Daesŭngri DS-5

Daesŭngri DS-5
Role	Fighter aircraft (G var.) Attack aircraft (N var.) Multirole aircraft (D var.)
National origin	DPRM
Manufacturer	Daesŭngri Aircraft Design Bureau
First flight	1974
Introduction	1977
Primary user	Menghean Army
Produced	1977-1999
Number built	865

The Daesŭngri DS-5 (Formal designation: 대승리 5호 전투기 / 大勝利五號戰鬪機, Daesŭngri O-ho Jŏntugi, "Daesŭngri No.5 Fighter;" Short designation 대승-5 Daesŭng-o "Daesŭng-5") is a single-seat, third-generation jet fighter developed in the Democratic People's Republic of Menghe by the Daesŭngri Aircraft Design Bureau. It was the first Menghean jet aircraft of entirely domestic design. Key features included variable-sweep wings and a radar capable of guiding radar-guided air-to-air missiles.

Over the course of its 22-year production span, the DS-5 was built in twelve major variants, including an air superiority fighter (DS-5G), a dedicated ground-attack aircraft (DS-5N), a reconnaissance platform (DS-5JCh), a carrier-based fighter (DS-5HM), two multiroles (DS-5D and DS-5R), and twin-seat trainer variants for most of these. Nearly 1,700 were produced in total between 1977 and 1999. The DS-5R remains in active service with several mid-readiness squadrons in the Menghean Army.

Development

Origins

The DPRM's first two jet fighters, the DS-1 and DS-2, were highly agile and easy to produce, but suffered from a number of shortcomings related to the age of their designs. Both lacked the ability to use radar-guided AAMs, and while the DS-2N did incorporate a ranging radar in the nose, this was only good out to 12 kilometers and could not distinguish between aerial targets and ground clutter. Later DS-2 variants could carry heat-seeking AAMs like the YGG-1 and YGG-2, but their lack of long-range missiles severely limited their usefulness against rival Dayashinese and Tyrannian aircraft, especially in BVR engagements.

At the end of the 1960s, the Menghean Ministry of Defense reached out to Letnia to inquire about a production license for the MiG-23, which was just beginning to enter service. Letnian representatives initially considered the state-of-the-art MiG-23 too advanced to license freely, but made the counter-offer to export knocked-down MiG-23 assembly kits starting in 1974. The MPA considered this deadline far too distant, and also worried that shipment by sea would leave the planes vulnerable to interception by foreign naval powers, who controlled the key straits and coastlines between Menghe and Letnia.

As negotiations remained at an impasse, some officials in the Menghean People's Communist Party proposed that the DPRM's aircraft industry was sufficiently advanced to attempt a fully domestic design project, adapted to suit the Army's own needs and requirements. This view found support among the Party's "Productionist" faction, led by Sim Jin-hwan, who was officially sworn in as General-Secretary in January 1971. The development and production contract was handed to the Daesŭngri design bureau, which had experience producing the DS-1 and DS-2 lightweight fighters and at the time had the largest accumulation of design expertise; Songrim's SR-3G was a direct copy of the Letnian Or-7, and Yŏng'an only had experience producing heavy bombers.

Design and testing

Faced with their new state requirement, the Daesŭngri design team began work on a new fighter aircraft in late 1971. Early on, the designers opted for a variable-sweep wing, much like the Letnian MiG-23 and Sieuxerrian Menace-C. In return for its added complexity, a swing-wing design would allow the new fighter to reach high speeds at altitude while also meeting the short takeoff and landing distance requirements imposed by the DPRM's sparse airfields. A large conical nose with side intakes was also chosen in place of earlier central nose intakes, in order to leave more space for an air-search radar.

Some initial debate existed over whether to use a twin-engine or single-engine configuration. Han Do-hun, the chief designer at Daesŭngri, initially favored a single-engine layout out of the belief that it would minimize weight and thus improve maneuverability. But past experience with the single-engine DS-1, DS-2, and SR-3 had revealed relatively frequent problems with burnouts and other failures, even on regular training flights, due to the inconsistent quality of Menghean engine production. A twin-engine design offered the advantage of letting the new jet return to base under half power if one engine failed, avoiding the total loss of an expensive plane. The DPRM also lacked a single engine with the required thrust, and many designers were skeptical that an entirely new engine could be developed in the available time, given the DPRM's lack of new engine design experience. Supporters of the single-engine layout eventually relented, and the twin-engine proposal went forward. As a further move to improve reliability, the designers chose the Gokchŏn Gi-12 turbojet, itself a development of the Gi-7 (licensed Tumansky R-11 produced in the thousands for the Daesŭngri DS-2.

Work on the radar incurred more serious delays. The Ministry of Defense initially insisted that the development of the radar should be entirely domestic, with no foreign parts, a requirement that proved difficult to meet given the immaturity of Menghe's domestic electronics sector. Prototype JG-01, which flew on July 12th, 1974, had a concrete weight in the radome to maintain balance. Under pressure to push the plane into service, Daesŭngri secretly obtained an RP-22SMA radar from a Polvokian MiG-21MF and reverse-engineered it to produce the JT-77 Bŏngae ("Lightning") radar. Official announcements claimed that the radar was fully indigenous, but its physical appearance and actual origin were kept a closely guarded secret until the 1990s.

Test flights took place from 1974 through 1977, before the new radar had even been installed. The second prototype, JG-02, crashed due to pilot-induced oscillation, resulting in the death of the pilot; another suffered damage on a high-speed dive, forcing the test pilot to eject. Investigation revealed problems with the airspeed indicator dial and other instruments, particularly a low response rate. Despite claims that these were fixed, periodic instrument problems persisted into the first few batches of aircraft.

Production

In spite of lingering concerns over instrument response and the very recent integration of the JT-77 radar, Daesŭngri's prototype was ordered into production in 1977 as the DS-5G fighter. To speed up production, the DS-2 assembly line was shut down in 1979 and refurbished to support manufacture of the DS-5. Production records state that 129 airframes were produced in 1980 alone, and average annual production had risen to about 150 airframes by 1985, spread across all variants.

Design

Armament

The DS-5G was produced with five external hardpoints for ordnance: one under the fixed section of each wing, one on each corner of the lower fuselage, and one along the centerline. Swiveling hardpoints under the swinging wings were considered during development, but the design team chose to omit them in order to save weight, reduce complexity, and avoid damage from hardpoints becoming stuck at a given angle. The centerline hardpoint could only be used to carry an external fuel tank, and the under-wing hardpoints were also adaptable for this purpose, though as this configuration halved the number of air-to-air missiles, it was only used in long-distance ferry flights.

Ironically, even though beyond-visual-range combat had been a major selling point of the project, the JT-77 radar used on early-production DS-5Gs lacked the ability to support radar-guided missiles. It also struggled to distinguish aerial targets from ground clutter, and thus lacked look-down/shoot-down capability. To deceive foreign intelligence agencies, the DPRM obtained a license to produce the R-23 missile as the YGG-3, and even mounted this weapon on DS-5s during parade flights. In actual service, however, the DS-5G was entirely limited to the heat-seeking YGG-2, the same missile used by late-production DS-2 variants.

Gun armament consisted of two NR-23 autocannons, one in each bottom corner of the nose. Each carried 120 rounds of ammunition. This was the same gun armament used on the DS-2, and it reflected both the Menghean People's Army Air Force's doctrine of pursuing close-range dogfights, and an effort to balance the failure of the JT-77 radar.

Powerplant

The first four prototypes of the DS-5 had variable-angle splitter plates to control airflow to the engines at different speeds and altitudes.

All DS-5 variants are driven by two DFS-5K90 turbojets in a conventional side-by-side layout. Though less powerful than the single engine trialed on the DS-4, this theoretically ensures that if a single engine is lost the aircraft can still limp back to a friendly airstrip. Because the engines are directly adjacent, however, any hit that knocks out one is likely to damage the other, and any widespread flame can easily spread.

The outer wing sections of the DS-5 can adjust to pre-set angles for a leading-edge sweep of 21, 45, or 79 degrees. Even at maximum sweep, its agility is limited by the high wing loading typical of non-delta designs. The type’s light overall weight helps compensate for this, but comes at the cost of a less sturdy structure; in combat, the DS-5 has proven relatively fragile, seldom able to return to base after sustaining damage.

Armament

File:Feidou FD-5E ordnance guides.png

Diagram showing possible armament options for the DS-5E, matched with the hardpoints that can support them.

The DS-5A has a total of five external hardpoints: two under each wing, and one centered beneath the fuselage. Of the wing hardpoints, the outer two are mounted on the variable-geometry sections of the wing, and automatically rotate to face forward at different wing angles. In early service, a typical air-to-air loadout consisted of two YGG-3 radar-guided missiles on the inner wing hardpoints and two ShK-1K heat-seeking missiles on the outer ones. The centerline hardpoint was not wired to carry missiles, and was usually hooked up to a drop tank to extend the fighter’s limited operational range. Later variants (see side image and text below) added compatibility with more advanced air-to-air missiles, and with a variety of ground-attack munitions.

Gun armament remained an important part of the design process, as the Daesŭngri design bureau and the Menghe People’s Air Force still believed that missiles were not sufficiently reliable and needed a fighter that could continue close-range or low-level engagements after its air-to-air missiles were exhausted. As such, the DS-5A was given two 30mm autocannons, one on either side of the nose just beneath the pilot’s seat.

Variants

DS-5B

In 1976, two years before the DS-5A entered service, the Menghe People’s Air Force expressed interest in developing a “fighter-bomber” version for the ground-attack role. Prior to then, the DS-2B fulfilled this mission, but it was ill-protected and armed only with unguided rockets. At this time, the Sunglin design bureau was nearing completion of its SL-6 tactical bomber, but the Daesŭngri design bureau attempted to pre-empt them by expanding the DS-5 project to include a “fighter-bomber” for the ground attack role.

The resulting DS-5B was externally similar, but its hardpoints were rewired to accept air-to-ground munitions like the PD-41 and PD-42 anti-tank missiles and the PD-43 anti-radiation missile. They were also reinforced to allow the use of heavier munitions, especially with the redesign of the centerline hardpoint to carry bombs, though maximum payload remained relatively light at 3,000 kilograms. The DS-5B retained the MBR-200 radar, mainly to cue targets for the anti-radiation missiles and alert the pilot to enemy aircraft, but due to the hardpoint redesign it was only able to fire heat-seeking missiles.

DS-5Ch

An indirect outgrowth of the DS-5B program, the DS-5Ch is a dedicated “tactical reconnaissance” variant which is used to survey the distribution of enemy forces and assess the damage from artillery and airstrikes. Unlike all other non-trainer aircraft in the DS-5 family, it is a two-seater, with a heavily modified cockpit area in which the rear crew member mans the camera and other reconnaissance equipment. The nose section is also extended, allowing the installation of supporting equipment for an integral forward-facing camera, though to increase space and reduce weight this required the deletion of both 30mm autocannons. which first entered service in 1982. It typically mounts a camera system or SIGINT pod on the center hardpoint.

To compensate for the DS-5’s poor operational range, the inner-wing hardpoints are nearly always fitted with drop tanks, though aircraft have also been spotted with anti-radiation missiles and jamming equipment. The outermost hardpoints, where they are used, are usually fitted with heat-seeking air-to-air missiles for self-defense.

DS-5HM

While the DS-5 project was still underway, Menghe was also working on its first aircraft carrier, the IMS Shinbeigang. This led to the diversion of resources to a new variant which could serve as Menghe’s new shipborne jet fighter. The resulting DS-5HM (항공모함, hanggongmuham, "aircraft carrier") resembled the DS-5A, but was treated with corrosion-resistant materials and had a tail hook for barrier-arrested recovery. It did not have upward-folding wings, instead placing the wings in their swept position to reduce its deck footprint.

In the mid-1980s, work was underway on a new carrier variant which applied the same changes as the DS-5D (see below), but testing stopped in 1987 due to the disturbance of the Decembrist Revolution. Testing was resumed in early 1989, with the resulting DS-5HMD entering service in 1992. Seven years later in 1999, a series of upgrades from the DS-5E project were applied to these aircraft, producing the DS-5HME.

DS-5D

The DS-5D arose as a response to concerns that the DS-5A was becoming outdated in the air-to-air role. It incorporated the more powerful MBR-400 radar set, which extended the effective detection range and allowed more targets to be tracked at once. This made DS-5D the first variant to have true look-down, shoot-down capability, and the first capable of beyond-visual-range engagements, albeit at the lower bound of the definition. It was also rewired for compatibility with more recent air-to-air missiles, and given a somewhat more effective electronic warfare suite. To make room for the larger radome, and to remove redundant weight, it eliminated the right-side 30mm autocannon, leaving only the one on the left.

Due to the extensiveness of the changes, the -D upgrade could not be retrofitted onto existing aircraft, and was instead filled through new production. The first deliveries of DS-5Ds began in 1985, and production continued into the 1990s.

DS-5E

A further upgrade commissioned by the Menghean government, the DS-5E first entered service in 1997. It originated as an interim project to fill the Menghean People's Air Force’s air superiority role until more advanced aircraft like the DS-12 and SL-8 could enter service in sufficient numbers. It was also designed to maximize the modularity of changes, allowing the upgrade to be applied to the existing DS-5D fleet.

As such, most of the changes concerned minor improvements to electronics and instruments, including compatibility with new air-to-air missiles and a slightly more sophisticated electronic warfare suite. The design team also added integration with a wider variety of air-to-ground munitions, forming the first DS-5 with true multirole capability. Many of these require the DZM-900 electro-optical support pod and DZM-800 laser designator, which are carried on new hardpoints underneath the intakes. Nevertheless, the plane’s short range and poor payload limited its usefulness.

Other Variants

• DS-5HR: (훈련기, Hunryŏngi, "trainer aircraft") trainer with a lengthened cockpit differing from the one on the DS-5Ch, introduced alongside the original DS-5A. It uses a smaller radar set to allow room for a larger downward-sloping canopy, and has a shorter range. It is not considered usable in combat.

Service

Menghe

Between the late 1970s and the early 2000s, the DS-5 in its various forms was the main combat aircraft of the Menghean People’s Air Force. Over 2,500 were produced in all, about half of them in the D and E variants. During the 1990s and early 2000s, the Menghean People's Air Force began replacing some DS-5s with the more advanced DS-12, but this proceeded at a relatively slow pace.

Since the 2005 military reforms, which merged the Menghean People's Air Force into Menghean Army Aviation, new production of DS-5s stopped and a serious effort was made to replace the fleet. As of 2014, only a few active units still operate the DS-5, most notably the 6th Frontal Army Aviation Corps (which replaced these with DS-12s in 2016). Some 1,200 DS-5s remain in service with reservist units, most of them in the D and E variants.

The DS-5HM was the standard carrier aircraft of the Menghe People’s Navy, and the Sinbukgang-class aircraft carriers were designed with the type in mind. After the ISS Chikai was decommissioned in 2015, the last DS-5HHEs were withdrawn from service, though some are still on display at the Haeju National Naval Museum where the Chikai now resides.

The last DS-5Ch was retired from active service in 2012; the “tactical reconnaissance” role has largely been taken up by unmanned platforms instead, although the reconnaissance variant of the Daesŭngri DS-8 still remains in use for certain reconnaissance roles.

Other Users

• Dzhungestan: 60 DS-5As purchased in 1981. In the 1990s, the government purchased an additional 60 DS-5Bs and 60 DS-5Ds.
• Qusayn: 70 DS-5As and 40 FD-5Bs purchased in 1983; as of 2014, they are still in active service.
• Template:Country data Ummayah: About 200 DS-5s in service prior to the Ummayan Civil War, split roughly evenly between DS-5As and DS-5Bs.

Specifications (DS-5E)

General Characteristics

File:Feidou FD-5.png

Three-view diagram of the DS-5D.

• Crew: 1
• Length: 16.32 meters overall
• Wingspan, extended: 13.33 meters
• Wingspan, swept: 7.14 meters
• Height: 4.36 meters (on the ground, gear out)
• Wing Area: 29.46 square meters spread
• Empty Weight: 9,220 kg (20,330 lbs)
• Loaded Weight: 13,800 kg (29,760 lbs)
• Maximum Takeoff Weight: 16,950 kg (37,370 lbs)
• Powerplant: 2x DFS-5K90 turbojet
• Dry Thrust: 36 kN (8090 lbs-force) each
• Thrust with Afterburner: 57 kN (12810 lbs-force) each
• Fuel Capacity: 3,860 kg (8,578 lbs)

Performance

• Maximum Speed at Sea Level: Mach 1.10 (1348 km/h)
• Maximum Speed at High Altitude: Mach 2.23 (2812 km/h)
• Combat Radius: 780 km with 4 AAMs and no external tanks
• Service Ceiling: 16,500 meters
• Rate of Climb: 220 meters per second
• Wing Loading: 468 kg/m2
• Thrust-to-Weight Ratio: 0.82 (afterburner at loaded weight)

Armament

• Guns: 1x BGP-30-1 autocannon (2x BGP-30-1 on -A and -B)
• Payload: 3,500 kg on 5 external hardpoints
  

- 1x 1,000-kg hardpoint (fuselage centerline)
- 2x 1,000-kg hardpoint (fixed wing inner section)
- 2x 250-kg hardpoint (variable wing outer hardpoint)