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Pilot's Handling Notes for a Savoia Marchetti S.M.79M with Alfa Romeo 126/RC34 engines

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The three 750hp Alfa Romeo 126/RC34 (Bristol Pegasus) engines have automated mixture controls, and manually applied carb heat controls. Superchargers give rated power up to 3400 metres. Each engine can briefly deliver 780hp for take off, go around or war emergency below 3500 metres. This engine has constant speed airscrews.

 

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

 

This medium bomber is loaded by default with 4,633lbs of AVGAS and 2,200lbs of bombs (1000Kg = design bombload). The torpedo weighed only 930Kg, but allowing for the weight of the torpedo crutch payload hardly differed for a torpedo bombing mission. CAUTION - When carrying an external torpedo drag is significantly higher.

 

Design cruise altitude is 6000 metres for any mission.

 

CAUTION - Very weak brakes. Landing roll much longer than take off roll.

 

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Take Off:

 

AUTOMIXTURE = ON (in FS9 realism options)

 

FLAP = STAGE 1

 

CARB HEAT = COLD

 

TRIM = 1 CABRATA

 

SCREWS = FULL FINE

 

LINE UP

 

BRAKES = ON

 

THROTTLES = FULL

 

BRAKES = OFF

 

YOKE = FULL FORWARD to raise tail

 

TAIL UP - ROTATE FIRMLY

 

POSITIVE RATE OF CLIMB

 

GEAR UP

 

RESTRICT CLIMB <= 3 m/s VSI

 

ACCELERATE = 175 KmIAS

 

FLAP = UP

 

ACCELERATE = 230 KmIAS

 

WAIT FOR > 3 m/s VSI

 

Call for Rated power

 

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Rated power:

 

Plan 1130 PPH

 

C2 = 1.3

 

RPM = 2300

 

230 KmIAS

 

ABOVE all obstacles

 

Call for Climb power

 

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Climb power:

 

Plan 850 PPH

 

RPM = 2200

 

C2 = 1.2

 

240 KmIAS

 

On reaching 6000 metres

 

Call for flight plan cruise power

 

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Design Cruise:

 

C2 = 1.0

 

RPM = 2070

 

Plan 660 PPH

 

Note: Yields 200 KTAS at FL197 (6Km)

 

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Econ Cruise:

 

C2 = 0.95

 

RPM = 1800

 

Plan 600 PPH

 

Note: Yields 185 KTAS at FL197 (6Km)

 

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Descent:

 

RPM = 1800

 

MAX 500 KmIAS

 

<0.7 C2 and OAT <5C CARB HEAT = HOT

 

Plan 500 PPH

 

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Approach Circuit and Landing:

 

 

Before Downwind leg

 

OAT <= 5C CARB HEAT = HOT

 

RPM = 2000

 

REDUCE < 220 KmIAS

 

FLAP = STAGE 1

 

 

Downwind

 

REDUCE < 200 KmIAS

 

FLAP = STAGE 2

 

 

In time to achieve Vref

 

GEAR = DOWN

 

REDUCE < 175 KmIAS

 

FLAP = STAGE 3

 

CARB HEAT = COLD

 

 

Cross airfield boundary @ 135 KmIAS (@ 20,000lbs)

 

ALWAYS LAND ON MAINWHEELS only

 

THROTTLES = CLOSED

 

WHEN TAIL SETTLES = YOKE FULL AFT

 

FLAP = UP

 

BRAKES = as required

 

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