Spitfire/Seafire with contrarotating props
Just curious, but does your manual include the numbers for that idle setting? IIRC the Shack used an idle around 1200 rpm while the original Spit Griffons were more in the 600-700 rpm range. The compromise was somewhere in between. I have always wondered why other Griffon types could handle the lower idle rpm but this one had to use a higher setting.
