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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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