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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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