High Speed Low Drag Bomb


The High Speed Low Drag (HSLD) bomb is a family of new generation short range air-dropped precision-guided munition that is currently being developed by India's Defence Research and Development Organisation (DRDO). This general-purpose bomb is made for the Indian Air Force (IAF) and can be used against the destruction of strategic high value enemy infrastructure from stand-off distances.[4][5] HSLD is comparable to Mark 80 series of bombs used by United States Air Force (USAF).

High Speed Low Drag Bomb
TypePrecision-guided general-purpose bomb
Place of originIndia
Service history
Used byIndian Air Force
Production history
DesignerArmament Research and Development Establishment (DRDO)
ManufacturerMunitions India Limited
No. built5000
Mass100 kg (220 lb)
250 kg (550 lb)
450 kg (990 lb)
500 kg (1,100 lb)
(additional RTU/BTU: ± 25 kg)[1][2]
Length1.90 m (74.80 in)[3]
Warhead weight110 kg ± 5 kg
170 kg ± 5 kg
Time fuze with electric/mechanical delay

30 km from 10 km altitude
21 km from 5 km altitude
13.5 km from 2 km altitude
Flight altitude10 km to 150 m
Mid-course: Fibre-optic gyro inertial navigation system with GPS/NavIC satellite guidance
Terminal: Semi-active laser homing
Accuracy3 m to 30 m CEP

Between May to June 2017, multiple test were conducted successfully for 450 kg and 500 kg class general purpose bomb (GPB) as well as of precision guided high speed low drag (PGHSLD) munition.[6][7]


The Armament Research and Development Establishment (ARDE),[8] Pune is the primary agency that started developing HSLD with the help from other DRDO laboratories to upgrade the conventional free fall unguided ordnance used by the Indian Air force (IAF) fighter pilots while Ordnance Factory Board (OFB) is the lead production agency. The development started with the aim to replace the older generation imported general purpose bombs that impose huge drag loss on fighter aircraft used by the IAF. The HSLD bomb is specially designed to productively use the higher speed of up to Mach 1.1 and wider flight envelope of newer generation NATO and Russian origin as well as Indian made aircraft. High Energy Materials Research Laboratory (HEMRL) developed the conventional type warhead that features blast, fragmentation and shaped charge for bunker buster role which uses Dentex as primary explosive for HSLD 450 and Torpex-4B mixed with RDX that act as explosive booster for HSLD 500.[9] By feeding the target coordinates, the warhead can be used to effectively destroy runway, railway track, bridge, industrial facility, dock and bunker while able to work in the absence of GNSS input due to satellite jamming.[10] The family of HSLD comes in two versions namely a general purpose bomb (GPB) and a precision guided high speed low drag (PGHSLD) unit under three different weight class category which features semi-active laser homing and anti-jamming satellite navigation antenna. HSLD is designed to carry a nose extension unit (NEU) with fixed canard for lift, stability and two different types of smart tail unit (STU) with individual independent fins controlled by a flight control unit (FCU) attached to a telemetry module to cover the whole spectrum of mission profile. The STU features a retarder tail unit (RTU) that is for low-level bombing missions while a ballistic tail unit (BTU) that can used for strategic high level bombing.[11][12][13][14]

HSLD can be launched from variety of aircraft that are under IAF inventory like Dassault Mirage 2000, Mikoyan MiG-29, SEPECAT Jaguar, Sukhoi Su-30MKI and HAL Tejas. IAF has already successfully tested PGHSLD 500 from Su-30MKI platform.[15]

Production facilityEdit

Ministry of Defence (MoD) gave green light to start mass production of 500 kg general purpose bomb by Munitions India Limited at Ordnance Factory Khamaria. On 17 January 2022 under the guidance of a team from HEMRL and ARDE, the first two bombs were carefully filled with primary and secondary warhead fillings. Each GPB carries 10,300 steel shells of 15 mm diameter. Each shell can target an area of upto 50 m from place of detonation.[16]


Two successful developmental trials were conducted in 2013 to prove the capability of the munition with all development related works to be completed by 2014.[17] From 22 May 2017, ARDE and IAF conducted a series of carriage as well as carriage release trials (CRT) for High Speed Low Drag 500 kg class unit, with both general purpose and precision guided variant at Pokhran range, Rajasthan. In initial carriage trial, the bomb carried sensors, telemetry and data logger while during the separate CRT session, satellite guidance units were added which flew on Su-30MKI from Jodhpur Air force Station. The bomb touched the carriage limit of 1041 km/h (0.85 mach) at 150 metre altitude on Su-30MKI that performed a 6.5 g full roll manoeuvre during the first GPB 500 trial while the PGHSLD 500 separation was carried out from an altitude of 5 km at a speed of 900 km/h (0.73 mach). Both bombs cleared the flight envelope and completed all the required parameters without any form of mechanical damage during the high speed release from the aircraft. The trials were conducted with the help of Hindustan Aeronautics Limited (HAL), Indian Air Force Test Pilot School and Centre for Military Airworthiness and Certification (CEMILAC).[18]


  • General Purpose Bomb – 100 kg, 250 kg, 450 kg and 500 kg
  • Precision Guided Bomb – 450 kg and 500 kg




  1. ^ "BOMB 250 KG HSLD (HE)". Directorate of Ordnance (Coordination and Services). Ministry of Defence, Government of India. Retrieved 18 January 2022.
  2. ^ "BOMB 450 KG HSLD HE". Directorate of Ordnance (Coordination and Services). Ministry of Defence, Government of India. Retrieved 18 January 2022.
  3. ^ "DNA Explainer: The bomb that can destroy any airport in Pakistan". DNA India. 11 January 2022. Retrieved 18 January 2022.{{cite web}}: CS1 maint: url-status (link)
  4. ^ Christopher, S (2017). DRDO Newsletter. Delhi: Defence Scientific Information and Documentation Centre. p. 5.
  5. ^ "'Glide bombs' the latest weapon in IAF's arsenal". Rediff. Retrieved 23 September 2020.
  6. ^ "2017: A year when India's Defence Research and Development Organisation, armed forces gained more strength". The New Indian Express. Retrieved 23 March 2020.
  7. ^ "The Indian Air Force in 2017 | ADU". www.aviation-defence-universe.com. Retrieved 23 March 2020.
  8. ^ "Glide Bomb SAAW: Guided weapon's success proof of DRDO prowess in developing indigenous capability". The Financial Express. 18 December 2017. Retrieved 22 September 2020.
  9. ^ Vadhe, P. P.; Pawar, R. B.; Sinha, R. K.; Asthana, S. N.; Subhananda Rao, A. (3 October 2007). "Cast aluminized explosives (Review)". Combustion, Explosion, and Shock Waves. 44 (July 2008): 461–477. doi:10.1007/s10573-008-0073-2. S2CID 97973762.
  10. ^ Dutta, Amrita Nayak (28 May 2019). "What is DRDO's inertial guided bomb and how it will boost India's defence capability". ThePrint. Retrieved 22 September 2020.
  11. ^ Thiagarajan, Sriram (9 October 2017). "New Generation ARDE Munitions Boost Indian Airforce Firepower". Delhi Defence Review. Retrieved 22 March 2020.
  12. ^ DRDO. "GPS / INS Guidance and Control Kit for 450 kg HSLD Bomb". Defence Research and Development Organisation. Retrieved 23 March 2020.
  13. ^ DRDO. "ARDE CARRIES OUT SUCCESSFUL FLIGHT TRIALS OF 500 KG GENERAL PURPOSE BOMB". DRDO Technology Development Fund. Retrieved 24 March 2020.
  15. ^ "DRDO Tests 500 Kg General Purpose Bomb From Su-30MKI Aircraft". www.defenseworld.net. Retrieved 23 March 2020.
  16. ^ "DNA Explainer: The bomb that can destroy any airport in Pakistan". DNA India. 11 January 2022. Retrieved 18 January 2022.{{cite web}}: CS1 maint: url-status (link)
  17. ^ "India developing guided bombs for fighters". The Economic Times. Retrieved 22 September 2020.
  18. ^ "India successfully tests 500 kg Indigenous HSLD Bomb". East Coast Daily English. 9 September 2017. Retrieved 23 March 2020.


  1. ^ DRDO tested ATGM NAG successfully. DRDO Newsletter. August 2017 Issue.

External linksEdit

  • "DRDO Newsletter" (PDF). Defence Scientific Information and Documentation Centre. August 2017.