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FSXA Startup spool time

N

nauwa

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5
Country
sweden
Hi, I would like to change the startup spool time on a jet engine. Today, it takes less than 20 seconds to reach idle, but in the real aircraft it takes 40-45 seconds from the start switch is pressed till idle is reached.

I have tried to fiddle with the "fuel flow gain" value, where lower values give longer spool times, but that also makes the engine spool time above idle to be to slow.

So, my goal is to keep fast spool times between idle (N2 at 59%) and full power, but with a slow and steady spool time from 0 to 59% N2

Is this possible to do, and do someone of you wizards have any hints where I should begin?

Thanks in advance
Johan
 
I recall several quite recent threads on this subject in this forum. I can't remember their titles but a search should find them.
 
Thanks,

I've seen that topic, and others too when searching this forum.
Still got no sucess. No matter how I change the x-value below my idle (N2 59%). It always take about 20 second to reach idle after engine start.
Above idle, I get different spool time when I change x-value.

I'm totally new to this, as I'm more into simulator hardware, and english isn't my first language either...

Regards
Johan
 
You might try writing Oleksiy at Majestic Software Support. He did the Majestic Q400 which I think has a proper spoolup time. He should probably know how to aquire proper startup times.

support att majesticsoftware dott com
 
I believe the Majestic Q400 does not use any of the default FS variables/ .air file entries.
 
Their flight and engine model is completely exterior to FSX.
 
Flatten the slope of the below idle segments by increasing the number of x units in those segments.

Add a number of x units to the below idle segments, while only adding the total added units to the above segments.


For example, if each segment was ten x units and we had five segments:

0% x=10
60% (idle) x=20
70 x=30
80 x=40
90 x=50
100 x=60

let's say we double our idle segment:

0% x=10
60% (idle) x=30
70 x=30
80 x=40
90 x=50
100 x=60

now our idle segment is from x=10 to x=30 instead of 10 to 20. so it is now twice as long. But the problem now is we have two x=30:

0% x=10
60% (idle) x=30
70 x=30
80 x=40
90 x=50
100 x=60

so add ten to all non idle segments, keeping their distance 10 x units.

0% x=10
60% (idle) x=30
70 x=40
80 x=50
90 x=60
100 x=70


Now, each segment is still 10 units of time apart, but the spool segment is doubled in time length: x = 20 units.


Note: The time affected in spool is ONLY AFTER ignition. Time from ignition to idle, not time from starter to idle. The time from starter to ignition is based on the fan tables and hard coded.
 
also remember a segment is to/from.

0%CN2 to idleCN2 in the example above is one segment. It will take X units of time to transition the entire length of the segment. This is assuming a constant throttle setting and interpolation is accounted for.
 
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