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1.964 Minor glitches

 
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Banananav



Joined: 08 Oct 2015
Posts: 84
Location: 5nm West of RAF Cranwell

PostPosted: Mon Feb 17, 2020 4:39 pm    Post subject: 1.964 Minor glitches Reply with quote

Hi Mark

Just installed 1.964 and, as well as the CDU issue, found that:

There was a 5 sec delay between introducing fuel at 25% N2 and light-up, with 1.961 it was instantaneous.

When VOR 1 & 2 selected no ident or range shows on ND, but in this case ILSs were working and displaying correctly on PFD. Also ADF shows correctly on ND when ADF1 selected.

Thanks

Chris
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Chris Finn

Jetmax 737-800 & TQ
P3D 4.5 HotFix2
S-A 1.964
FSUIPC 5.152
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gsumner



Joined: 06 Feb 2016
Posts: 173
Location: WSM UK

PostPosted: Fri Feb 21, 2020 11:42 am    Post subject: Reply with quote

I think the ignition delay is intended as close to realistic engine lighting.

You'll notice a delay between turning the start switch and start valve open caption too.

Graham
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Banananav



Joined: 08 Oct 2015
Posts: 84
Location: 5nm West of RAF Cranwell

PostPosted: Fri Feb 21, 2020 12:27 pm    Post subject: Reply with quote

Thanks Graham

In my real-world experience a 5 second delay between introducing fuel and light-up is way too long for a jet engine.

With the igniters going you should get almost instantaneous tgt rise when you open the fuel valve.

This is how 1.961 works.

Rgds

Chris
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Chris Finn

Jetmax 737-800 & TQ
P3D 4.5 HotFix2
S-A 1.964
FSUIPC 5.152
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gsumner



Joined: 06 Feb 2016
Posts: 173
Location: WSM UK

PostPosted: Fri Feb 21, 2020 1:20 pm    Post subject: Reply with quote

I work for Roll-Royce. I don't work on the test bed but I've sat in on runs. Nothing is instantanious but i looked it up with Boeing.

https://www.boeing.com/commercial/aeromagazine/aero_02/textonly/sy01txt.html

It says the systems allows up to 15 seconds for the temperature to start to rise. If it doesn't it considers it to be a wet start and closes the fuel cock. Im guessing here they dont expect instantanious ignition. Im not sure how accurate SA is but even up to 15 seconds would be acceptable according to Boeing.

Graham
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MichaelYSSY



Joined: 06 Jan 2015
Posts: 694
Location: Sydney - Australia

PostPosted: Fri Feb 21, 2020 1:58 pm    Post subject: Reply with quote

Chris

Just to clarify, the delay that Mark introduced is from when you move the fuel levers to how long it takes the fuel valves to open. (you can observe this process on the OH fuel valve indications)

Once the fuel valves open the ignition is pretty much instantaneous.

Okay, just had a look at a video on YouTube with a 737 engine start. From Fuel lever movement to idle to actual fuel flow/egt indication is aprox 4 seconds. So I believe Mark got it pretty right Smile

https://www.youtube.com/watch?v=tS_dHxSt8sc&feature=youtu.be&fbclid=IwAR2UwL9CvLtWXzisYBpBdLhessWOu-TgerdXMYTjeQu7zqILmz2r58fXK8Y

Have a look at video about 3:15 into video.


Cheers
Michael
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SSTD 737
Sim-Avionics v1.96
P3D 4.5
FSUIPC 5.154


Last edited by MichaelYSSY on Fri Feb 21, 2020 2:16 pm; edited 1 time in total
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MichaelYSSY



Joined: 06 Jan 2015
Posts: 694
Location: Sydney - Australia

PostPosted: Fri Feb 21, 2020 2:14 pm    Post subject: Reply with quote

Just on another little adjustment.

Great work on the Engine Stable indications.

Mark, you're a genius.

Thank you
Michael
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Banananav



Joined: 08 Oct 2015
Posts: 84
Location: 5nm West of RAF Cranwell

PostPosted: Fri Feb 21, 2020 3:31 pm    Post subject: Reply with quote

OK, I'l give you 2.5 to 3 secs to light up, but not 5 !

Chris
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Chris Finn

Jetmax 737-800 & TQ
P3D 4.5 HotFix2
S-A 1.964
FSUIPC 5.152
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MichaelYSSY



Joined: 06 Jan 2015
Posts: 694
Location: Sydney - Australia

PostPosted: Fri Feb 21, 2020 4:44 pm    Post subject: Reply with quote

Chris

Fair enough, I was stretching 4. Smile

Maybe if Mark puts it in as an adjustable Server item?


Cheers
Michael
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