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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.
CAUTION - This aircraft has fragile flaps.
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Take Off:
AUTOMIXTURE = ON (in FS9 realism options)
FLAP = STAGE 1
CARB HEAT = COLD
TRIM = NEUTRAL
LINE UP
BRAKES = ON
THROTTLES = FULL
BRAKES = OFF
YOKE = FULL FORWARD to raise tail
TAIL UP - ROTATE FIRMLY
RESTRICT CLIMB <= 3 m/s VSI
ACCELERATE = 150 KmIAS
FLAP = UP
ACCELERATE = 190 KmIAS
WAIT FOR > 3 m/s VSI
Call for Rated power
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Rated power:
Plan 930 PPH
Ata = 1.033
190 KmIAS
ABOVE all obstacles
Call for Climb power
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Climb power:
Plan 840 PPH
Ata = 0.95
200 KmIAS
On reaching 4000 metres
Call for design cruise power
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Max Cruise (4Km and above ONLY):
Ata = (max) 0.866
Plan 720 PPH
Note: Yields 178 KTAS at FL131 (4Km)
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Design Cruise:
Ata = 0.766
Plan 600 PPH
Note: Yields 162 KTAS at FL131 (4Km)
Note: Yields 167 KTAS at FL164 (5Km)
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Econ Cruise:
Ata = 0.7
Plan 520 PPH
Note: Yields 155 KTAS at FL164 (5Km)
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Descent:
AVOID - shock cooling
Reduce MAP 0.1 Ata per minute MAX
RPM - RESTRAIN < 2250
MAX 310 KmIAS
OAT <= 5C CARB HEAT = HOT
Plan 400 PPH
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Approach Circuit and Landing:
Before Downwind leg
OAT <= 5C CARB HEAT = HOT
REDUCE < 200 KmIAS
FLAP = STAGE 1
Downwind
REDUCE < 175 KmIAS
FLAP = STAGE 2
LANDING LIGHTS - DEPLOY
Final
In time to achieve Vref
REDUCE < 150 KmIAS
FLAP = STAGE 3
CARB HEAT = COLD
Vref = Cross airfield boundary @ 110 KmIAS
THROTTLES = RETARD (IF REQUIRED)
(FLARE) ALWAYS LAND ON MAINWHEELS only
WHEN TAIL SETTLES - YOKE FULL AFT
FLAP = UP
BRAKES - as required
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