Showing posts with label FMA IA-58 Pucará. Show all posts
Showing posts with label FMA IA-58 Pucará. Show all posts

Sunday, May 17, 2026

Malvinas: On How the AAF Operated the Pucará

 

This is how we had to operate with the Pucará

Account taken from the book “With God in the Soul and a Falcon in the Heart”
Narrated by: Captain Grunert — Pucará pilot
Date: 1 May 1982
Place: Darwin
Flight: Captain Grunert, No. 1; Lieutenant Calderón, No. 2; Lieutenant Russo, No. 3; and Lieutenant Cimbaro, No. 4
Weather: calm wind, 3/8 Ac. As. — altocumulus and altostratus. Almost half the sky covered.

Take-off: night-time.

At approximately 05:00 hours we were woken by the Squadron Commander, Major “Toto” Navarro, who informed us that Puerto Argentino had been attacked at 04:40 hours and that we should prepare to take off at first light.

After the pre-flight briefing, we went to a small hut beside the runway to wait while the runway markers were put in place: two at the threshold, one on top of a half 200-litre drum, and another at the opposite threshold.

The flight that was to take off was designated, but since No. 1 and No. 2 were not ready, No. 3 and No. 4 were ordered to take off, in that order.

At the threshold we placed the two aircraft parallel to one another, in order to make use of as much ground as possible, since the field was very short and take-off was not safe. It was a semi-prepared strip laid out on a paddock, very soft and uneven.

While we were at the threshold, No. 1 and No. 2 were taxiing towards it.

During the take-off run, No. 3 put one of its undercarriage wheels into a hole, causing the pilot to lose control of the aircraft. It became completely airborne for approximately 15 seconds and then came down again on three points. By the time it reached the end of the runway, the aircraft was still 5 kilometres per hour below the speed needed for take-off. The departure was extremely rough, with the aircraft buffeting and its wheel striking the marker at the end of the strip.

At the end of the threshold, about 30 metres away, there was a wire fence covered with a kind of creeper roughly 1.5 metres high, which made the take-off even more critical.

Once airborne, No. 4 set course to the south, where we were to remain awaiting orders, while No. 1 and No. 2 were to carry out an offensive reconnaissance before rejoining in the southern sector of Cóndor Base, at Darwin.

No. 1 and No. 2 were unable to take off because No. 1 had an accident at the runway threshold. As a result, the only element available to carry out the mission was the section made up of No. 3 and No. 4.

After five minutes of waiting, the section headed towards the target: a British helicopter-borne landing — an attack with men transported by helicopters — near Puerto Argentino. The radar later informed us that the helicopters had disappeared. For that reason, and after overflying the area, we returned to our base of origin.

With fuel already down to the minimum, I contacted the tower and requested permission to enter the circuit. Permission was denied, and I was ordered to proceed to the alternative airfield, Calderón Naval Air Base, located on Isla Borbón.

Since my fuel gauge was almost at zero, I informed the tower and requested authorisation to land, but they repeated the previous instructions. On my third communication, I was ordered to reach the alternative by any means necessary, because Darwin had been under attack by enemy aircraft for the previous two hours.

The section reached Calderón with practically no fuel left, and No. 3 had to land with the nose wheel unlocked, since it had been twisted during take-off when it hit the hole. To make matters worse, this runway was even worse than the one at Cóndor Base: its surface was very soft and prone to flooding, something that would cause us serious problems in the future.

We were all eager to refuel and rearm, because the escape of our prey had left us full of frustration and with a strong desire to make them pay for the surprise attack of that early morning. But the days to come would more than give us the chance for a revenge we would never forget.

Sunday, February 4, 2024

Malvinas: The Torpedo-bomber Variant of the IA-58 Pucará

The "Torpedo-bomber" IA-58 Pucará




In mid-May 1982, during the South Atlantic Conflict, the Strategic Air Command decided to carry out a series of test flights aimed at operationalizing the IA-58 Pucará system with the North American Mk 13 torpedo, practically deprogrammed by the Argentine Navy.

This torpedo, which had been produced between 1943 and 1945, was of a rather robust design and was designed for use from boats and airplanes. The Argentine Navy used it for several years, launching it at a speed of 165 km/h from Consolidated PBY-5A Catalina aircraft.

The person responsible for this project began at the Puerto Belgrano Naval Base. The Navy provided a sufficient number of torpedoes to which fastening elements were placed and the torpedo's own systems and mechanisms were put into service again, after a long time.

On May 21, 1982, the IA-58 Pucará AX-04 landed at the Comandante Espora Aeronaval Base, equipped with a video camera to record the moment the torpedo was launched, which would be placed in the central station of the plane.




The AX-04 Waiting for inspections before its flight with the torpedo already attached

On May 22, the first launch of the Mk 13 torpedo with an exercise head was carried out. The launch area selected by the Navy was located 65 kilometers from Puerto Belgrano. On the same day, a second launch was carried out. In its final run, the plane adopted a dive angle of 20º, a speed of 555 km/h and at an altitude of 100 meters it released the torpedo, which was destroyed on impact. The same thing happened the next day, although the launch was carried out with a dive angle of 45 degrees, 465 km/h and at a height of approximately 200 meters.




Photo taken by the central camera of Pucará AX-04

Tests showed that something was wrong with the torpedo after it was launched from an airplane. The Navy did not have operations manuals available for its aerial use, there was only information that the torpedo had to enter the water at an approximate angle of 20 degrees. If this angle was less, it would rebound, damaging the control and propulsion mechanisms, and if the angle was greater, there was a risk that the torpedo would become "stuck" to the bottom.

After making countless consultations with personnel who had been assigned to the torpedo workshop, the Mk 13 was fitted with an aerodynamic brake in the nose and a biplane horizontal stabilizer in the tail, additions that would be destroyed when the torpedo entered the water.

With these additions, on May 24, the first successful launches were carried out in the San José Gulf, Trelew. They were carried out from straight and level flight and at a height of 15 meters, determining the desired speed at 360 km/h, since at higher speeds the torpedo would collide with the seabed.

Seven tests were carried out, and on June 10, a launch with an explosive head was carried out in an area of deeper waters with a cliffed coast, located north of Puerto Santa Cruz, although the depth was not sufficient for the 465 km/h used, now by the Pucará A-566, which replaced the AX-04 in this launch.







Moments when the torpedo reached the cliffs

It was decided to make a last attempt on June 14 in the vicinity of Pingüino Island, near Puerto Deseado, selected for maximum depth and steep component of the coast, setting the final speed at 360 km/h, but this operation was canceled. definitely, while preparations for the launch were being made.

It is noteworthy that simultaneously with this project, studies were also carried out to drop, from the Pucará plane, Mk 12 anti-ship mines, planned to mine the San Carlos Strait in the Malvinas Islands. However, the hitching tests on the plane were not passed.



Brief history of the aircraft involved in the Pucará torpedo project

IA-58 AX-04 
Ex A-509. 
Discharged from FMA on July 5, 1977.
Discharged from  CEV on September 19, 1977.

IA-58 A A-566 
Discharge from FMA on November 17, 1981.
Registration of CEV on May 7, 1982.
Assigned to Squadron 4 Attack as a single-seater.
Transferred to Group 3 Attack.


Technical characteristics of the Mk 13 torpedo

Range: 5000 meters
Speed: 55 km/h
Ready weight for launch: 970 kilograms
Explosive charge (trotyl): 272 kilograms
Length: 4.10 meters
Diameter: 0.57 meters
Gyroscopic directional control
Maximum depth regulation: 15 meters
Propulsion: 2 counter-rotating propellers driven by a turbine (103 hp).