The SR-71 had the fabulous J-58. It main feature was the bypass tubes to feed the afterburner.

Does anyone know why none of the engine manuf never carried on with that technology?

Probably because there are no need at the moment

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Is that real or from a movie? Can you tell me what aircraft is that and what is he launching?

^ sounds like a reasonable plan.

get some RBEs first.. use them until Uttam is ready.

R-77 and R-73.. great for its time but even the Russians are about to move on

R-77 and R-73 are cheaper than Western counterpart, that the main reason

That MIL TSFC would be IMO very high for an engine like the F135, which has a relatively high bypass ratio of 0.56:1 if I am not wrong and latest technology / highest TIT. For comparison, AL-31F (0.6:1) is 0.67 lb/lbf/h, EJ2000 (0.4:1) is acc. to Wiki 0.74-0.81.

@djcross:

what engine / bypass ratio are you using as a baseline in your comparison?

TSFC is affected by air density and air speed. So their TSFC on cruise is probably very different from these value

If you can put laser weapons on them then they could be lethal, no doubt

The Valkyrie seems me a clever concept but with a caveat or two: given that it is supposed to be launched with a booster and to land on its own belly, why the Air Force and not the Army also?

Second, even a payload of 500lbs (i.e. a pair of SDB) is really too small for anything.
Not any word on sensors also: if it have to autonomously find its own targets, let’s forget about the 2-3 mls pricetag.

It is pretty cheap though, so there is that

Can someone tell me if the Dark sword UCAV program still alive? Or is it terminated? Any recent information?