SOURCE: RAJESH AHUJA / FOR MY TAKE / IDRW.ORG
A few years ago when HAL announced that it will be working on Lead-in fighter training (LIFT) that will be based on the Tailless Compound Delta configuration of the LCA-Tejas airframe it was unusual setup for a LIFT aircraft since many manufacturers to reduce production costs and due to inherited issues with the delta configuration avoid using them in the advance jet trainer jets.
It was not long into the LCA-LIFT program before HAL seems to have realized that it was trying to swim against the tide and announced plans to develop a Hindustan Lead-in Fighter Trainer (HLFT-42) aircraft that likely will have a much more traditional swept wing design which is often found in the LIFT aircraft types around the world.
In delta configuration, High drag force at low speeds is often observed and can become handy for a pilot that is not well-versed in handling the jet. The Delta wing has no benefits at slow speed and maneuverability as that will come from powered vector exhaust and not the wings, The benefit of the Delta wing at high speed is not what the operator might want when training a pilot who is still getting familiar with sub-sonic speeds.
A delta wing also comes with the side effect of drag, and both lift and drag increase with the angle of attack until a point where drag greatly exceeds lift.
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