Indian Missile News And Discussion

[Ravi]

"Nirbhay



Spoke to a lot of ADE people about Nirbhay – except sketchy words, no concrete info.

Most people say it will have a range between 500-1000km. So you can guess what the range will be.



One person said it will have a 1200kg weight.



While I was talking to a GTRE person discussing about their plans for the small engine - I gathered some details on Nirbhay.. He says the engine is not podded outside at all - the engine will be within the fuselage.. Also he says there may be a small air scoop & "dimpled scoops" on the body.. I dont know how true it could be..



The engine is likely to have 350-400kgf thrust and an sfc of 1kg.kgf/hr.



Based on that I have done some calculations.



1200kg – leave out 300kg for warhead, 75kg for seeker+guidance+electronics, 75kg for engine… That leaves us with 750kgs..

Assume ~250-300kg empty weight (fuselage, wings, wing unfolding mechanism etc).. leaves us with 450-500kgs of fuel.. Take the conservative estimate of 450kgs fuel..



An average thrust of 375kgf will give a flight time of 1.2hrs..

A Mach 0.75 = approx 750kmph flight at 1.2hrs gives a range of 900km..



Without doing a full-fledged sensitivity analysis… take a 10% variation on the range will give a range between 800-1000km.. Thats my interpolation..



The 36MT or 50MT engines we ordered from Russia for Lakshya will invariably be used for first few developmental flights of Nirbhay.. There after , what will it be



- whether Russia allows licensed production for the engine

- we develop a small gas turbine on our own (GTRE has a paper design)

- we will have to see a way of uprating/adopting PTAE-7 or a variant of it (though I don’t know how the size works out if you have to put it inside the fuselage & not podded outside)"





Whether the above analysis taken from a post in the link "http://forums.bharat-rakshak.com/viewtopic.php?p=619940" is correct....???