Thanks David,
Yes. I've actually had the "pleasure" of pushing a crate with a shonky donk 
back to the hanger.

:)

Drew


On Friday 05 October 2007 22:34:26 David Megginson wrote:
> On 05/10/2007, drew <[EMAIL PROTECTED]> wrote:
> > In "real life" flying of the Cessna 172/152/150, you run the engine up to
> > 1700 rpm then check the health of each ignition system by switching off
> > the left then right magnetos in turn and watch for a corresponding drop
> > in rpm (typically 50-75 rpm). This drop in revs does not seem to be
> > simulated in FG in any piston engined aircraft that I have tried.
> > This is not a complaint, just an observation. Can this be simulated in FG
> > (or am I just a silly old pedant).
>
> To make things more interesting, the drop is much more dramatic when
> you do the check with the mixture heavily leaned, so you don't just
> want to hardcode a 50rpm drop when there's just one magneto selected.
>
> For the non air-heads, each cylinder has two spark plugs, one
> connected to each magneto (e.g. two independent ignition systems);
> when you select only a single magneto, one of the spark plugs in each
> cylinder doesn't fire, and the overall power output drops very
> slightly.  If there's a problem, however -- say, one of the plugs is
> lead-fouled -- the engine will start running *very* rough, since it's
> dragging a dead cylinder.
>
>
> All the best,
>
>
> DAvid
>
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