Found an interesting thing while reading a Typhoon interview on Hushkit. Was hoping to ask HVT about it, but not possible now.
Typhoon's AoA limit currently is a slightly more than 24 degrees. As it is for the F-16 apparently. Tejas Mk1's AoA is 24 deg with the FOC software. So the Tejas matches the Typhoon and F-16's AoA limit as of now.
But a new Aerodynamic Modification Kit (AMK) was developed for the Typhoon to allow it to increase the AoA to 34 degrees. They used a leading edge root extension and a strake to do that.
From the Hushkit interview
Before I go back to the interview with Klax I feel I should explain a little background detail about the AMK. Typhoon’s supersonic agility is very impressive, but its current angle-of-attack (AoA) limits at lower speeds are less impressive; a Cassidian (Airbus Defence & Space) led effort demonstrated in 2014 would remedy this. The ‘Aerodynamic Mod Kit’ (AMK) includes re-shaped strakes, leading edge root extensions, and extended trailing edge flaperons. The AMK aims to deliver increases to the maximum wing lift, the AoA limit and the roll rates at High AoA. The strakes will generate vortices that will maintain a controlled airflow over the wing surface even at high angles of attack. When I spoke to EADS test pilot Chris Worning for an article in Aerospace he noted “The first stage was to proof the concept. Do some measurements to see if the strakes did what we thought they would do. And that went very well, the predictions were close. We will fly the Aerodynamic Modification Kit next. We have a mod kit and we’re hopefully going to fly it here this summer (at Manching). This is basically what you could put on a series production aeroplane.”
On the advantages he noted, “First of all they will give us a bit more angle of attack. The maximum angle of attack of the aeroplane increases, which is obviously helpful in close-in combat, if applied intelligently. The second thing they do is increase the manoeuvrability of the aircraft at high angles of attack. So at a given angle of attack, you have for instance, much higher roll rates: so the overall agility of the aircraft increases.”
The Typhoon’s current AoA limit is slightly more than twenty four degrees, approximately the same as an F-16. The new changes are expected to increase the limit to at least 34 degrees which will give pilots in combat a many more possibilities for nose-pointing.
I was wondering if ADA and NFTC could be looking at implementing something similar to improve the AoA limit on the Tejas Mk1 as well, with a similar strake and a LERX. We know that studies were carried out on the Tejas as well to add nose chine and fuselage strakes and they showed better aerodynamic characteristics. Lots of details in IR and JayS's excellent article below.DDR- Tracking the Tejas part 1
IR, could you find out any more on whether these aerodynamic improvements may feature on the Mk1A and find their way back into the Mk1? We do know that the MWF design has a LERX like root extension and the wing tip mounted CCMs which actually showed better Cnβ and higher L/D ratio in the subsonic, transonic and supersonic regimes. Makes logical sense to see it being implemented on the Mk1A for sure.