Re: [Flightgear-devel] Problem restarting YASim aircraft after fuel starvation

[Gary N. <gr...@gm...>]

Stuart,

Hopefully others will also confirm, but I'm fairly certain fuel.nas is
used only for YASim support. I always swap it out with my own custom
routines since it's limited and problematic, but it's useful for early
prototyping support. Without it there are no default routines to reset
the fuel-consumed-lbs property under engines.

Also it's not needed for YASim aircraft lacking normal YASim engine
support, such as sailplanes or helicopters. It might be nice if there
was an easy way to disable it in such cases, perhaps a simple /sim
property that if set, prevents fuel.nas from initializing. I'm
thinking fuel-freeze wouldn't serve that purpose well since custom
engine/fuel routines (helicopters) might use that property.

My $.02 thoughts.

-Gary aka Buckaroo


On Tue, Dec 20, 2011 at 4:16 PM, Stuart Buchanan <stu...@gm...> wrote:
> Hi All,
>
> I'm investigating
> http://code.google.com/p/flightgear-bugs/issues/detail?id=526, which
> appears to be a long-standing bug that after fuel starvation it isn't
> possible to restart YASim engines.
>
> The problem appears to be in fuel.nas line 25, which drops out from
> making any fuel calculations if the engines aren't consuming any fuel.
> Unfortunately this means that there's no opportunity to reset the
> out-of-fuel flag.
>
> I think this line is also intended to drop out for FDMs other than
> YASim, which don't use fuel.nas, but instead have their own fuel
> management.
>
> Can anyone confirm that fuel.nas is only used by YASim?
>
> If so, I'll change the FDM initialization listener to simply never
> start the update loops for FDMs other than YASim, and remove the code
> that drops out.
>
> -Stuart
>
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