ThirtykayDEC Posted September 19, 2020 Share Posted September 19, 2020 Hi, I've noticed a strange behavior regarding FBW / CDVE , i still have complete control on the aircraft with those parameters : - HYD 1 Off - HYD 2 Off - EP Off - BATT Off - CDVE 5 Off My input command should have no effect on the aircraft. Normally the CDVE 5 is plugged on HOT BATTERY BUS, So with BATT Off but CDVE 5 On, i should have control, but it seems to be not implemented. Will this strange behavior corrected / implemented ? Because i'd rather prefer have NO CONTROL at all on the aircraft than have unrealistic control. I think the Mirage 2000 would be one of the greatest module if all of the system are completely modeled. But it's already great :thumbup: Link to comment Share on other sites More sharing options...
Tumbleweed1606688689 Posted September 20, 2020 Share Posted September 20, 2020 Hi How you switch off HYD 1 and 2? With engine off? Link to comment Share on other sites More sharing options...
ThirtykayDEC Posted September 20, 2020 Author Share Posted September 20, 2020 Hi How you switch off HYD 1 and 2? With engine off? Forgot to mention it, engine cutoff in mid-air Link to comment Share on other sites More sharing options...
Tumbleweed1606688689 Posted September 20, 2020 Share Posted September 20, 2020 Well, technically if there is windmilling, there is HYD pressure and elec power for CDVE, even if I don't know if it's modeled. Link to comment Share on other sites More sharing options...
myHelljumper Posted September 20, 2020 Share Posted September 20, 2020 Well' date=' technically if there is windmilling, there is HYD pressure and elec power for CDVE, even if I don't know if it's modeled.[/quote'] It is, but you have to be fast, 300kts IIRC. Helljumper - M2000C Guru Helljumper's Youtube https://www.youtube.com/channel/UCK3rTjezLUxPbWHvJJ3W2fA Link to comment Share on other sites More sharing options...
ThirtykayDEC Posted September 21, 2020 Author Share Posted September 21, 2020 (edited) Well' date=' technically if there is windmilling, there is HYD pressure and elec power for CDVE, even if I don't know if it's modeled.[/quote'] Well, i was gliding at the max finesse point which is around 7.5 for the Mirage 2000, and the N% never exceeded 7%, which i think is way too low to power anything. But that's still not normal to me, CDVE are electrical FCS, which means there is no actual physical link between pilot's control and control surface actuators, so without electricity and hydraulics, flight controls must have no effect at all. Edited September 21, 2020 by ThirtykayDEC Link to comment Share on other sites More sharing options...
jojo Posted September 21, 2020 Share Posted September 21, 2020 For sure, if you’re gliding at the best glide ratio, your engine is wind milling. So the engine is driving HYD 1 and HYD 2 through accessory gear box. FBW have 5 channels, and multiple electrical power sources. Engine => Hyd 1 => hydraulic driven ALT => Channel 1 Engine => Hyd 2 => hydraulic driven ALT => Channel 2 28V non-shedded bus => Converter => Channel 3 Battery => Converter => Channel 4 Battery => Ultime Secours (5th Channel) Outboard élevons are commanded by channels 2 & 3. Inboard élevons are commanded by channels 1 & 4. Rudder is commanded by channel 2 & 4. All control surfaces are powered by HYD 1 & 2. EP is only triggered if HYD 2 pressure drops < 160 bars and can provide 190 bars. Normal pressure is 280 bars. So overall, I think that as long as your engine is wind milling, you will have FBW and HYD to fly you to the crash site :smilewink: Mirage fanatic ! I7-7700K/ MSI RTX3080/ RAM 64 Go/ SSD / TM Hornet stick-Virpil WarBRD + Virpil CM3 Throttle + MFG Crosswind + Reverb G2. Flickr gallery: https://www.flickr.com/gp/71068385@N02/728Hbi Link to comment Share on other sites More sharing options...
ThirtykayDEC Posted September 21, 2020 Author Share Posted September 21, 2020 For sure, if you’re gliding at the best glide ratio, your engine is wind milling. So the engine is driving HYD 1 and HYD 2 through accessory gear box. FBW have 5 channels, and multiple electrical power sources. Engine => Hyd 1 => hydraulic driven ALT => Channel 1 Engine => Hyd 2 => hydraulic driven ALT => Channel 2 28V non-shedded bus => Converter => Channel 3 Battery => Converter => Channel 4 Battery => Ultime Secours (5th Channel) Outboard élevons are commanded by channels 2 & 3. Inboard élevons are commanded by channels 1 & 4. Rudder is commanded by channel 2 & 4. All control surfaces are powered by HYD 1 & 2. EP is only triggered if HYD 2 pressure drops < 160 bars and can provide 190 bars. Normal pressure is 280 bars. So overall, I think that as long as your engine is wind milling, you will have FBW and HYD to fly you to the crash site :smilewink: I agree with you, i will try flying straight but i have one more question : How is it possible to power HYD with only 7% of N , knowing the fact that the pump operate at 6000 rpm ? Link to comment Share on other sites More sharing options...
jojo Posted September 21, 2020 Share Posted September 21, 2020 (edited) I agree with you, i will try flying straight but i have one more question : How is it possible to power HYD with only 7% of N , knowing the fact that the pump operate at 6000 rpm ? That part may be wrong indeed. But it would be easier if we could check a track :smilewink: Edited September 21, 2020 by jojo Mirage fanatic ! I7-7700K/ MSI RTX3080/ RAM 64 Go/ SSD / TM Hornet stick-Virpil WarBRD + Virpil CM3 Throttle + MFG Crosswind + Reverb G2. Flickr gallery: https://www.flickr.com/gp/71068385@N02/728Hbi Link to comment Share on other sites More sharing options...
El Chapo Posted September 21, 2020 Share Posted September 21, 2020 In fact EP will drain your battery within seconds, so no "fly to the crash site", but a few seconds to get in a suitable bail out position... Link to comment Share on other sites More sharing options...
jojo Posted September 21, 2020 Share Posted September 21, 2020 In fact EP will drain your battery within seconds, so no "fly to the crash site", but a few seconds to get in a suitable bail out position... He said he turned EP off and EP only starts if the pressure drops below 160 bars. So the remaining question is how much pressure can the wind milling provide ? Mirage fanatic ! I7-7700K/ MSI RTX3080/ RAM 64 Go/ SSD / TM Hornet stick-Virpil WarBRD + Virpil CM3 Throttle + MFG Crosswind + Reverb G2. Flickr gallery: https://www.flickr.com/gp/71068385@N02/728Hbi Link to comment Share on other sites More sharing options...
El Chapo Posted September 21, 2020 Share Posted September 21, 2020 (edited) Look at the start-up sequence : at which RPM do HYD lights disappear? You have your (in game) answer. With enough speed and air density you can keep something between 15 and 20% RPM but this just to wait for in flight start-up sequence. Who would want more than that??? Edited September 21, 2020 by Габихан Link to comment Share on other sites More sharing options...
ThirtykayDEC Posted September 21, 2020 Author Share Posted September 21, 2020 (edited) Ok, just tested the thing ( track attached ) On ground: HYD 1 and HYD 2 disappear at around 19% RPM at MSL In mid-air: Condition of the test: Engine : CUT-OFF Batt : ON EP : OFF In-flight with -10° of pitch, windmilling up to 33% N is achievable, so in other terms : HYD 1 & HYD 2 came back online at 12% N thus regaining control on the aircraft. ( above 20000 ft MSL ) To conclude, i was wrong, my bad, sorry. Nevertheless i would be happy to see CDVE 5 working one day :)M2000.trk Edited September 22, 2020 by ThirtykayDEC Link to comment Share on other sites More sharing options...
jojo Posted September 22, 2020 Share Posted September 22, 2020 Anyway that was an interesting discussion about the Mirage 2000 flight control system :thumbup: Mirage fanatic ! I7-7700K/ MSI RTX3080/ RAM 64 Go/ SSD / TM Hornet stick-Virpil WarBRD + Virpil CM3 Throttle + MFG Crosswind + Reverb G2. Flickr gallery: https://www.flickr.com/gp/71068385@N02/728Hbi Link to comment Share on other sites More sharing options...
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