The de Havilland DH.112 Sea Venom is a British postwar carrier-capable jet aircraft developed from the de Havilland Venom. It served with the Royal Navy Fleet Air Arm and with the Royal Australian Navy. The French Navy operated the Aquilon, developed from the Sea Venom FAW.20, built under licence by SNCASE (Sud-Est).
Design and development
The Sea Venom was the navalised version of the Venom NF.2 two-seat night fighter, and was used as an all-weather interceptor by the Fleet Air Arm (FAA). The necessary modifications for use on the Royal Navy's aircraft carriers included folding wings, a tailhook (which retracted into a characteristic "lip" over the jetpipe) and strengthened, long-stroke undercarriage. The canopy was modified to allow ejection from underwater. The first prototype made its first flight in 1951, and began carrier trials that same year.



A further two prototypes were built. The first production Sea Venom took the designation FAW.20 (Fighter, All-Weather). It was powered by a single de Havilland Ghost 103 turbojet engine and its armament was the same as the RAF version. The next variant was the FAW.21, which included the modifications introduced in the Venom NF.2A and NF.3. Some of these modifications included the Ghost 104 engine, a clear-view canopy and American radar. The final Royal Navy variant was the FAW.22 powered by the Ghost 105 engine. A total of 39 of this type were built in 1957–58. Some were later fitted out with the de Havilland Firestreak air-to-air missile.

Seven FAW.21s were modified in 1958 for Electronic countermeasures (ECM) purposes, with the cannon replaced by the ECM equipment. These became the ECM.21. 831 Naval Air Squadron, the sole squadron to be equipped with it, was shore-based at RAF Watton from 1963 and disbanded in 1966. Converted FAW.22s were similarly known as the ECM.22.

A modernised Sea Venom project, the DH.116 with swept wings and upgraded radar was considered, but cancelled as the Royal Navy believed that any replacement needed two engines. The de Havilland Sea Vixen ultimately replaced the Sea Venom.
Operational history
Royal Navy service

In 1956 Sea Venoms, alongside RAF Venoms, took part in the Suez War. They were from Nos. 809, 891, 892, 893, 894, 895[2] Naval Air Squadrons based on the light fleet carrier HMS Albion and fleet carrier HMS Eagle. The Anglo-French invasion, codenamed Operation Musketeer, began on 31 October 1956 signalling the beginning of the Suez War. The Sea Venoms launched many sorties, bombing a variety of targets in Egypt in the process.

Sea Venoms also saw service during conflicts in the Middle East.

By 1959, the Sea Venom began to be replaced in Royal Navy service by the de Havilland Sea Vixen, an aircraft that also had the distinctive twin-boom tail. The Sea Venom would be withdrawn from frontline service soon afterwards. The type continued to fly with second line FAA units until the last were withdrawn in 1970.
Service with other nations
Thirty-nine Sea Venom FAW.53s saw service with the Royal Australian Navy (RAN), replacing the Hawker Sea Fury. The Sea Venom entered service in 1956 and, during its service with the RAN, operated off the aircraft carrier HMAS Melbourne. It was taken out of first-line service in 1967, replaced by the American McDonnell Douglas A-4G Skyhawk.

From 1957 to 1961, French Navy Aquilons took part in counter-insurgency operations in Algeria. They were withdrawn from service in 1965.
Variants
DH.112 Sea Venom NF.20
Prototype Sea Venom, based on Venom NF.2., three-built.
FAW.20
Initial production aircraft, based on Venom NF.2A. 4,850 lbf (21.6 kN) Ghost 103 turbojet engine, AI Mk 10 (US SCR 720) radar. 50 built.
FAW.21
Improved version, equivalent to Venom NF.3. 4,950 lbf (22.1 kN) Ghost 104 engine, AI Mk 21 (US APS-57) radar, strengthened long-stroke undercarriage. 167 built.
ECM.21
Six FAW.21s modified from 1957 for ECM purposes. No armament.
FAW.22
More powerful (5,300 lbf (23.6 kN)) Ghost 105 engine, giving improved high-altitude performance.39 new built.
ECM.22
Equivalent of ECM.21, based on FAW.22
FAW.53
Australian designation for the Sea Venom FAW.21. 39 built.

SNCASE Aquilon
French-built Aquilon 203 displayed at Lorient South Brittany Airport in 1973

SNCASE (Sud-Est) license-built 101 Sea Venom FAW.20 as the Aquilon for the French Navy.

Aquilon 20 – 4 examples assembled from the parts provided by de Havilland plus 25 locally built.
Aquilon 201 – Three prototypes built in France.
Aquilon 202 – Two-seat version with ejection seats, an American AN/APQ-65 radar and air-conditioning. 25 built.
Aquilon 203 – Single-seat version with an American AN/APQ-94 radar and equipped with racks for air-to-air missiles. Prototype converted from Aquilon 202 plus 40 built.
Aquilon 204 – Two-seat training version without guns. 6 Converted from Aquilon 20.
Below RN


















Below Aéronavale




Below RAN

Specifications (Sea Venom FAW.22)
General characteristics
Crew: 2
Length: 36 ft 7 in (11.15 m)
Wingspan: 42 ft 11 in (13.08 m)
Height: 8 ft 6.25 in (2.5972 m)
Gross weight: 15,400 lb (6,985 kg)
Max takeoff weight: 15,800 lb (7,167 kg)
Powerplant: 1 × de Havilland Ghost 105 centrifugal-flow turbojet engine, 5,300 lbf (24 kN) thrust
Performance
Maximum speed: 576 mph (927 km/h, 501 kn) at sea level

555 mph (482 kn; 893 km/h) at 30,000 ft (9,100 m)

Range: 705 mi (1,135 km, 613 nmi)
Service ceiling: 39,500 ft (12,000 m)
Rate of climb: 5,750 ft/min (29 m/s)
Armament
Guns: 4 × 20 mm (0.787 in) Hispano Mk.V cannon, 150 rpg
Rockets: 8 × "60lb" RP-3 unguided rockets
Bombs: 2 × 1,000 lb (454 kg) bombs
(Text from Wikki)