rohitvats wrote:Why don't we use the technology mastered with Brahmos to develop smaller land attack missiles like SLAM-ER?
Yes, it is being reused. I strongly speculate reusable
components like control systems, guidance package, GPS/INS, programmable waypoints will be used in Nirbhay or similar programs.
rohitvats wrote:Can we reduce the top speed to, say Mach 1.0-1.5, or even high sub-sonic, and thereby reduce the amount of propellant required and cut down on the weight?
No, we cant. That is why I put emphasis on reusable earlier. A ramjet design inherently requires a 700 kg design like Akash for 25 km or 3000 kg design like Brahmos. A lot of propellant is burnt to boost speed from zero to Mach 2.5-3 and sustain it at that level. So we cannot reduce propellant and lower speed in a ramjet design. The best weight optimization possible for a ramjet design is seen on Brahmos Air version. Using launch aircraft speed to dispense solid booster and reducing warhead weight.
rohitvats wrote:Is seeker tech the limiting factor or something else - like the IP with Russians?
Propulsion design is the limiting factor. All our missiles are surface launched missiles, and those propulsion designs cannot be used for A2G. Once we master turbofan tech with Nirbhay, we may see tech spinoffs. Similarly the Astra propulsion pack can be suitably modified.