Re: [Flightgear-devel] another fuel change...

[syd a. <ada...@gm...>]

Yes , thanks Gary. I'll do some experimenting here ...  that'll be
great if i can trim down my own fuel routine.

On Mon, Feb 28, 2011 at 9:17 PM, Gary Neely <gr...@gm...> wrote:
> On Mon, Feb 28, 2011 at 10:27 PM, syd adams <ada...@gm...> wrote:
>> Me again ...
>> As Heiko mentioned , my S76C broke due to a fuel.nas change . If the
>> change was mentioned here , I guess i missed it completely.
>> After some experimentation, I finally got it running again ...it
>> wouldn't start due to empty tanks , and trying to fill them with the
>> dialog didn't work ....they would immediately snap back to 0.I removed
>> my nasal fuel routine , and everything worked again ,except with no
>> fuel consumption now... would I be correct in assuming that I only
>> have to supply the amount of fuel consumed per frame and fuel.nas will
>> manage the fuel flow ?
>> Thanks agaian,
>> Syd
>
>
> Syd,
>
> I don't have the latest and greatest fuel.nas so there may be changes
> that affect the following: in general for a conventional YASim
> aircraft with one or more engines, the FDM increments each engine's
> fuel-consumed-lbs every frame (or whatever update period it is using),
> and that value continues to increase until fuel.nas (or whatever) does
> something with it. Typically it iterates over each engine, copies the
> fuel-consumed value, decrements the amount across the tanks (the
> default is a cross-feed like system), and resets the fuel-consumed
> value to 0.
>
> Since a YASim helicopter doesn't use a standard defined YASim engine,
> if you provided code that continually increments an 'engine'
> fuel-consumed-lbs value (or some other fuel-consumed value you define)
> and pointed fuel.nas to that value, you should be able to get it to do
> the rest. It's a little different from directly managing fuel levels
> in tanks the way I think you used to do the s76c. In that case you
> directly decremented tanks, here, you'd kinda do the opposite--
> increment a fuel-consumed value, feed that to fuel.nas, and let it do
> it's tank-management thing.
>
> Hope this makes some kind of sense and is useful.
>
> -Gary
>
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