Oct 23, 2015 · The plot for fan blades would look not much different. The very thin, uncambered airfoil of a supersonic propeller and the added wave drag lower the maximum efficiency, but hold efficiency up into supersonic air speeds. Note that the propeller on the XF-84H Thunderscreech did move at supersonic speed. There is nothing inherent in propellers ...

Mar 16, 2017 · So you have at most nine minutes of supersonic dash available to you. As mentioned above, while an F-16 is capable of a maximum speed of Mach 2, it can't do this unless it's in a clean configuration, that is, it does not have any external stores on the jet which create a lot of parasite drag and prevents supersonic flight with ordnance on board.

Oct 7, 2023 · Also at supersonic speed this sudden change in speed comes with a relevant change in pressure (lower on the upper surface; higher on the bottom) but this time the pressure acts everywhere perpendicular to the flat plate's surface i.e. it always possesses a component pointing backward: at supersonic speed, even considering an inviscid fluid, the ...

Mar 26, 2015 · For example, at 700°C the speed of sound in air is 625 m/s. Since thrust is mainly determined by the difference in entry and exit speeds of the air flowing through an engine, a higher speed than flight speed is required for positive thrust. Low supersonic flight speeds are entirely possible with a convergent nozzle. Long Answer: Better not.

Oct 23, 2015 · The inner part of the fan and all the compressor stages belonging to the core engine experience flow at subsonic speed, even if the whole engine is flying at supersonic speed (see picture below). To make ignition as complete as possible, the flow speed is continuously reduced the closer you move to the fuel injectors. Since the air is heated in ...

Oct 21, 2015 · The tips of the fan blades of a modern turbofan also move at supersonic speed, so the supersonic propellers on the Tu-95 do not create a direct disadvantage. By keeping the relative thickness of the blade near the tip low, the drag increase can be kept at tolerable levels.

Feb 19, 2015 · The fastest propeller-driven aircraft is either the turboprop-powered TU-114 with a measured top speed of Mach 0.73 or the turboprop-powered XF-84H "Thunderscreech" with a design top speed of Mach 0.9 and an actual top speed of either Mach 0.83 or Mach 0.7 (sources disagree). The latter is an indication of why supersonic propeller-driven ...

Oct 12, 2014 · Note that the high circumferential speed of a large fan blade will still mean that its tips work at around Mach 1.5, but the subsequent compressor stages will operate in subsonic conditions. A scramjet is possible with fuels with supersonic flame front speeds and rapid mixing of …

Aug 30, 2020 · A supercruise engine must deliver supersonic exhaust flow without using an afterburner. Luckily, in a hot gas the speed of sound is much higher than in a cold gas. So as long as the exhaust is not cooled before exit, its high exit velocity stays subsonic within the engine and only "looks" supersonic relative to the outside air.

Jul 17, 2015 · Remember that lift is proportional to the square of the speed. You can now see the huge discrepancy between lift on either side as airspeed increases. To answer your question directly, the R22 would need to fly at 530 fps to approach supersonic tip speed which equates to about 330 kts which it can't get anywhere near achieving. PS.