The FCOM for the -8 has a set of performance dispatch tables.  Given route length in nm and an average wind you can come up with a pretty good estimate to use for a long haul flight with step climbs.  That's what I've been doing.

Flyprecisely (https://www.facebook.com/FlyPrecisely/) might at some point come up with -8i and -8F profiles. 

Pity given its rarity that PMDG couldn't release a profile for it like FSL did for their A320.

9 hours ago, VHOJT said:

Pity given its rarity that PMDG couldn't release a profile for it like FSL did for their A320.

Agreed. Not only FSLabs released a PFPX profile for their Airbus A319 and A320 but also Leonardo attached a profile for their Maddog as well as Aerosoft for their CRJ.

Edited September 23, 20187 yr by kityatyi

7 minutes ago, kityatyi said:

Agreed. Not only FSLabs released a PFPX profile for their Airbus A319 and A320 but also Leonardo attached a profile for their Maddog as well as Aerosoft for their CRJ.

fslabs didn't release a profile. the a320 one was community made and that user didn't use the product anymore.

Watch this space AirlinerPerformance.net

Stephen, just wanted to link it lol!

http://airlinerperformance.net/aircraft-types/

Edited September 23, 20187 yr by kityatyi

Profiles available!

http://airlinerperformance.net already made them available!

Happy Flying! 😎🍺     Ups - at the same time....😅

Edited September 23, 20187 yr by Raphael_Chacon

14 hours ago, ph-cxz said:

fslabs didn't release a profile. the a320 one was community made and that user didn't use the product anymore.

No, actually FSLabs did release a profile.  It was made by a developer at FSLabs, Phillipe.

Flying the B748F at this time with new profiles from http://airlinerperformance.net    

So far extremely precise!... ✔️

I just did an almost 10hr flight using this new profile. Was 14,000lbs under estimated arrival fuel. The winds were pretty much spot on with the forecast and followed along with the flightplan. Think there needs to be work done on this one. For those using this profile, the weights for MLW and Empty weight are different than what PMDG has in their aircraft.cfg as well. If I keep coming in under I will have to add a percentage increase in the cruise fuel bias. 

EDIT: This was the pax version profile. 

Edited September 24, 20187 yr by B777ER

11 minutes ago, B777ER said:

I just did an almost 10hr flight using this new profile. Was 14,000lbs under estimated arrival fuel. The winds were pretty much spot on with the forecast and followed along with the flightplan. Think there needs to be work done on this one. For those using this profile, the weights for MLW and Empty weight are different than what PMDG has in their aircraft.cfg as well. If I keep coming in under I will have to add a percentage increase in the cruise fuel bias. 

EDIT: This was the pax version profile. 

It is a profile based on realworld data and not a template specific to PMDG.

Set a BIAS adjustment as required based on your experience along with PMDG weights and capacities.

43 minutes ago, srcooke said:

It is a profile based on realworld data and not a template specific to PMDG.

Set a BIAS adjustment as required based on your experience along with PMDG weights and capacities.

Gotcha. What do you suggest? 2 or 3% cruise bias for a approx 10 to 14k difference?

6 minutes ago, B777ER said:

Gotcha. What do you suggest? 2 or 3% cruise bias for a approx 10 to 14k difference?

Personally I monitor several flights, if there is a discrepancy does it occur in the climb,cruise or descent phase of flight.

Be sure to use the climb/cruise/descent profiles as planned in PFPX including CI.

When planning are using PFPX online weather or that sourced from the weather engine ( PFPX online been more accurate )

Having monitored the fuel difference from the flights apply an average bias adjustment.