JPT in MIL power to high?

[gulredrel]

Hello,

 

as mentioned in Chuck's Guide for the F1 thread, I wanted to start a clarification thread regarding JPT of the F1:

The official manual in the aircraft folder doesn't show any numbers regarding max., max. continuous or other normal / abnormal values.

Chuck's Guide has this values:

JPT
(Jet Pipe Temperature) Limits
In Idle, Military and Afterburner power settings
- 740 - 755 deg C Maximum when on ground
- 760 deg C Maximum when in flight
- 735 deg C in overspeed

Here my findings with screenshots coming from the track attached, runway hot takeoff 15°C OAT, standard pressure setting, so JPT regulator should have been in auto mode. Don't have a track but last week I had a flight with the regulator switch in different positions, there was no difference.

Looks like any MIL power value in different flight altitudes is above the limits described above.

As damage from too long compressor stall conditions is simulated, are there also problems from overtemp conditions? Can you please clarify the values with no AB but near MIL power?

Short spikes from AB ignition is normal I guess, so behavior with AB running looks okay.

14000ft AB 760°C --> ok

17000ft 8300rpm 790°C --> needs to be checked?

17000ft MIL 8400rpm 820°C --> needs to be checked

17400ft AB ignition 850°C, short temp spike

16300ft AB stabilized 770°C

28000ft AB ignition spike 880°C

28400ft AB normal 760°C

30400ft AB 8900rpm overspeed normal 725°C okay

30700ft MIL after reducing speed to below M1.4 820°C

Thanks

Jens

F1CE_JPT_mil_and_burner_and_overspeed_DCS_2.8.8_OB.trk

[fausete]

Thanks for the report. We will check. Overtemperature damage is simulated but these temperatures won't be enough to trigger it. Opening the fuel feed to the engine and moving the throttle to idle before start up will cause overtemperature damage, for example.

[Loukuins]

I will add some informations from a another thread that I posted in :

For the max temps it's allowed to have 840°C for an instant and 780°C for 30sec max (this is what I found), and can't go higher than 900°C during startup, also in with AB the max temps at 8900RPM (So in Overspeed mode of the Engine) the temps should be below 735°C.

[gulredrel]

2 hours ago, fausete said:

Thanks for the report. We will check. Overtemperature damage is simulated but these temperatures won't be enough to trigger it. Opening the fuel feed to the engine and moving the throttle to idle before start up will cause overtemperature damage, for example.

On startup, yes, I know this has been changed from initial release.

Thanks for checking.