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SAI-Ambrosini SS.4

Canard-Configured Pusher Fighter Aircraft Prototype

SAI-Ambrosini SS.4

Canard-Configured Pusher Fighter Aircraft Prototype

OVERVIEW
SPECIFICATIONS
ARMAMENT
VARIANTS
HISTORY
MEDIA
OVERVIEW



SAI-Ambrosini produced the short-lived SS.4 canard fighter - the sole example lost in a crash on its second flight and claiming its pilot in the process.
National Flag Graphic
ORIGIN: Kingdom of Italy
YEAR: 1939
MANUFACTURER(S): Societa Aeronautica Italiana Ing A Ambrosini (SAI-Ambrosini) - Italy
PRODUCTION: 1
OPERATORS: Kingdom of Italy
SPECIFICATIONS



Unless otherwise noted the presented statistics below pertain to the SAI-Ambrosini SS.4 model. Common measurements, and their respective conversions, are shown when possible.
CREW: 1
LENGTH: 22.15 feet (6.75 meters)
WIDTH: 40.42 feet (12.32 meters)
HEIGHT: 8.20 feet (2.5 meters)
WEIGHT (EMPTY): 3,968 pounds (1,800 kilograms)
WEIGHT (MTOW): 11,905 pounds (5,400 kilograms)
ENGINE: 1 x Isotta-Fraschini Asso XI R.C.40 V12 liquid-cooled inline piston engine developing 960 horsepower.
SPEED (MAX): 354 miles-per-hour (570 kilometers-per-hour; 308 knots)
CEILING: 16,404 feet (5,000 meters; 3.11 miles)




ARMAMENT



PROPOSED (never fitted)
1 x 30mm cannon in nose
2 x 30mm cannons in nose
VARIANTS



Series Model Variants
• SS.4 - Base Series Designation; sole prototype constructed.


HISTORY



Detailing the development and operational history of the SAI-Ambrosini SS.4 Canard-Configured Pusher Fighter Aircraft Prototype.  Entry last updated on 5/31/2017. Authored by Staff Writer. Content ©www.MilitaryFactory.com.
Even before the American Curtiss XP-55 "Ascender" and the Japanese Kyushu J7W "Shinden" came into being as "canard" configuration fighter proposals of World War 2 (1939-1945), it was the Italian firm of SAI-Ambrosini that was making headway with their SS.4 development of 1939. Indeed the type became credited as being the first such aircraft to sport the "tail-first" arrangement and even the first to feature a retractable nose-wheel undercarriage. Designed around the concept of a single-seat, single-engine fighter, the SS.4 came to nothing when the program's sole prototype was lost in a crash.

The aircraft was the brainchild of Sergio Stefanutti who championed the canard form in previous aircraft of his own design. The new aircraft featured its wing mainplanes set aft of midships which repositioned the tailplanes forward along the sides of the nose - hence the "tail-first" descriptor used. The cockpit was situated slightly ahead of midships. As no true tail unit was used, the vertical tail fins were placed at the midway span of each wing mainplane, reaching beyond the trailing edges. A wholly retractable, wheeled undercarriage was featured and all-metal construction was used throughout the build of the SS.4.




SAI-Ambrosini SS.4 (Cont'd)

Canard-Configured Pusher Fighter Aircraft Prototype

SAI-Ambrosini SS.4 (Cont'd)

Canard-Configured Pusher Fighter Aircraft Prototype



Propulsion came from an Isotta-Fraschini Asso XI R.C.40 series V12 liquid-cooled inline piston engine developing 960 horsepower. The unique arrangement of the aircraft included the engine being set in the rear of the fuselage, aft of the cockpit, and thus a "pusher" arrangement was used in which the engine "pushed" instead of "pulled" the aircraft through the sky. The powerplant was mated to a variable pitch, three-bladed propeller unit. One recorded performance specification for the aircraft was a maximum speed of 355 miles per hour (another source states 335 miles per hour).

As a fighter development, proposed armament was 1 x 30mm cannon and 2 x 20mm cannons - all mounted in the nose as a lack of a forward-mounted engine allowed for the gun collection to be concentrated forward of the cockpit (as in the American Lockheed P-38 "Lightning" fighter) - giving unobstructed views when facing a target (and this no synchronizing gear was needed to fire through a spinning propeller blade).

First flight of the finalized prototype was on March 7th, 1939 - months before World War 2 would officially overtake the shaky peace in Europe. The aircraft was constructed by the workers at SAI-Ambrosini ("Societa Aeronautica Italiana Ing A Ambrosini"). A second flight followed the very next day but it was during this time aloft that the prototype and its pilot were claimed in a crash. The starboard aileron detached from the aircraft which produced an uncontrollable oscillation of that wing mainplane and forced the aircraft into an irrecoverable dive, leading to the crash of the prototype and the loss of the pilot's life (Ambrogio Colombo being at the controls). The crash occurred near the city of Campagna with the cause blamed on poor craftsmanship.

After this, no other work was had on the SS.4 or any similar product by the company. Its short time in the air and its origins in prewar Italy undoubtedly have led to this aircraft being consistently overlooked in terms of canard fighter aircraft developments of the war.




MEDIA









Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

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Relative Maximum Speed Rating
Hi: 400mph
Lo: 200mph
    This entry's maximum listed speed (354mph).

    Graph average of 300 miles-per-hour.
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Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
1
1

  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.


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Supported Roles
A2A
Interception
UAV
Ground Attack
CAS
Training
ASW
Anti-Ship
AEW
MEDEVAC
EW
Maritime/Navy
SAR
Aerial Tanker
Utility/Transport
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Business
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A2A=Air-to-Air; UAV=Unmanned; CAS=Close Support; ASW=Anti-Submarine; AEW=Airborne Early Warning; MEDEVAC=Medical Evac; EW=Electronic Warfare; SAR=Search-Rescue
Supported Arsenal
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