434 THROTTLE AXIS MISMATCH CAUSES HOT ENGINE AT RAMP START
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25% you say… this explains why I always get a hotstart following the IRL checklist procedure - which is to introduce fuel above 20%, or max motoring RPM if that is less than 20% RPM (not a factor in BMS as pressure altitude in BMS doesnt seem to affect JFS motoring RPM).
The advice given in the forum back in 4.32 and 4.33 was to wake the throttle by moving it up and down before starting the engine. Realistically, even starting at 19.8% RPM should not have much chance of a hot start… but in BMS this is guaranteed.
The axismapping files perhaps are compatible; I havent checked. The OP didnt say he copied those from his original install anyway, so I assumed he was not aware that 4.34 is a standalone install.
no it’s not garanteed
below 15% , this is garantee
below 20 % this is a 70% chance
else this is a 2% chanceso startup between 20 and 25 (and even 25) is 2% chance.
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Then Im just having a very unusual series of rolls on that percentage table, I guess. I havent done hundreds of flights yet, though. So its possible, I guess.
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Then Im just having a very unusual series of rolls on that percentage table, I guess. I havent done hundreds of flights yet, though. So its possible, I guess.
are you using Analog detent or Keyboard detent ?
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Then Im just having a very unusual series of rolls on that percentage table, I guess. I havent done hundreds of flights yet, though. So its possible, I guess.
I suppose it’s not the problem, but still, on which block? Some, like the -52 and their engine, seem to hotstart when they actually don’t.
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Analog, Idle Cutoff, block 40
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Analog, Idle Cutoff, block 40
Do you systematically put full throttle and back prior to JFS start ?
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Well FTIT rise quickly after15% rpm and when at 20% engine is already on fire. Mayby its a calibration issue. Tonight I 'll try to reset to default and connect TQS via cougar Stick and calibrate it through CCP and then to follow the “wake up the throttle” procedure. Analog idle cutoff all blocks.
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Well FTIT rise quickly after15% rpm and when at 20% engine is already on fire. Mayby its a calibration issue. Tonight I 'll try to reset to default and connect TQS via cougar Stick and calibrate it through CCP and then to follow the “wake up the throttle” procedure. Analog idle cutoff all blocks.
Do you systematically put full throttle and back prior to JFS start ?
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Do you systematically put full throttle and back prior to JFS start ?
No not that often! I didn’t have such issues with 433. I 'll try some starts with wake up procedures tonight.
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No not that often! I didn’t have such issues with 433. I 'll try some starts with wake up procedures tonight.
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this is absolutly mandatory in 4.34 for those who use analog idle cut off
you must synchronize your throttle position before JFS start, therefore move full range up and down your throttle
you have of course a physical Detent ? (not the one in the cougar )
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Do you systematically put full throttle and back prior to JFS start ?
I systematically move the throttle before engine start. Im unsure whether to the stops - I move it until I see it move in the pit, then retract it fully. Part of the VERIFY check; Throttle - OFF.
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I systematically move the throttle before engine start. Im unsure whether to the stops - I move it until I see it move in the pit, then retract it fully. Part of the VERIFY check; Throttle - OFF.
So you should be safe
No spiking of your throttle ?
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Pretty sure not. I’ll do some more starts when I get a chance tonight and make sure it’s not just bad luck… I’m a bit busy atm
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No not that often! I didn’t have such issues with 433. I 'll try some starts with wake up procedures tonight.
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Follow procerures.
What the “Verify Check” is saying? …
THROTTLE: OFF
…
Follow procedures.
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The problem was simple and obvious…
Throttle position and calibration became sure enough more critical with 4.34.
As RD said….In 433 I was using only the cut off position as a detent fixed at the second mechanical detent of the TQS leaving the idle position just a bit lower of the first mechanical detent. In 434 I have to fix idle analogue detent to first mechanical click of TQS so that the second one is the off position. Now I have no hot starts no mater if I push to idle at 20 or 25 rpm and no matter if I wake up the throttle or not.
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I systematically move the throttle before engine start. Im unsure whether to the stops - I move it until I see it move in the pit, then retract it fully. Part of the VERIFY check; Throttle - OFF.
This is correct and has been the case for a long time. Since at least 4.32.
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er… I know. Ive been doing the VERIFY check since then.
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Then Im just having a very unusual series of rolls on that percentage table, I guess. I havent done hundreds of flights yet, though. So its possible, I guess.
Ive done a few starts tonight which are working as expected. Perhaps Ive just had some bad luck; that, or introducing fuel before 20% somehow?
Seems to be working now though.