SilverSho0t Posted August 15, 2016 Posted August 15, 2016 Hello, i find that because after take missile i lost my engine and after to land i down my landing gear but noffing happens (emergency landing gear system not work too). Before I seem to remember that it worked but since i don't know what update this not work.
mattebubben Posted August 15, 2016 Posted August 15, 2016 (edited) Are you sure it was engine related and not Hydraulics related. (Having the Hydraulics systems damaged when you got hit) Or it could be due to the aircraft Loosing electrical power. (Electrical power relies on the engine so when you loose the engine you will loose all electrical power after a certain period of time) Edited August 15, 2016 by mattebubben
Rlaxoxo Posted August 16, 2016 Posted August 16, 2016 Are you sure it was engine related and not Hydraulics related. (Having the Hydraulics systems damaged when you got hit) Or it could be due to the aircraft Loosing electrical power. (Electrical power relies on the engine so when you loose the engine you will loose all electrical power after a certain period of time) No, you pretty much can't lower the gear once the engine is off [sIGPIC][/sIGPIC] Youtube Reddit
SilverSho0t Posted August 16, 2016 Author Posted August 16, 2016 (edited) Are you sure it was engine related and not Hydraulics related. (Having the Hydraulics systems damaged when you got hit) Or it could be due to the aircraft Loosing electrical power. (Electrical power relies on the engine so when you loose the engine you will loose all electrical power after a certain period of time) I test multiple time and everytimes not work same for my friends. Same if it's you who cut the engine in flight, not a missile who destroy engine. Edited August 16, 2016 by SilverSho0t Add : Same if it's you who cut the engine in flight, not a missile who destroy engine.
Zeus67 Posted August 16, 2016 Posted August 16, 2016 No, you pretty much can't lower the gear once the engine is off Engine off == no hydraulic power == no landing gear nor flight controls. "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." "The three most dangerous things in the world are a programmer with a soldering iron, a hardware type with a program patch and a user with an idea."
Rlaxoxo Posted August 16, 2016 Posted August 16, 2016 Engine off == no hydraulic power == no landing gear nor flight controls. Is there any backup system IRL which allows the gears to come down just by gravity alone? [sIGPIC][/sIGPIC] Youtube Reddit
Aginor Posted August 16, 2016 Posted August 16, 2016 There is an emergency gear lever. Don't know how (and if) it works though. DCSW weapons cheat sheet speed cheat sheet
Aginor Posted August 16, 2016 Posted August 16, 2016 Ok, I just hopped in and tried it. It seems it doesn't work yet. I tried that lever and cycling the gear, and nothing happened. I also think the hydraulics system is still WIP, because I can't imagine that the hydraulics fail that quickly. I think in real life it is a emergency reservoir system. The manual also seems to hint at that. DCSW weapons cheat sheet speed cheat sheet
Zeus67 Posted August 17, 2016 Posted August 17, 2016 There is an emergency gear lever. Don't know how (and if) it works though. We'll check on the emergency gear lever. Ok, I just hopped in and tried it. It seems it doesn't work yet. I tried that lever and cycling the gear, and nothing happened. I also think the hydraulics system is still WIP, because I can't imagine that the hydraulics fail that quickly. I think in real life it is a emergency reservoir system. The manual also seems to hint at that. The hydraulics have a triple redundant system but it still requires a working engine. Losing the engine means losing not only the hydraulics but also the electrical power and very likely the FBW system. So at this point it is better to just eject than trying to ride an unresponsive aircraft. I will check on the function of the emergency pump but I doubt it runs on electrical power alone. "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." "The three most dangerous things in the world are a programmer with a soldering iron, a hardware type with a program patch and a user with an idea."
Azrayen Posted August 17, 2016 Posted August 17, 2016 I will check on the function of the emergency pump but I doubt it runs on electrical power alone. It does, though. With main CC bus so battery is enough (for a short time, it needs lots of amps). It's presurizing the #2 hyd circuit up to 190 bars (normal pumps = up to 280 bars), and it's automatically started when #2 pressure drops below 160 bars. NB this #2 circuit powers FBW, NWS, emergency L/G down and emergency/parking brakes. It does not power (normal) landing gear nor airbrakes, shockcones, scoops and slats. Also another factor to take into account: unless it's brutaly seized, a powered-down/failed engine will still windmill in flight most of the time (depending on airspeed and AoA). It should be enough to drive the hyd pumps, even if more slowly (= pressure drops not so quickly compensated for) than usual. Finally, there exists an isolation valve for misc hyd devices on the #1 circuit. Its goal is to save hyd pressure for most important things such as flight controls. It isolates airbrakes, slats, gear... etc. and closes automatically when accumulator (pressurized hyd tank) #1 level drops below 3.5 liters (normal 8l, full 9l).
Aginor Posted August 17, 2016 Posted August 17, 2016 (edited) EDIT: Double post because I am too dumb to use a browser. See my real post below. Edited August 17, 2016 by Aginor DCSW weapons cheat sheet speed cheat sheet
Aginor Posted August 17, 2016 Posted August 17, 2016 Also now that I think about it it seems that the hydraulics gauge (and the switching of the gauge to the other reservoir as described in the manual) wasn't working. I am not sure that the gear not moving is a hydraulics problem, it happens even a few seconds (perhaps even instantly) after the engine went down (I used the kill switch), while it is still spinning, so there should still be hydraulics pressure I think. DCSW weapons cheat sheet speed cheat sheet
Zeus67 Posted August 17, 2016 Posted August 17, 2016 Also now that I think about it it seems that the hydraulics gauge (and the switching of the gauge to the other reservoir as described in the manual) wasn't working. I am not sure that the gear not moving is a hydraulics problem, it happens even a few seconds (perhaps even instantly) after the engine went down (I used the kill switch), while it is still spinning, so there should still be hydraulics pressure I think. Hydraulic pumps stop working after engine RPM drops below certain value. I can't remember which. "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." "The three most dangerous things in the world are a programmer with a soldering iron, a hardware type with a program patch and a user with an idea."
Zeus67 Posted August 17, 2016 Posted August 17, 2016 It does, though. With main CC bus so battery is enough (for a short time, it needs lots of amps). It's presurizing the #2 hyd circuit up to 190 bars (normal pumps = up to 280 bars), and it's automatically started when #2 pressure drops below 160 bars. NB this #2 circuit powers FBW, NWS, emergency L/G down and emergency/parking brakes. It does not power (normal) landing gear nor airbrakes, shockcones, scoops and slats. Also another factor to take into account: unless it's brutaly seized, a powered-down/failed engine will still windmill in flight most of the time (depending on airspeed and AoA). It should be enough to drive the hyd pumps, even if more slowly (= pressure drops not so quickly compensated for) than usual. Finally, there exists an isolation valve for misc hyd devices on the #1 circuit. Its goal is to save hyd pressure for most important things such as flight controls. It isolates airbrakes, slats, gear... etc. and closes automatically when accumulator (pressurized hyd tank) #1 level drops below 3.5 liters (normal 8l, full 9l). Thanks about the EP info. Our data did not include that. Be aware that with no alternators, which are powered by the main hydraulic pumps, there are only about 30 minutes of charge in the battery and most systems are disconnected in order to power FBW and the Emergency Pump as well. We will enable the EP to use electrical power only instead of engine power in order to keep hydraulic pressure on engine failure. "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." "The three most dangerous things in the world are a programmer with a soldering iron, a hardware type with a program patch and a user with an idea."
Azrayen Posted August 17, 2016 Posted August 17, 2016 (edited) My pleasure; it's from the old RDM manual. Hydraulic pumps stop working after engine RPM drops below certain value. I can't remember which. Yeah, we already discussed that somewhere on the forum. I don't remember the exact value, but it was relatively low (15-20% RPM), significantely lower than the alternators going offline value (45%). We know the nominal quantity provided by normal pumps operating normally (110 liters/minute each), but IIRC we didn't have the value for "consumption" i.e. how much each movement of flight control surfaces, or other devices "eats" (drinks). Will try to search for the post later, no promesses. About the 30 minutes: sure, but if no alternators comes from no engine, then flight will cease sooner than that :pilotfly: Edited August 17, 2016 by Azrayen
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