Majesco Posted January 9, 2010 Posted January 9, 2010 I find a problem with advanced flight model aircraft in LOFC, both Su-25A and Su-25T's engines will be stopped working after about 1 minute or longer the plane flies at upside-down position (or inverted pass) I also give this question to a man, then he asked some friends work as Su-25 pilot in Russian airforce, they confirmed the real Su-25 has no that phenomenon. So, i need other ideas from ED on this problem ? Is it a bug of Lock On ?
golfsierra2 Posted January 9, 2010 Posted January 9, 2010 (edited) No bug, the AFM for the T-Toad is designed that way. Edited January 9, 2010 by golfsierra2 kind regards, Raven.... [sigpic]http://www.crc-mindreader.de/CRT/images/Birds2011.gif[/sigpic]
Shaman Posted January 9, 2010 Posted January 9, 2010 It has been discussed before. Full answer is somewhere on this forums -> seach. As far I remember correctly, Su-25 fuel or fuel injection system doesn't like negative Gs. Correct me if I am wrong. 51PVO Founding member (DEC2007-) 100KIAP Founding member (DEC2018-) :: Shaman aka [100☭] Shamansky tail# 44 or 444 [sIGPIC][/sIGPIC] 100KIAP Regiment Early Warning & Control officer
Boberro Posted January 9, 2010 Posted January 9, 2010 Yes IIRC it's true. Reminder: Fighter pilots make movies. Bomber pilots make... HISTORY! :D | Also to be remembered: FRENCH TANKS HAVE ONE GEAR FORWARD AND FIVE BACKWARD :D ಠ_ಠ ツ
Lucas_From_Hell Posted January 9, 2010 Posted January 9, 2010 Even jet engines, after a X period upside down, suffer from "starvation" (can't translate it properly, sorry). Don't ask me why, I only know they do :D
GGTharos Posted January 9, 2010 Posted January 9, 2010 Correct. If you fly too long at negative g, fuel flow to the engines is interrupted. There's no bug, and this is the correct modeling of this phenomenon as per the Su-25 manual. I don't know who the heck you spoke with ... a pilot can avoid his engines from shutting down by flying inverted with greater than 0g. [sIGPIC][/sIGPIC] Reminder: SAM = Speed Bump :D I used to play flight sims like you, but then I took a slammer to the knee - Yoda
Renato71 Posted January 10, 2010 Posted January 10, 2010 Not a phenomenon, just a real deal :) There are fuel pumps, but their feeding is gravity dependent - openings are at the bottom of the tanks, or fuel pipes have openings near the bottom of the tanks. On Su-25/25T there is a small tank, so called "negative g tank", that provides fuel (to the fuel pumps) for a limited period of time. Fuel from the underwing or any external tanks is pumped out, but pipes lead to the bottom of the tanks, meaning that it is not possible to pump the fuel out of them if aircraft is under negative G (inverted, flaying on back). Such feature is present on most of the aircraft as it is very hard to design simple "all G" fuel feeding, and in most cases it is not needed anyway. At least over longer periods of time :) I'm selling MiG-21 activation key. Also selling Suncom F-15E Talon HOTAS with MIDI connectors, several sets. Contact via PM.
Spyros Posted January 10, 2010 Posted January 10, 2010 To restart the engines in flight, quickly move the throttle this way: MIN - MAX - MIN and leave it there (at minimum) during the startup. When the engines are running again you can move the throttle. P.S. You must not be inverted during the restart. God forgives... Spyros doesn't.
Majesco Posted January 11, 2010 Author Posted January 11, 2010 Thanks for the confirmation :D To restart the engines in flight, quickly move the throttle this way: MIN - MAX - MIN and leave it there (at minimum) during the startup. When the engines are running again you can move the throttle. P.S. You must not be inverted during the restart. In some cases, engines could not be restarted as your way, i must turn them off, then turn on again
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