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2

To add to what has been said. Rolls-Royce abandoned plenum chamber burning (PCB) in the end, because they could not get it to work. There were also unresolved intake design issues over hot gas reingestion, and over the conflicting design demands, especially intake size, for VTOL vs. supersonic flight. The supersonic Harrier was basically abandoned because it'...


4

The report of the completion of the ICAO fact-finding investigation confirms that not attempt to contact the aircraft was made: No attempt was made by the USSR to contact the crew of KE 007 by radio on the distress frequency 121.5 MHz or on any other VHF or HF frequency. The report also contains a summary of an interview with the pilot of the interceptor ...


2

I have made this answer a community wiki, so we can avoid pointshopping and flood of conflicting answer. Only edit this if you are sure of what you think you know. Kick the tires and light the fires This phrase refers to the pre flight inspection, kicking the tires, a pilot performs on his/her aircraft before hopping in and starting the engines, the fires ...


3

As Arkem stated, they use both, but the primary reason for the use of a simplified parachute is just that it's simplified. In general Airborne troopers are supposed to fall where they are told to, as intended by the pilot, as instructed by the wing commander, as ordered by the REMFs. When you give that same trooper the ability to adjust their flight path ...


4

This was the lowest mass solution at the time of P1127 development. Remember that weight is at a premium for vertical take off. The first hover tests of the P1127 prototype were only possible with fuel for only 3 minutes in the tanks and 700 lbs of equipment stripped from the airframe. A conventional landing gear would had made hovering impossible in 1960. ...


2

The reason you can't find them is that they don't exist. All US military references used the commercial designations for these engines. Why? Because (except for the YC-15) the airframes were purchased as Commercial Off-the-Shelf (COTS) and then modified for their mission. Since the engines were already integrated into the aircraft and had an existing ...


51

You’ve made some faulty assumptions there as the military does use square chutes for specialist parachuting, but rounds are popular for several reason: Static-line round chutes are deployable en-masse from a much lower altitude / height than square chutes. The lowest that we can drop the round chute is 400’ (which is very low) versus circa 1500’ for a ...


0

Analog, as in measuring a signal like voltage of an op-amp, length of a slide rule, liters of fuel in the tank. Digital, as in: this car has four wheels, plus one in the boot. Analog electronics are the original way that control loops were constructed. They are blazingly fast, but: they drift; they are subject to external distortion like electro-magnetic ...


20

For being remotely controlled, drones need to emit and receive a radio signal. If the outgoing signal contains a video feed, it will be high bandwidth and be like a beacon announcing the location of the drone. By pre-programming the flight path and using GPS location fixes, the drone will be passive and not emit radio signals. Before GPS, high precision ...


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