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Italy's SIAI Marchetti S.M.84 bomber


The Savoia Marchetti S.M.84 was designed by Alesandro Marchetti to be a replacement for the S.M.79. The S.M.84 kept the wing design but improved the fuselage and added more powerful engines.

The S.M.84 had a wooden and steel tube frame with fabric, plywood, and aluminum making up the skin.

Landing Gear

The landing gear was retracted into the engine housing.


The bombs were carried in the fuselage and under the wings. Only 2,000 lbs of bombs could be carried internally. Two torpedoes could be carried externally.


The S.M.84 prototype first flew on June 5, 1940. While still ironing out the bugs, 246 were ordered.


  • Total: 309
  • Manufacturer: SIAI Marchetti


  • Savoia-Marchetti S.M.84:
  • Savoia-Marchetti S.M.84 bis: Cockpit and wings modified. The torpedo launching controls were updated. Engine ventilation was improved.


The S.M.84 proved to be less maneuverable and didn't succeed in replacing the S.M.79. Attempts were made to make it a torpedo plane but that failed.

First Use

In February 1941 the first bomber group received the S.M.84 for operations.

After the Surrender

Some S.M.84s were captured by the Germans but did few operations.

Ten S.M.84s were used by the Allies in a transportation group.

After World War II

Some S.M.84s were used as transports until 1948.


  SIAI Marchetti S.M.84
Type Bomber
Crew 5
Engine (Type) 3: Piaggio P.XI RC 40
Cylinders Radial 14
HP 1,000 each
Cooling Air
Propeller blades 3 metal variable pitch
Span 69' 4"
Length 58' 10"
Height 15' 1"
Wing area  
Loaded 29,330 lb
Maximum load  
Speed @ 15,000' 268 mph
Cruising speed  
Service ceiling 25,900'
Range 1,137 miles
Top turret 1: 12.7 mm MG
Sides 2: 12.7 mm MG
Underside 1: 12.7 mm MG
Bombs 4,400 lb
Torpedo 2


  1. World War II Airplanes Volume 1, Enzo Angelucci, Paolo Matricardi, 1976
20th Century American Military History Crucial Site