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HAL Tejas | Updates, News & Discussions-[Thread 2]

one of the Tejas Mk1 prototypes converted into a Tejas Mk1A prototype, carrying 2 Astra Mk1 BVRAAMs

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Delta Dagger

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Images posted on Twitter by Grp Cpt HVT and pic credit Praneeth Franklin
 
LCA tejas test fires Astra Mk-1 BVRAAM !!!



Tejas Mk-1A likely to be deployed on a new IAF Operational Airbase !!!



MASSIVE BREAKING NEWS !!! Indian Air Force to order 100 more Tejas Mk1A instead of planned 50 more order !!! This is huge boost for Indian Aerospace Industry and for the #Aatmanirbhar_Bharat campaign !!!


 
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Yes indeed this is massive!

The IAF has moved a proposal to the Ministry of Defence for acquiring between 90-100 more Tejas Mk1A fighters! The preliminary estimate for this deal is ~ USD 8 billion, although we will only know the real price when the deal is announced finally.

That would mean 40 Tejas Mk1 fighters + 83 Tejas Mk1A order + ~90-100 Tejas Mk1A planned for a total of ~213-223 Tejas Mk1A fighters (given that the first 40 will be upgraded later to Mk1A standard)

IAF to order around 100 more Tejas Mk1A fighter jets for over USD 8 billion
IAF to purchase additional 100 Tejas Mk1A jets

 
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First images of the DRDO developed indigenous Advanced Self-Protection Jammer (ASPJ) on the Tejas Mk1A prototype.

This is the most important piece of equipment that we had yet to see on the Tejas, although we know it was in testing from ADA's Annual Report 2022-23.. Fantastic to see it in flight.

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Image credit Akshay Daniel on Instagram
 
This is an incredible footage of what is called a "hesitation roll". The aircraft flies nearly straight and level, rolling 90 degrees at a time and then 'hesitating' before rolling the next 90 degrees. The pass is completed with 4 such 90-degree rolls.

Although, this looks fairly simple, there is an enormous amount detail that is visible only in a video of this quality.
Notice carefully how the nose moves around to initiate each 90-degree roll and then settle to different AoA at every hesitation.

In a legacy aircraft, the pilot needs to understand these and to develop the feel to perform this maneuver.
To perform this maneuver this precisely, it would take a pilot 100s, if not 1000s of flying hours.

On a fly-by-wire aircraft, the pilot's workload is dramatically decreased!
he just needs to learn when and how much to rotate the stick, and release. The flight computer can take care of the rest.
To achieve this, the designers must not only handle the flight controls of this incredibly nimble and (in the case of LCA), statically unstable platform, but also take care of feedback to the pilot.

Imagine driving a car where no matter how hard you brake, accelerate or turn, the controls feel the same!
Without feedback, you'll need to drive only by your sight, experienced G-forces and remembering exactly how much you have depressed each pedal or turned the steering wheel!
A fly-by-wire aircraft would feel exactly the same as there are no mechanical linkages between the pilot's controls and the control-surfaces! The responses must be artificially generated.

There are many critical aspects which give rise to good "feel" and control.
Simple things like the shape, material and texture of the handle matter. Even type of gloves issued matter.
But more importantly, the latency between the command and the response of the aircraft matter. The response must not be jarringly sharp or too muted!
Another critical factor is feedback to an input. For example, the controls must feel heavier as more demanding commands are issued.

For example, as the pilot should feel more resistance as the stick is moved further to command faster roll-rates!
This is achieved through springs (like you find on your accelerator pedal in your car), and small hydraulics.
Designers & test-pilots iterate get the balance right over many iterations on ground and test-flights (within the ambit of human subjectivity).

So, here's one more example, where this is only possible on a home-grown design. A foreign OEM will not change these on inputs from our test or squadron pilots.

Lessons from center-stick designs are informing and shortening the design of side-stick, but the latter is a new beast.
The learning on the latter will influence every side-stick design from here on including HLFT, Mk2, TEDBF and AMCA.

Credit: Indranil Roy
 
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