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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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