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Helicopter rotating on ground

Postby samsonavionics » Sun Jun 12, 2016 11:53 am

My helicopter is rotating on ground at startup. That shouldn't be, right?

My system: Linux FlightGear Version 2016.2
Last edited by samsonavionics on Sun Jun 12, 2016 2:22 pm, edited 1 time in total.
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Re: Helicopter rotating on ground

Postby Alant » Sun Jun 12, 2016 1:00 pm

Please give a few more details
- which helicopter, fg version etc would help.
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Re: Helicopter rotating on ground

Postby StuartC » Sun Jun 12, 2016 1:31 pm

sounds like the ground friction bug
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Re: Helicopter rotating on ground

Postby FlugHund » Sun Jun 12, 2016 2:02 pm

My thought as well. One has to compensate this with tail rotor. There's also a patch available which never made it into the code. The name's "stiction.diff", which should be found when searching the devel mailing list. Sadly it sometimes causes troubles with planes, though.
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Re: Helicopter rotating on ground

Postby StuartC » Sun Jun 12, 2016 2:07 pm

What heli is it?
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Re: Helicopter rotating on ground

Postby samsonavionics » Sun Jun 12, 2016 2:21 pm

@StuartC every heli, like Eurocopter helis, bo105, ..........
@FlugHund: Do you recommend to rebuild flightgear with this patch?
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Re: Helicopter rotating on ground

Postby FlugHund » Sun Jun 12, 2016 3:15 pm

Well, not exactly recommend. Depends on if you do not fly planes or can live with them get stuck once in a while when parking them on grass.
Usually compensation with 0/Enter when on ground does the trick. If other input devices are interfering with the keyboard input, I have a key binding here which en-/disables this axis.

Code: Select all
 <key n="181">
  <name>AltGR-m</name>
  <desc>Toggle Joystick Axis on/off</desc>
  <repeatable type="bool">false</repeatable>
  <binding>
   <command>nasal</command>
   <script>
     var node = props.globals.getNode("/input/joysticks/js/axis[3]/binding/property", 1);
     if ( node.getValue() == "/controls/flight/rudder" ) {
       node.setValue( "" );
     } else {
       node.setValue( "/controls/flight/rudder" );
     }
   </script>
  </binding>
 </key>


If you fly planes and helis and neither compensating nor patching is to your likes, having two versions of FG installed might do the trick. A patched and an un-patched one. I've done that in the past but nowadays I just compensate.
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Re: Helicopter rotating on ground

Postby wkitty42 » Sun Jun 12, 2016 6:14 pm

i had the UFO spinning like crazy... it was actually in a flat spin because when i switched to an external view, it was on its side embedded in the terrain... for some reason i flipped my joystick about its axis' and it straightened out... i had rebooted the machine and i'm guessing that the joystick was feeding invalid data to the sim until i moved the stick...
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: Helicopter rotating on ground

Postby VicMar » Mon Jun 13, 2016 7:03 am

wkitty42 said,
i had the UFO spinning like crazy
I get that often. Just switching to cockpit view (Joystick trigger) cures it every time.

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Re: Helicopter rotating on ground

Postby samsonavionics » Fri Jun 17, 2016 7:43 pm

I think it is really importating to hold the heli at the same position, when it is on ground. It is much more realistic AND easier to start and land.

The landing is really hard, when the heli slips on the ground. I think on recompiling FG with the patch.
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Re: Helicopter rotating on ground  

Postby jaxsin » Fri Jun 17, 2016 8:58 pm

it's pretty realistic that a Heli would spin until it was sitting 'hard' on the ground anyway(w/out some form of compensation from the pilot). Not sure how compiling FG with said patch is going to make landing any easier.
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