srin wrote:^^^ I don't understand the confusion, saar.
Specific impulse of rocket is around 200s, so the SFDR is much much more efficient. Interestingly, the ramjet's specific impulse is around 800 (per wiki), so the SFDR is more efficient than a ramjet (something that I hadn't thought of).
The range is factor of both the specific impulse and how much fuel/oxidiser is carried, no ? I honestly didn't get the calculation you presented above.
Unless someone can correct my understanding of impulse.
SFDR missile is suppose to achieve 1200 sec impulse. It means the fuel + aerodynamics allows it a flight time of 1200 sec. Calculating a straight line theoretical range of travelling at Mach 3 for 20 minutes, gives a range more than 1000 KM!
It is also claimed SFDR is ranged to be 340KM. Even if I consider practical constraints, 1200 sec, should give us more than 340KM range.
So either 1200 sec impulse is wrong or we are understating the range... by a lot.
Does any one believe a Mach 3 missile flying for full 20 minutes, will reach only 340KM?