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Pilot's Handling Notes for a Savoia Marchetti S.73 with Piaggio X/RC35 engines
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The three 625hp Piaggio P.X/RC35 (Gnome Rhone GR9 Mistral) engines have automated mixture controls, and manually applied carb heat controls. Superchargers deliver rated power up to 3500 metres.
Each engine can be overboosted briefly to deliver 650hp for go around below 3100 metres.
WARNING - restrain RPM < 2250 at all times
WARNING - Full throttle cruising below 4500 metres is FORBIDDEN
AUTOMIXTURE - This engine has Automixture in real life. Turn automixture ON in the FS9 realism screen before flight.
This aircraft is loaded by default with 4,410 pounds of AVGAS to allow the longest routes flown in real life to be flown in FS9.
Design cruise altitude is 4000 metres. This variety of S.73 was capable of econ cruising at 5Km, but it seems that the oxygen supply was inadeqaute for continuous cruising at that level. Flight above 4Km should be retricted to 30 minutes per flight to climb briefly above weather or mountains.