Indranil Roy Profile picture
Sep 1 11 tweets 2 min read
Many have expressed some surprise and confusion on the 6,500 crores allotted for building Tejas, testing and certifying Mk2 prototypes.

Some find it high! Actually, it is very cheap.
We paid over twice that amount (~13,500 crores) for "India Specific Enhancements" on the Rafale 5 years back. These enhancements were only related to avionics and new weapons.
By the way, most of these enhancements were in the planned iterative development path Rafale any how. But somebody needed to fund that development and testing.

India did. And unfortunately, that cost was only amortized on 36 aircrafts!
It was a win-win for Dassault though. It can pitch these enhancements to all other current and future customers.

And by the way, Dassault did nothing wrong. This is how development in military aviation goes.
So, 6,500 crores for setting up rigs and build, test-fly and certify new aircrafts should only pleasantly surprise you.

And hopefully these 6,500 crore is amortized over far more than 100 aircrafts. I hope for 200+ Mk2s for India and another 100+ in exports.
But this is way beyond Tejas Mk2. This is investment in the aviation industry in the country.

India has only managed to deliver half a squadron a year to IAF. If IAF has to arrest and reverse the decline of its squadron numbers, this number must be at least quadrupled.
If we want to also export. We must find a way to reach a cumulative production rate of >60 aircrafts per year between Tejas Mk1A/trainers/Mk2/HLFT, AMCA & TEDBF.

But developing mature assembly lines with established suppliers from all tiers takes 5-10 years.
We have only scratched the surface of building such an industrial-complex with the Tejas Mk1 IOC/FOC. Tejas Mk1A and Mk2 can really help mature this industry which can take on the complexity of AMCA/TEDBF.
Also, there is no substitute of learning in the field. LRUs that are adopted from Mk1 to Mk1A are more mature just because of the refinements that have gone in based on operational experience. The same will go for LRUs that are adapted from Mk2 to AMCA/TEDBF.
Finally, and MOST importantly: This 6,500 crores will let India retain and hone the skills and capacity of the people in this industry. ALL major aerospace players know the importance of this and implement it to the tee.

India has not and paid a HUGE price. Time to reverse that
In summary, the ROI of 6,500 crores is SIGNIFICANTLY larger than just the certification of Tejas Mk2. The babus have done their part (albeit belatedly).

It is time now over to HAL and ADA to deliver the goods and on time.

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More from @Indrani1_Roy

Sep 1
What a beautiful design by Prof Das!
@prody24445539

This is the bane of or R&D setup of India. That ideas like this NEVER see light of day. And in 2015 we imported nearly 200 light trainers!

Why? Why? Why?
@Rajeev_GoI, I know your love for aviation and look up to you as an enabler. Can we as a country continue to waste such capabilities and opportunities? Can a cell and associated funds be set up to foster such private enterprises?
We are speaking of just a few 10s of crores a year. Perhaps deserving ideas can be brought forward up to the point where industry players can adopt them. At that point the industry can pay for the developmental costs and pay royalties to the developer.
Read 8 tweets
Aug 30
I am going to reply to this tweet. @bheemmz please don’t be offended. Nothing against you. Here “you/yours” refers to a 3rd person. This tweet just contains some often-repeated misconceptions which need to be clarified. My discussion today is going to be limited to fixed wings.
@bheemmz 1. This tweet conflates design and manufacturing expertise and where these expertise lie within the Indian aerospace ecosystem. Also the idea that canards on fighter are some super-duper technology needs some debunking.
2. First, design & manufacturing expertise are completely different. Designing a complex system is difficult. But designing a system that can be built and operated with ease is more difficult. Indian aero-community is currently learning to overcome this second level of difficulty
Read 34 tweets
May 31
This weekend I was away and a bunch of you have asked my thoughts on:

1.About first batch of Tejas accepted with “concessions”
2.The reduced MRFA numbers
3.License manufacture

My thoughts ...
1.1 Tejas accepted with concessions: Can anybody here show me a modern fighter whose first few batches were accepted without any “concessions”? These are simple Google searches away. I will wait.
1.2Forget the rest of the world, let’s stick to IAF. What was the state of Jaguar when it was inducted? Read this EXCELLENT article by Kapil Bhargava: bharat-rakshak.com/IAF/aircraft/c…
Read 16 tweets
Mar 28
Okay. There is a lot about LCA Tejas production rate by HAL. Now that we know SP-27 to SP-35 have taken to the air within 4.5 months, does it mean that HAL is capable of producing Tejas at 24 aircrafts/year.

Short answer: No.

Long answer: please read on.
1. Unlike many things, the production rate of fighters once the underlying technology has stabilized is a directly related to the number of fighters ordered. It is fairly complex endeavour. But let us understand the first principles.
2. The primary problem is that the machinery, tools, jigs etc. that are required to build state-of-the-art fighters are a few times more expensive than a fighter itself. Therefore, how many such machinery, tools, jigs should be brought is directly related to number of orders.
Read 25 tweets
Dec 29, 2021
LCA Mk2’s nose cone is smaller in length (~10%) and diameter (~10%) than Mk1s even though it will house a more powerful radar and internal IRST. In this thread, I want to show you how this is ONLY possible by build, learn, repeat. Instead of read (papers/brochures), think, repeat
But first, what does a slimmer nose mean for a single-engine fighter aircraft? 10% reduction in diameter means 21% reduction in cross sectional area. Although this seems small, it has a large impact on aerodynamics. And it is not easy to achieve. More on that later.
Narrow fuselages needs to displace less air to move through it. Hence, power-constrained SE fighters gain most from such optimizations. They can travel faster and sometimes even turn faster. Also, smaller radome means smaller weight which also translated to lesser drag.
Read 15 tweets
Nov 22, 2021
@arunp2810 sir,

I am writing this after a lot of deliberation. It is a rant but here it is for what it is worth. Please know that I would not have replied unless I respected you immensely and cared for opinion greatly.
1.Like you, I don’t consider license production as indigenous. Our own engine development is lagging. But is the lacuna only in the development community? Afterall, we are churning out 350 HP engines and transmissions in huge volumes with comparative ease.
2.Then why can they not be scaled up for military use? Because there is no volume to scale up. For Arjun, until recently there was only an order for 124 engines. Who will set up factory for 124 engines and their parts? Number of engines required for ships is even lower.
Read 25 tweets

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