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Pilot's Handling Notes for a Savoia Marchetti S.M.79bis with Alfa Romeo 128/RC18 engines

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The SM79bis torpedo bomber made its debut in 1944. The three 860hp Alfa Romeo 128/RC18 (Bristol Pegasus) engines have automated mixture controls, and manually applied carb heat controls. Superchargers give rated power up to 1800 metres. Each engine can briefly deliver 930hp for take off or war emergency below 1800 metres. This engine has constant speed airscrews which can be feathered.

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 5,448lbs of AVGAS. The spoiler key must be used to load and then drop the torpedo and its associated drag. The weight of the torpedo is present by default. Cruise yields below are with/without external torpedo. When torpedo is released weight must be removed manually from FS9 payload menu. For post war passenger/cargo operations retain payload and do not display torpedo. Cruise yield will be intermediate.

Design cruise altitude is 4000 metres, but more economical cruising is availabe at 5000 metres whan no passengers are aboard.

CAUTION - Very weak brakes. Landing roll 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 1300 PPH

C2 = 1.26

RPM = 2300

230 KmIAS

ABOVE all obstacles

Call for Climb power

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Climb power:

Plan 1100 PPH

RPM = 2200

C2 = 1.09

240 KmIAS

On reaching 4000 metres

Call for flight plan cruise power

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Design Cruise:

C2 = 0.92

RPM = 1950

Plan 800 PPH

Note: Yields 210/225 KTAS at FL131 (4Km)

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Econ Cruise:

C2 = 0.82

RPM = 1900

Plan 700 PPH

Note: Yields 203/216 KTAS at FL164 (5Km)

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Descent:

RPM = as cruise

MAX 500 KmIAS

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

Plan 600 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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