It makes me wonder if some other control is battling for the starter
property and it's not consistently switched on?
On Fri, Jun 1, 2012 at 2:46 PM, Viktor Radnai <[email protected]>wrote:
> Actually the engine rpm is usually oscillating between 430 and 450 rpm.
> Therefore it must be shutting down and starting up repeatedly, or at
> least I think that's what's happening. Also it could be possible that
> when the starter engages, it might pull the rpm back momentarily.
>
> In any case, I just did a couple more tests and this time around the RPM
> slowly increased past 460 and then the engine managed to start. But it
> seems to take a random amount of time before that happens, so perhaps
> the wind might be helping out. Or it could be something related to the
> timing of the UDP control packets, I really have no idea.
>
> Anyway, I'll give the new code a go at some point, it's about time I
> rebuilt from git again.
>
> Cheers,
> Vik
>
> On 06/01/2012 09:16 PM, Ron Jensen wrote:
> > There is a change to the starter motor code (should be entering git real
> soon
> > now) that may help address this. But your engine should have 'started'
> as it
> > exceeded 440 RPM... Anyway, glad it works now, and we can revisit this
> after
> > FlightGear syncs JSBSim.
> >
> > Ron
> >
> > On Friday 01 June 2012 09:39:52 Viktor Radnai wrote:
> >> Hi Ron,
> >>
> >> A quick test confirms that you were indeed right:
> >>
> >> Engine state: 0, mag: 3, starter: 1, RPM: 440.915466
> >> Engine state: 0, mag: 3, starter: 1, RPM: 440.567566
> >> Engine state: 0, mag: 3, starter: 1, RPM: 447.837677
> >> Engine state: 0, mag: 3, starter: 1, RPM: 445.897156
> >>
> >>
> >> It must be that the periodic engaging and disengaging of the starter
> >> makes it impossible to reach 550 rpm. If I also press 's' in Flightgear,
> >> the engine will start immediately. Also if I reset the game and the prop
> >> is still turning, it will start.
> >>
> >> I do find it a bit odd how the starter was implemented. I wonder if it's
> >> feasible to change it so it keeps running until a starter_power=0 is
> >> received. In the meantime I might just change the idle RPM to 440 in my
> >> copy so I'm able to start the engine.
> >>
> >> Thanks for your help!
> >>
> >> Cheers,
> >> Vik
> >>
> >> On 06/01/2012 02:16 AM, Ron Jensen wrote:
> >>>> From eng_io320.xml:
> >>>
> >>> <idlerpm> 550.0</idlerpm>
> >>>
> >>> The engine needs to reach 440 RPM to start (80% of 550, the coded idle
> >>> RPM) if you're reaching above 440 RPM make sure you've engaged fuel and
> >>> magneto controls. If you're not reaching that perhaps you need to look
> >>> into the controlling nasal as the c172 uses some non-standard stuff.
> Also
> >>> make sure you're not sitting with a strong tailwind as that can affect
> >>> some propeller configurations and make them harder to turn.
> >>>
> >>> Ron
> >>>
> >>> On Thursday 31 May 2012 15:16:42 Viktor Radnai wrote:
> >>>> Hi all,
> >>>>
> >>>> I'm going to use Flightgear for developing/testing UAV code (yep,
> >>>> another one of those :) ). I'm currently putting together an SDL app
> >>>> that communicates with FG.
> >>>>
> >>>> I'm using the FGNetCtrls structure from net_ctrls.hxx. I'm trying to
> >>>> start the C172's engine but when I set startup_power = 1, the engine
> >>>> tries to start, but won't. Flightgear behaves like I was repeatedly
> >>>> pressing the 's' key several times per second rather than holding it
> >>>> down, so the engine spins up, but not quite enough to start. Am I
> doing
> >>>> something wrong?
> >>>>
> >>>> Thanks for your help in advance.
> >>>>
> >>>> Cheers,
> >>>> Vik
> >
> >
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--
Curtis Olson:
http://www.atiak.com - http://aem.umn.edu/~uav/
http://www.flightgear.org - http://gallinazo.flightgear.org
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