I don't think it is about range. Range of TOW is also mentioned as 4,200 meters for a missile which weighs ~23 Kg and is shorter in length by about 37%. Not to forget the diameter of Nag is also on higher side as compared to other missile. Spike ER with range of 8 km has a weight of 33 Kg. And is both shorter in length and thinner in diameter. While no data is available on weight of it's warhead, I am guessing it should be in 5-6 kg range.Aditya_V wrote:Rohitvats-> but if NAG range is reduced from 4KM to 2.5Km like Javelin, I am sure it can be brought to around weight of the Javelin.
Only Hellfire is in the same weight class with equivalent warhead weight - but shorter and thinner still. That I think is because it being air-launched, it has a single sustainer motor and does not require launch motor as inherent in ground launched missiles.
My guess is that it has got to do with higher energy required for the lofted flight and to deliver such a heavy warhead. NAG carries a formidable 8 Kg warhead on a lofted profile as compared to 6 Kg on TOW which has a more level flight. IMO, this energy requirement also manifests itself in having a more powerful booster motor to launch the missile from vehicle as compared to other missiles. Booster in those missiles is primarily to aid in safe separation of missile from firer before main motor ignites.
Also, I think the design of the missile also plays a part - launch/boost motor is ahead of sustainer motor and is carried as dead-weight in flight. Other missiles like TOW also have dual motor structure but their launch motors are more simplistic in design.
Check diagram of TOW 2B with simplistic launch motor: http://btvt.narod.ru/4/tow2.files/2b.jpg
HELINA design:http://4.bp.blogspot.com/-h_N2U5e9D2o/T ... er%2B2.jpg
Finally, we need to check if the propellant for the missile itself requires new solution.
PS: JAVELIN also lobs a 8 kg warhead over 2.5 km! And one JAVELIN missile unit weighs at 22 kg...