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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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