Do engines shut right down after you've pulled the Engine Cutoff Knobs/Levers? I'm asking because... I'd think that there would still be fuel being in the lines still shortly after, thus causing a delay....So is it instant?Voice answers please!

They work just like mixture on a piston engine, they shut down nearly teh second you cut them

Voice answers?Shall we call you to reply?

Do engines shut right down after you've pulled the Engine Cutoff Knobs/Levers? I'm asking because... I'd think that there would still be fuel being in the lines still shortly after, thus causing a delay....So is it instant?Voice answers please!

There are 2 shutoff valves pr engine. One is the fuel spar shutoff valve which is located at the engine wing mounting and the other is the engine fuel valve located on the engine itself (at the exit from the hydro mechanical unit - the unit that regulates how much fuel is delivered to the engine). As the engine start levers (thats their name) control both valves and the shutdown is quite instantaneous. For the fuel to ignite properly it needs to be delivered under pressure and as soon as the pressure is removed by shutting off the valve the engine will start to spool down even if there is still fuel in the line.

There is actually a slight delay before anything registers on the DUs - we have engine start and shutdown really precisely modelled on the NGX. A bunch of real starts and shutdowns were recorded on video and matched. We think this is the best representation of a modern turbofan start process that's been done in FS to date.

There is actually a slight delay before anything registers on the DUs - we have engine start and shutdown really precisely modelled on the NGX. A bunch of real starts and shutdowns were recorded on video and matched. We think this is the best representation of a modern turbofan start process that's been done in FS to date.

Ryan, are the start ups and shut downs just "recordings" of what you saw (i.e. There are a handful of startups that "might" show up based on random events) or is it modeled to start up based on eviornmental aspect (i.e. If you start it when it is 30F outside, your ITT will be relativly low compared to starting in 90F with an engine that just was shut down)Ken Nesbitt

Voice answers?Shall we call you to reply?

It's a figure of speech.Heh.Thanks for the replies guys! Much appreciated!

There is actually a slight delay before anything registers on the DUs - we have engine start and shutdown really precisely modelled on the NGX. A bunch of real starts and shutdowns were recorded on video and matched. We think this is the best representation of a modern turbofan start process that's been done in FS to date.

hah I don't believe - prove it! [insert youtube video link to pmdg engine start/shutdown here]. all these wild claims need to be subtstantiated. ;)

Ryan, are the start ups and shut downs just "recordings" of what you saw (i.e. There are a handful of startups that "might" show up based on random events) or is it modeled to start up based on eviornmental aspect (i.e. If you start it when it is 30F outside, your ITT will be relativly low compared to starting in 90F with an engine that just was shut down)Ken Nesbitt

Ken, although I do not know the answer for sure I can guarantee that there is a 99.99999999999999999999999999999999999999999999999% chance the recordings were used as a reference to program the simulation; not be randomly pulled up during any given start. The engines on the NGX should respond based on environmental aspects. This already holds true for the MD11 as you'll notice higher EGT's on hot days. I believe Ryan meant the videos were used to refine the realism of the sim.