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 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
