Re: [Flightgear-devel] a few more bugs

[Ron J. <wi...@je...>]

On Wed, 2009-01-07 at 17:34 -0700, John Denker wrote:
> 77:: In the default c172p model, sitting on the runway at KSFO, at
> full power the engine consumes about 78 pph of fuel. So far, so good.
> 
> Now stop the engine by pulling the mixture to cutoff. I observe that
> the fuel flow, as reported by the FDM via the property tree, settles
> above 8 pph. That’s more than a gallon per hour, with no mixture and
> no revs. That seems like rather a large leak.
> 
> Similar phenomena have been observed in other aircraft models.

In the code FuelFlow_gph is the canonical property, FuelFlow_pph is only
calculated when we actually consume fuel.  Slamming the mixture to 0 at
a high fuel flow rate causes consumption to stop leaving the
FuelFlow_pph value unable to update and stuck indicating a high value.

If you'll notice, fuel is not actually flowing, its just an incorrect
indication.

Ron