I'm reading the manual of J79 engine, and I just saw this chart:
Does anybody know what "military band" means?
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2$\begingroup$ Possibly related $\endgroup$– PondlifeOct 12, 2021 at 17:37
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3$\begingroup$ It's the part of the curve where the brass instruments play Sousa marches of course! $\endgroup$– GdDOct 12, 2021 at 19:29
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2 Answers
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Military Power is the maximum rated thrust from the core engine, that is, without afterburner. The Throttle Angle can vary within a few degrees when the engine is at Military Power due to tolerances in the fuel control system.
On a chart this variability (70-75 degrees) shows as a strip or band marking the minimum and maximum values of throttle angle. Therefore, the "Military Band" represents the range of angles you can expect to see the throttle when the engine set to produce Military Power, or maximum non-afterburner thrust.
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The F-4 Phantom throttles have an idle position and a military power position. This diagram shows nozzle position and diameter, as well as RPM at military power, otherwise known as the "military band". The reason the lines flatten out is that above that the throttles control the activation of the afterburners, but do not change the RPM of the engine itself or the nozzle configuration. There is a copy of the Phantom flight manual here that explains it in more detail.
answered Oct 12, 2021 at 17:44