlier this morning? Or was that just something SimBrief suggested? Cheers!
I just accepted what it produced, the only custom entry was choosing the PMDG (awemeter) airframe… PAX, cargo, etc all auto.
Not sure if this has been reported, or experienced, by anyone yet. During preflight set up I entered the STAR and arrival runway in the DEP/ARR page… then mid flight I went to check on it, and ended up selecting the STAR and runway again, and it duplicated the entry in the RTE and LEGS pages. The behaviour in the 787 is that it would remove the previous STAR and runway from the RTE and LEGS, and enter the new selections. Not sure how it is supposed to behave.
Edit - I do want to add, the PMDG 777 on Xbox X was VERY smooth to fly, and handles really well on the ground and in the air for me so far. My first flight I landed by hand on the centerline and it felt really good.
Today, i made LSZH - OMDB
Block fuel: 64542kg
Pax: 200
CI: 200
ZFW: 190.4T
Fuel Factor on SB: P05
Fuel planning on SB:
Contingency:60 min
Reserve : Auto (FAA)
I took off with 20,3 T estimated At OMDB.
SAT and TAT were exact with SB data.
I decided to use Auto Sim Rate After 1h07 flight in x1. The estimated fuel at OMDB was 19.2T. (200kg more than predicted / see screenshot)
Now, issue Begin with use of auto sim rate
From 1h07 to 1h20 in auto sim rate x 8:
fuel estimated: 18.5T
From 1h21 to 1h34 in auto sim rate x 4:
Fuel estimated: 18.2T
From 1h35 to 1h50 in auto sim rate x 4:
Fuel estimated: 17,7T
From 1h51 to 2h51 in auto sim rate x 4:
Fuel estimated: 15.2T
From 2h52 to 3h52 in auto sim rate x 4:
Fuel estimated: 11,8T
From 3h59 to 4h59 in auto sim rate x 8:
Fuel estimated: 8T
From 4h59 to 5h29 in auto sim rate X 8:
Fuel estimated: 6.7T
5h34 TOD fuel estimated: 6.4T
I Land with 6.2T far away from the 19 predicted.
I respected step climb from the Fmc and mach number.
Do i have to reload wind and temps After every acceleration? How do you proceed?
Next time i will retry this flight but in X1.
Thank you
very thorough report.
Maybe Im missing something, but if you take off in real time in live weather and then compress time, arent you flying in the future? That is, if you compress time 8x then is the sim trying to use future weather predictions and applying it to the simulated flight? I had assumed live weather constantly updated to match real world data but how is it supposed to interpolate future weather when flying 8 or 16 times as fast as real life?
Also, it seems obvious, but has anyone tried flying these long haul flights with compressed time with preset weather? Id assume that would work fine since there would be no change in the weather over the flight.
I just recently bought the 737 on Xbox and am so impressed I am considering getting the 777 as well. Id like to understand the compressed time and weather dynamics first, however.
Good point, but when you create a Simbrief flight plan, there are predicted winds for the duration of your flight. Also the weather info supplied to the sim (which comes from MeteoBlue, I think) includes some amount of forecast data - I would guess that is what it is using…
Datapoints from KSFO flying to EGLL - seeing:
Waypoint FMG
Waypoint N50W109
Waypoint YYQ
Waypoint N63W040
I also notice that CLB is on the display above the N1 visual. Does this indicate I am still at Climb thrust? If so, this does not seem right?
Winds match forecast from flight plan
This is using live weather and no time acceleration. I loaded all wind data into the FMC before T/O.
Will update the above post as I progress.
So far my thinking is that loading wind data is ESSENTIAL for accurate fuel burn, and that possibly there is something up with time compression on cruise.
