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Pilot's Handling Notes for a Savoia Marchetti S.M.81 with Piaggio X/RC15 engines
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The three 700hp Piaggio P.X/RC15 engines have automated mixture controls, and manually applied carb heat controls. Superchargers deliver rated power up to 1500 metres. This engine and airscrew combination require a rated rpm technique. 

LEVEL or DIVING WAR EMERGENCY ONLY = MAX 2475 RPM

LEVEL or DIVING COMBAT RATING = MAX 2350 RPM

CLIMBING and MAX for TRANSPORT, FERRY and TRAINING FLIGHTS = 2100 RPM

AUTOMIXTURE - This engine has Automixture in real life. Turn automixture ON in the FS9 realism screen before flight.

Design cruise altitude is 4000 metres.

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Take Off: 

AUTOMIXTURE = ON (in FS9 realism options)

FLAP = STAGE 1

CARB HEAT = COLD

TRIM = SLIGHT POSITIVE

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 Climb power

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Climb power:

Plan 750 PPH

C2 = max 0.95

RPM = max 2100

200 KmIAS

On reaching 4000 metres

Call for design cruise power

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Design and Econ Cruise: 

RPM = 2100

Plan 570 PPH

Note: Yields 146 KTAS at FL131 (4Km)

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Patrol: 

RPM = 1900

Plan 540 PPH

Note: Yields 133 KTAS at FL49 (1.5Km)

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Descent:

RPM - RESTRAIN < 2350

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


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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