Indian Indigenous Aero Engine Developments

Most of the facilities built with OEM involvement are usually reserved for OEm orders only, ie only Safran orders would be catered via that line. I wonder if this is true for the new facility we see here too or not.
 
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Detailed Info on DRDO VRDE Indigenous DIESEL ENGINE for MALE UAV



DIESEL ENGINE FOR RUSTOM-II UAV (Image DEFENCE EXPO 2020)
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DIESEL ENGINE FOR RUSTOM-II UAV (Brochure DEFENCE EXPO 2020)
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MAJOR SPECIFICATIONS :
Config. : 4-Stroke 4-Cylinder Inline, Turbocharged, Common Rail Direct Injection Engine
Max. Power : Min. 180 hp available upto 11,000 ft
Max. operating altitude : 32,000 ft
Best Economy SFC : < 210 g/kWh @ Sea Level
Type of Fuel : ATF K-50 and Diesel
Dry Weight : < 195 kg
Installed Weight : < 270 kg

DIESEL ENGINE FOR RUSTOM-II UAV (Brochure DEFENCE EXPO 2020)
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Diesel engine is developed by VRDE for RUSTOM-II UAV. Indigenously developed airworthy High power engine is producing take-off power of 180hp constant up to 11000 ft.

SALIENT FEATURES :
• Light weight cylinder block with aluminium alloy material
• Plasma iron coating on cylinder bore for wear resistance
• Deep skirt aluminium crankcase design
• Single speed gearbox with propeller pitch control
• Reduction gear box for higher thrust
• High power to weight ratio
• 2.5 kW aircraft alternator
• Indigenous full authority digital engine control (FADEC) system
• Proved target engine power at high altitude (11,000 ft and 17,500 ft)
• Engine performance, fuelling controls and starting strategy proved for higher altitudes
• Endurance testing successfully carried out for 500 hrs on accelerated mission cycle.

Diesel Engine for MALE UAV (Brochure DEFENCE EXPO 2022)
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Specifications :
Indigenous Diesel Engine is high specific power compact & fuel efficient engine developed for Medium Altitude Long Endurance (MALE) TAPAS (Rustom-II) UAV.
The engine develops take-off power of 180 hp up to 11000 ft. The engine is controlled by indigenously developed state of the art FADEC system.
The engine is tested for high altitude performance at Leh (11,500 ft) and Changla (17,600 ft).

Type : 4-Stroke 4-Cylinder Inline
Max. Take-off Power : 180 hp available up to 11000 ft.
Max RPM : 3900 RPM
BSFC : 220 gm/kW.hr
Displacement : 2178 cc
Dry Weight : 195 kg
Other features :
• Common Rail Direct Injection,
• FADEC,
• Turbocharged with Intercooling System

Features :
• Aluminum alloy Lightweight cylinder block
• Plasma coating on cylinder bore
• Deep skirt design
• Single speed reduction gearbox
• Higher power to weight ratio
• Multi-fuel capability Viz. ATF, Diesel
• Constant Speed propeller
• Glow plug control
• Indigenous Full Authority Digital Engine Control (FADEC) System having:
Single lever control
Automatic pitch control
Dual channel, Redundant ECU
Engine health monitoring
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Detailed Info on DRDO VRDE Indigenous DIESEL ENGINE for MALE UAV



DIESEL ENGINE FOR RUSTOM-II UAV (Image DEFENCE EXPO 2022)
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DIESEL ENGINE FOR RUSTOM-II UAV (Brochure AERO INDIA 2023)
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2178 cc Four stroke, Inline four cylinder, Common Rail Direct Injection, Turbocharged Diesel engine fitted with Constant speed Propeller.

Technology Used :
• Aluminum alloy light weight cylinder block
• Plasma Coating in cylinder bore
• Single Speed Reduction Gear box
• Indigenous Full Authority Digital Engine Control (FADEC) system having :
Single Lever Control
Automatic pitch control
Dual Channel, Redundant ECU
Engine Health Monitoring
Application : The engine developed for MALE UAVs.
Status : The prototype has been developed and performance proved at ground & high altitude at Leh (11,500 ft) and Changla (17,600 ft).
Industry Participation : M/s. Jayem Automotives Private Limited., Coimbatore.

Diesel Engine for MALE UAV (Images AERO INDIA 2023)
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DIESEL ENGINE FOR RUSTOM-II UAV (Brochure AERO INDIA 2025)
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Engine Specification : 2.2 L, 4-Stroke, 4Cyl Inline, Turbocharged, Common Rail, Direct Injection Engine
Max Power : 180hp available up to 11,000 ft
Operating Altitude : 32,000 ft
Best Economy SFC : < 210 g/kWh @ Sea Level
Fuel Type : Diesel and ATF K-50
Dry Engine weight : <195 Kg
Installed Engine weight : <270 Kg
FADEC : Full Authority Digital Engine Control systems often incorporate redundancy management to enhance safety and reliability.
 
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Detailed Info on DRDO VRDE Indigenous DIESEL ENGINE for MALE UAV

Diesel Engine for MALE UAV (Images AERO INDIA 2025)
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New Updates
MoD Annual Report 2024-25
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Diesel Engine from Conversion of Automotive Engine for Rustom-II UAV

The high specific power airworthy diesel engine is being designed and developed for Tactical Airborne Platform for Advanced Surveillance (TAPAS) Unmanned Aerial Vehicle (UAV). Indigenously developed engine is capable of producing takeoff power of 180 hp and is expected to replace the imported engine which is currently integrated with TAPAS UAV. During 2024, 650 Hrs Beta Engine Design Validation testing was completed and Integration of Engine on R-II AF-9 Airframe & Engine Ground run through Ground Control Station (GCS) was successfully conducted

08 March 2025
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Indigenous UAV Engine ground testing video report by Manish Kumar Jha of Sansad TV

Tapas UAV engine test : Push make in India story. I fully support this indigenous effort
FADEC system engine, flew 18000ft, it offers higher potential to go 32000ft. We should not kill it, rather nurture it, R&D on it.
I witnessed a great effort by this MSME.
 
He said " develop and produce" ! So, not just M-88 Indian version ? Will our academia get to be a part and learn stuff from non critical process?
A lot of claims are made as part of the deal and pre-deal making as well. It remains to be seen if the promises will actually be fulfilled. There are certain clauses that sometimes allow the OEM to wiggle out of some parts of the contracts. If they do not wish to impart certain things to their local subsidiary, they can also resort to legal proceedings at the courts (if the contract is not watertight).
 

HAL’s gas turbine engine project hit by delayed test-bed approvals, says Parliament panel


A comprehensive review by the Committee on Public Undertakings (CPU) has flagged persistent delays in Hindustan Aeronautics Limited’s (HAL) gas turbine engine development programme, with the panel cautioning that slow approvals for essential testing infrastructure continue to hinder progress.

HAL has been developing two aero-engines under its gas turbine engine programme – “a 25 kilo newton engine” for Intermediate Jet Trainer-class aircraft and a turboshaft engine for helicopters – sanctioned for Rs 441.41 crore, but with Stage II “ongoing since 2018 with no completion in sight.”

The Committee cited delays arising from the “failure to secure critical components on time, due to procurement bottlenecks and delayed approvals for test-bed construction,” as well as land clearance issues.

The Defence Ministry said material research “is being taken up by DMRL (DRDO) and MIDHANI,” with HAL placing orders of Rs 757.82 crore on MIDHANI. While acknowledging HAL’s efforts to partner with DRDO, MIDHANI and global engine makers, the Committee criticised the absence of a clear roadmap for critical testing infrastructure.

“The Ministry’s reply is interim in nature, as the core issue of developing dedicated test-bed infrastructure remains unresolved… The Committee, therefore, desires that the Ministry of Defence expedite this analysis and furnish a definitive action plan, with clear timelines and funding arrangements,” the panel said in its report. The panel emphasised that a “gap analysis… is a critical first step, but it is not the solution itself.”

The Twenty-Sixth Report of the CPU – presented to Parliament in December 2025 and chaired by Baijayant Panda – pulls up the Ministry of Defence (MoD) for failing to resolve long-pending gaps in test-bed facilities crucial for engine certification and development. The Committee comprises senior MPs from both Houses, including Tariq Anwar, Sudip Bandyopadhyay, Kanimozhi Karunanidhi, Milind Deora, John Brittas and Bhagwat Karad.

Indigenisation goals

The CPU cautioned that unless the Defence Ministry urgently operationalises the long-pending test-bed facility, the programme risks further delays, undermining the government’s Atmanirbhar Bharat plans in strategic aerospace systems. The Committee has asked the Ministry to keep it informed of progress and furnish final action-taken replies expeditiously.

Delayed approvals

The Committee reiterated concerns first raised in its Tenth Report, which underscored that the engine project had suffered time and cost overruns due to procurement hurdles and administrative delays. “One of the primary reasons for the delay is the failure to secure critical components on time, due to procurement bottlenecks and delayed approvals for test-bed construction,” it noted. It added that “land clearance approvals were delayed due to bureaucratic inefficiencies, adding more than three years to the project timeline.”

The prolonged delay has forced HAL to write off Rs 159.23 crore as costs it can no longer recover.

Indigenous challenges

Responding to the Committee, the Ministry highlighted the complexity of the project, stating, “HAL took up R&D of two engines pro-actively to become self-reliant… The critical components for such an engine are being designed and developed for the first time in the country and there has been a delay from the estimated time in redesigning them.” It further noted that engine technologies remain closely guarded internationally: “Very few countries in the world have matured gas turbine engine manufacturing technology and they do not transfer the complete technology.”

HAL has ongoing international partnerships – such as its joint venture SAFHAL with Safran Helicopter Engines – and domestic orders placed on MIDHANI for indigenous raw materials. The Ministry added that “a gap analysis of ground facilities for testing of airborne systems is being carried out.”