lukehall

Thanks Spin737 - I must admit that I failed to follow the check list fully and omitted to operate the fire handle for the engine in question. I just tried to recreate the problem and without success - So I guess I'll chalk it up to 'one of those things'! Thanks for your help though. :-)
 
Luke

Thanks for your advice. The repair did not work but I have solved the problem after creating a new .cfg file, running FSX then replacing it with my previous file. I don't know why it fixed it but it did!
 
 
I guess if I want a nicer overall look, then P3D beckons! I just can't face the prospect of setting up a completely new sim with all of my addons and configurations, so I'm going to stick it out with my FSX setup until it dies!
 
Cheers!

Hi Again Damian,
 
I have checked my system now and can confirm that the file I am looking at is the one you have refered to. There are no other instances of that file on my PC.
 
Best wishes,
 
Luke
 
P.S. Sorry for spelling your name incorrectly on my first reply!

Thanks Kyle.
To expand a little on my thoughts... If both FADECs were commanded to produce exactly the same N1 performance at exactly the same time, by the time the command was translated into fuelling variations in the turbine, all sorts of other asymmetry factors will have come into play and influence each engine's performance in slightly different ways. In reality, the FADECs will measure the commanded N1 value from the throttle or auto throttle input and make tiny instantaneous adjustments to keep N1 at the commanded value, in a continuous feedback loop. However, the turbine components, particularly the front end fan have huge inertia and therefore it is never possible to completely and perfectly synchronise two or more engines all of the time - the nearest thing is continuous and multiple FADEC corrections to give the appearance of synchronisation, particularly when they are being continuously affected by environmental and mechanical factors which differ both internally and externally for each engine.
 
That's the tech stuff! The simple result is that you'll always observe slight variations between all values of more than one engine compared to each other and I was wondering if this element was simulated realistically. The PMDG NGX does it very well, creating the very convincing illusion that you are monitoring two completely independent pieces of engine hardware :-)
Of course, as you elude to, if the throttle levers are not commanding the same fan speed value, you'd expect to see the variation between the engines. My question is really asking about variation between the engines when the throttles are exactly (or as near as possible) the same. You could also look at it like this... For a given constant throttle position on one engine alone, you should expect to see occasional fluctuations in N values for all of the influencing factors mentioned above.
P.S. Liked your video!
Luke