whamil77

Carenado PA31T Cheyenne II Mod v3.1

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Updates in version 3.1

 

1. Fixed a problem with the Main Attitude Gyro that would cause it to occasionally freeze.

2. Fixed the power to the Main Attitude Gyro that correctly controls it from the Avionics Master Switch rather than the Battery Switch.

3. Fixed a problem that would inhibit engine start if using the Avidyne EX500 and the Carenado GNS530.

4. Updated the autopilot*

 

* Note: There are still issues with the autopilot.  I am resolving those issues while developing a mod for the Carenado Cheyenne III.  This update has some interim corrections but is not the final product.  The final version will be provided along with the Cheyenne III/IIIA.

Update in your emails.

 

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Outstanding Bill, your work is greatly appreciated! Great to hear you're doing something with the Carenado Cheyenne III.

Cheers Bill
Andrew

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Thank you for the update, Bill.  Enjoying flying this bird.

Stew

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Thanx a ton, Bill! Didn't install your latest mods yet due to some personal issues but will sure do in the near future. It's absolutely fantastic to have a decent Cheyenne (optical -kudos to Carenado and technical - a thousand kudos to you) in P3D as it was always my favourite twin engine plane.

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Two questions:

1. During start up, shortly after starting the second engine (the order doesn't appear to make a difference) the engine I started first will slow way down and the oil temp comes up as though there's a heavy load on the engine.  I've followed the procedure in the POH and I've performed some variations with different bus tie and generator configs and even with the bus ties and gen off it still winds down. It comes back up again and I can keep doing more testing to try and isolate the issue but it seems odd to me. Am I the only one experiencing this?

2. Would it be possible to include a GPU in a future update? If you don't start an engine very quickly after powering up the aircraft, you will not have enough battery power to start an engine.  This morning I tried to simply put my route into the GNS before starting up and it had already drained the batter down to ~22v.  This also brings to mind the question as to whether or not I should be using FSUIPC's battery life function.  I am currently not since most of the planes I fly circumvent that inherently, however, the Cheyenne seems to suffer from a pretty short battery life.  Would using that facility help and would it cause any potential conflicts with the mod?

Loving the mod otherwise. I really can't say enough; it's fantastic work.

Ian

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9 hours ago, Eyaen said:

Two questions:

1. During start up, shortly after starting the second engine (the order doesn't appear to make a difference) the engine I started first will slow way down and the oil temp comes up as though there's a heavy load on the engine.  I've followed the procedure in the POH and I've performed some variations with different bus tie and generator configs and even with the bus ties and gen off it still winds down. It comes back up again and I can keep doing more testing to try and isolate the issue but it seems odd to me. Am I the only one experiencing this?

2. Would it be possible to include a GPU in a future update? If you don't start an engine very quickly after powering up the aircraft, you will not have enough battery power to start an engine.  This morning I tried to simply put my route into the GNS before starting up and it had already drained the batter down to ~22v.  This also brings to mind the question as to whether or not I should be using FSUIPC's battery life function.  I am currently not since most of the planes I fly circumvent that inherently, however, the Cheyenne seems to suffer from a pretty short battery life.  Would using that facility help and would it cause any potential conflicts with the mod?

Loving the mod otherwise. I really can't say enough; it's fantastic work.

Ian

I have not seen the engine issue.  Ensure that the first engine has been set to at least 68% prior to engaging the generator.  Ensure the generator load has decreased to below 100 amps prior to starting the second engine. 

 

Here is what I have figured out so far about the battery problem. 

Carenado did not map the electrical system in the aircraft.cfg file other than to specify battery voltage, generator voltage, and generator output.  When I looked at the battery voltage and load variables I found the following:

Battery Switch - ON = 5 amps out of the battery

Avionics Switch + Battery switch - ON = 20 amps out of the battery with the voltage falling rapidly.

I copied the electrical loads from the Alabeo Cessna 310 and inserted them into the Cheyenne II aircraft.cfg.  Now I get the following:

Battery Switch - ON = 2 amps out of the battery

Avionics Switch + Battery switch - ON = 7 amps out of the battery with the voltage falling very slowly.

I guess the moral of the story is that if one doesn't specify electrical loads in the aircraft.cfg, P3D assumes default values that are quite high. 

I will put external power in the next update, but in the interim place the following in the aircraft.cfg in place of the current electrical system and see how it goes:

[electrical]
max_battery_voltage = 24
generator_alternator_voltage = 28
max_generator_alternator_amps = 500
engine_generator_map= 1,1
electric_always_available = 0
avionics_bus       = 0, 5 , 17.0
additional_system  = 0, 2 , 17.0

Regards,

Bill

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Thanks Bill, I will give this a try.

The odd thing about the engine loading is that there is no systems logic behind it. I.e. The gen isn't on and furthermore the bus ties are off.  The second engine starts just fine on battery power alone after it's been re-charged after the initial engine start as per the POH. The first engine should sit and run happily. An odd bug indeed.

Something I just thought of though- I'm going to closely monitor battery voltage next time and see if the drop in battery voltage corresponds with the slowing of the engine. I have a sneaky suspicion that it will.

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