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Pilatus PC-6 development topic

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Pilatus PC-6 development topic

Postby TheEagle » Thu Jun 09, 2022 5:44 pm

Hi everyone ! I've started some improvements to the Pilatus PC-6 from FGAddon, which is pretty much broken currently (FDM wise, it's YAsim). So, it'll get a JSBsim FDM, and some other things (moern effects, etc.)

Where can I get it ?

The modified version is on GitHub at https://github.com/TheFGFSEagle/pilatus-pc6-family

I already have a problem - for some reason I get an aggressive roll as soon as I go into the air … maybe someone can take a look at the FDM ? It's at https://github.com/TheFGFSEagle/pilatus ... h2-fdm.xml No idea what I was doing wrong - it's working fine now !
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Re: Pilatus PC-6 development topic

Postby Oswald » Thu Jun 09, 2022 9:47 pm

Hi Eagle,
I am much interested in this aircraft, have flown Detlef's version a lot.
Your version after starting via launcher as yet only gives me a yellow blue glider.
I put the whole thing into my folder, keeping the name "pilatus-pc6-family-master"
Any mistake?
Thanks, Oswald
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Re: Pilatus PC-6 development topic

Postby TheEagle » Thu Jun 09, 2022 10:22 pm

Hehe, this is the mistake all users make who use a aircraft from Git for the first time ! :lol: :wink: Remove the -master from the folder name, then it should work.
Note though that my version is currently in the alpha phase - so please don't complain about the propeller not working and the engine not starting ! :wink: What you can do already is take her for a glide by pressing Ctrl+u multiple times … or, if you want, you can start the engine the hard way:
  • In the property browser, navigate first to /engines/engine/n1 and shift-click that property - it's value will be displayed in the top-left of the FG window from now on.
  • Then set /controls/electric/engine/generator to true
  • Set /controls/engines/engine/starter to true - the engine will spin up to 20% N1. When it's there, introduce fuel into the engine by setting /controls/engines/engine/cutoff to false. When N1 reaches 50.6%, you're ready to go ! :)

By the way, there'll be new commits quite often - so rather than always downloading a ZIP archive from GitHub, it'd be more convenient to do
Code: Select all
git clone https://github.com/TheFGFSEagle/pilatus-pc6-family

in a terminal / console, which would also avoid the mistake you just did ! :wink:
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Re: Pilatus PC-6 development topic

Postby TheEagle » Mon Jun 13, 2022 10:30 pm

A small update - I've fixed part of the mess of the old version, so for now the propeller is animated correctly again, and part of the engine gauges are also working again. Additionally, I've fixed the FDM - something must've gone wrong when I generated it for the first time with AeroMatiC++ (it went spinning round as soon as it got some moving air under it's wings), but a regeneration resolved that. Also all normals are pointing into the right direction again.
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Re: Pilatus PC-6 development topic

Postby TheEagle » Tue Jun 28, 2022 10:08 am

I've just made the autostart menu item work again (though it really only starts the engine for now).
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Re: Pilatus PC-6 development topic

Postby TheEagle » Wed Jul 06, 2022 10:05 pm

Finally I've got an all-new VSP based FDM flyable ! I need to tweak the lift and drag a bit manually though because the model stalls 10 knots too late right now, which is caused by VSP not being able to simulate flow separation properly (huge thanks to Ysop for guiding me through VSP - it is my first time using VSP - and explaining to me the weird stall behaviour VSP produces and how to resolve that) Next thing is making the torque meter display the correct numbers (they are all over the place currently) and implementing the engine properly.
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Re: Pilatus PC-6 development topic

Postby TheEagle » Sun Jul 10, 2022 11:36 pm

Fixed the torquemeter and reimplemented the reverse thrust.
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Re: Pilatus PC-6 development topic

Postby TheEagle » Mon Jul 11, 2022 2:40 pm

Electrical system works again - it didn't because of a typo I did. The steerable tailwheel turns into the wrong direction right now which is why steering on ground is reversed - currently being investigated.
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Re: Pilatus PC-6 development topic

Postby TheEagle » Mon Jul 11, 2022 4:46 pm

TheEagle wrote in Mon Jul 11, 2022 2:40 pm:The steerable tailwheel turns into the wrong direction right now which is why steering on ground is reversed
now fixed !
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Re: Pilatus PC-6 development topic

Postby Oswald » Thu Jul 28, 2022 4:27 pm

Great aircraft, hopefully ...
Though, I don't get it started: After "starter" and "ignition" the oil pressure doesn't build up and the whole sequence is disrupted. Does work in the "old" version ...
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Re: Pilatus PC-6 development topic

Postby TheEagle » Thu Jul 28, 2022 8:29 pm

yeah, some of the cockpit controls don't work currently … for engine starting, please just use the Autostart function from the menu in the meantime. you then still have to switch on the generator, battery, lights, radios, …
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Re: Pilatus PC-6 development topic

Postby TheEagle » Thu Jul 28, 2022 10:30 pm

Generator and starter switches should work properly again - note though that the generator switch has to be set to on before starting the engine - else it simply won't start, due to JSBsim's turboprop implementation.
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Re: Pilatus PC-6 development topic

Postby TheEagle » Fri Jul 29, 2022 11:17 am

Condition lever and fuel shutoff valve work again, so the startup procedure is now more realistic:
  1. Battery ON (optional right now)
  2. Generator ON
  3. Nav, Beacon, strobe, instrument and panel lights ON (optional)
  4. Condition lever LOW IDLE
  5. Fuel valve ON
  6. Starter switch ON
The throttle has been also remapped - throttle 0.4 to 1 is normal forward power, to get into reverse you need to put the throttle to IDLE (0.4) and clear the detent by pressing the Delete key, then blade angle / reverse power is controlled between throttle 0 and 0.4. To get back out of reverse you need to put the throttle to IDLE REVERSE (0.4) and clear the detent with the Delete key again. :) I'll try to work out a solution for the ignition switch next.
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Re: Pilatus PC-6 development topic

Postby TheEagle » Sat Sep 03, 2022 8:24 pm

Been working on the 3D model recently - adding latest shaders and converting to knob / slider animations, etc. Will take some time.
Meanwhile, you can watch this 10 minute documentary on the PC-6 demonstrating some insanely short takeoff's and landings:

Looks like Ysop is right about the drag being way off …
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Re: Pilatus PC-6 development topic

Postby Ysop » Sat Sep 03, 2022 10:53 pm

Taking an absolute wild guess for the L/D: 11 With flaps 8.

If you have the POH: It will not given directly, but usually there is optimum glide speed given and an altitude / distance diagram.
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