David Hingtgen Posted November 8, 2006 Share Posted November 8, 2006 A JT3C-6's water injection rate (707-120 engine) is 667lbs/min with a 5,913lb tank in the plane. KC-135 and B-52 engines are similar. Presumably that's so it can make multiple takeoffs without refilling----they only accept distilled water, and there's plenty of places that wouldn't be available. Fill it up at New York, then fly around the world (literally) and end up back at New York. Water injection is limited to 2.5 minutes per takeoff. I'm guessing the main reason for not having an afterburner is nozzle maintenance and fuel burn. A "low" setting for an afterburner is quite possible. Plus it's kind of a waste to have such a system installed but only ever operated at low power--water injection is certainly easier and cheaper. Quote Link to comment Share on other sites More sharing options...
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