Why India Sticks With Modernized AL-31FP Engine Over AL-41F-1S for Su-30MKI Upgrade, Despite Latter Having Better Performance

Why India Sticks With Modernized AL-31FP Engine Over AL-41F-1S for Su-30MKI Upgrade-min.webp


In a move that has raised some eyebrows in the international defence community, India has opted to stick with modernized AL-31FP engines for its Su-30MKI "Super-30" upgrade program, despite Russia's state-owned arms exporter, Rosoboronexport, advocating for the superior AL-41F-1S engine.

While the AL-41F-1S, also known as the article 117S, boasts an 18% increase in thrust generation, improved fuel efficiency, and seamless compatibility with the Su-30MKI airframe, India's decision-makers have cited cost considerations, technology transfer opportunities, and the existing logistical and maintenance infrastructure supporting the AL-31FP as key factors in their choice.

The AL-31FP, though less powerful than its successor, has proven its reliability and effectiveness over the years, meeting the operational requirements of the Indian Air Force (IAF).

Moreover, India's plan to manufacture 240 AL-31FP engines domestically underscores the country's emphasis on self-reliance in defence production.

The decision also highlights India's pragmatic approach to defence procurement in a complex geopolitical landscape.

While the AL-41F-1S undoubtedly offers superior performance, the transition would necessitate substantial investments in upgrades and training, a burden India seems unwilling to bear under current budget constraints.

Despite Russia's disappointment with India's decision, the move reflects a carefully calculated balance between performance enhancement and fiscal prudence.

The modernized AL-31FP engines, with their upgraded FADEC-type digital control system, offer a significant improvement over the existing powerplants, ensuring that India's Su-30MKI fleet remains a formidable force in the region.

As India continues to strengthen its defence capabilities, the AL-31FP engine upgrade represents a strategic choice that prioritizes stability, reliability, and self-reliance.
 
Bearing material of the Inter Rotor Bearing (IRB) of AL31FP to be changed to higher grade steel will make it at par with AL 41 ... But a distinct advantage of AL 41 engine is doing away with ISB Inter Shaft Bearing and no flexible shaft ... A great upgrade ... Also, the turbine blade tip clearances are easier to manage in overhaul as they are shrouded blades. More so, the Graphite sealing ring after IRB has improved fit with IRB location shifted forward for better loading .... In short AL 41 was the best choice to opt for the long run but in IRB material can be changed to improved steel grade it will be good for SUs
 
According to cost and changes required to install engine it's the best course to skip this and wait for 51 engine. Not every upgrade is worth the cost.
 
We should make additional 126+ Super Su-30MKI powered by AL-41 engines and change present AL-31 engines but seek 80% TOT for AL-41 engines ! Upgraded engines will make Super SU-30MKI even superior to SU-35 !
Superiority doesn't come by thrusts alone. What is the point of extra thrusts when none of your missions need it. Of course we could think super cruise.

More importantly, we need to take ownership of changing the skin of MKI to Tejas composite skins. That along with new lpi radar, ram coatings will make it superior to 35.
 
Engines were always the Achilles heels of Russian aircraft technology. Mainly their efficiency and reliability have stayed at least 10 years behind the west.

If this were a technology transfer deal, we should have been all over it. As us being a zero, anything by Russians would have been a net positive. But alas, AL-41 woujd be another off the shelf sale at best. So, no point putting good money into an obsolete product.

Rather invest into private players such as Kirloskar, PBS India, Godrej & Boyce etc. who have the wherewithal to design a turbojet successfully.
Can't India produce at least a prototype of AL-41 fighter engine with reverse engineering like Chana always do. If successful then we may go for production such engine.
 

Forum statistics

Threads
3,425
Messages
33,704
Members
2,045
Latest member
Anand
Back
Top