Vinny002 Posted November 9, 2014 Share Posted November 9, 2014 (edited) Hi, guys! I think I found another bug. It seems like I can start the engine with the 3 boost pumps off. Please see attached. Thanks! Cheers, Vincent Edited March 12, 2015 by Cobra847 Link to comment Share on other sites More sharing options...
Buzzles Posted November 9, 2014 Share Posted November 9, 2014 Is this in a fresh aircraft or one you've landed and refuelled? Fancy trying Star Citizen? Click here! Link to comment Share on other sites More sharing options...
iFoxRomeo Posted November 9, 2014 Share Posted November 9, 2014 Well Vinny, try to takeoff in this configuration.... I have no technical data of the fuel system, but I guess the engine has its own fuel pump. This fuel pump is sufficient for start up, but does not provide enough fuel for high power settings. Fox p.s. Vinny you can use the "print (screen)" button for screenshots. Spoiler PC Specs: Ryzen 9 5900X, 3080ti, 64GB RAM, Oculus Quest 3 Link to comment Share on other sites More sharing options...
Vinny002 Posted November 9, 2014 Author Share Posted November 9, 2014 Hi, Buzzles! This is a fresh aircraft. @iFoxRomeo: I prefer using the iPad to take pictures because it is easier. Cheers, Vincent Link to comment Share on other sites More sharing options...
Mode Posted November 17, 2014 Share Posted November 17, 2014 Well Vinny, try to takeoff in this configuration.... I have no technical data of the fuel system, but I guess the engine has its own fuel pump. This fuel pump is sufficient for start up, but does not provide enough fuel for high power settings. Fox Definitely a bug. No fuel from a dispenser fuel tank so no fuel for an engine. If the dispenser fuel tank pump doesn't work an engine hasn't fuel. I never heard about a special engine pump in the MiG. Link to comment Share on other sites More sharing options...
xxJohnxx Posted November 17, 2014 Share Posted November 17, 2014 The engine has it's own mechanically driven pump that should be able to get fuel from the dispenser tank to the engine. However, getting to fuel to dispenser tank might be a bigger problem. There is a presurization system that uses bleedair to press the fuel out of the tanks, but it is usually operated together with the fuel pumps, so I am not sure if it the pressurization system is sufficient to bring enough fuel to the engine. Check out my YouTube: xxJohnxx Intel i7 6800k watercooled | ASUS Rampage V Edition 10 | 32 GB RAM | Asus GTX1080 watercooled Link to comment Share on other sites More sharing options...
iFoxRomeo Posted November 17, 2014 Share Posted November 17, 2014 Definitely a bug. No fuel from a dispenser fuel tank so no fuel for an engine. If the dispenser fuel tank pump doesn't work an engine hasn't fuel. I never heard about a special engine pump in the MiG. Well, you haven´t heared of a engine driven fuel pump, but I did. http://www.topedge.com/panels/aircraft/sites/kraft/fuel.htm That doesn´t mean this is a 100% trustworthy source, but it looks reasonable. Check the DCS MiG-21 Manual. It describes the emergency procedure for drop of fuel pressure on page 169. It is the same in the RL Manual on page 186 para. 315. And when the DC-generator fails, the procedure says something about the fuel boost system as well. DCS manual p.171, RL manual p.195 When you accelerate the engine to more than 95%N1 without the drain tank fuel pump on, the engine will flame out. But up to 95%N1 it will run. And this fits to the aforementioned emergency procedures No, I don´t consider this as a bug, but a feature. Fox Spoiler PC Specs: Ryzen 9 5900X, 3080ti, 64GB RAM, Oculus Quest 3 Link to comment Share on other sites More sharing options...
Mode Posted November 18, 2014 Share Posted November 18, 2014 Well, you haven´t heared of a engine driven fuel pump, but I did. http://www.topedge.com/panels/aircraft/sites/kraft/fuel.htm That doesn´t mean this is a 100% trustworthy source, but it looks reasonable. Check the DCS MiG-21 Manual. It describes the emergency procedure for drop of fuel pressure on page 169. It is the same in the RL Manual on page 186 para. 315. Оk, I understood which thing you were talking about. And when the DC-generator fails, the procedure says something about the fuel boost system as well. DCS manual p.171, RL manual p.195 When you accelerate the engine to more than 95%N1 without the drain tank fuel pump on, the engine will flame out. But up to 95%N1 it will run. And this fits to the aforementioned emergency procedures Yes, I know that and that is logical. Nevertheless, I think it's a bug. Link to comment Share on other sites More sharing options...
xxJohnxx Posted November 18, 2014 Share Posted November 18, 2014 Nevertheless, I think it's a bug. No Check out my YouTube: xxJohnxx Intel i7 6800k watercooled | ASUS Rampage V Edition 10 | 32 GB RAM | Asus GTX1080 watercooled Link to comment Share on other sites More sharing options...
iFoxRomeo Posted November 18, 2014 Share Posted November 18, 2014 ... Nevertheless, I think it's a bug. Why that? Fox Spoiler PC Specs: Ryzen 9 5900X, 3080ti, 64GB RAM, Oculus Quest 3 Link to comment Share on other sites More sharing options...
Mode Posted November 19, 2014 Share Posted November 19, 2014 Why that? Fox Well, I was talking with a man who seemed to know it quite good. He said it's impossible while the fuel system has gas blocks, need to use fuel booster pumps. Then you can fly without them (with limitations). Link to comment Share on other sites More sharing options...
iFoxRomeo Posted November 25, 2014 Share Posted November 25, 2014 Well, I was talking with a man who seemed to know it quite good. He said it's impossible while the fuel system has gas blocks, need to use fuel booster pumps. Then you can fly without them (with limitations). Sorry, but "talking with a man who seemed to know it quite good" is not such a good source. Maybe Novak can clear this. Fox Spoiler PC Specs: Ryzen 9 5900X, 3080ti, 64GB RAM, Oculus Quest 3 Link to comment Share on other sites More sharing options...
Mode Posted January 14, 2015 Share Posted January 14, 2015 Sorry, but "talking with a man who seemed to know it quite good" is not such a good source. Maybe Novak can clear this. Fox Yes, but you haven't one too. He can, I'm sure. Link to comment Share on other sites More sharing options...
xxJohnxx Posted January 14, 2015 Share Posted January 14, 2015 Here, check out this link: http://www.topedge.com/panels/aircraft/sites/kraft/fuel.htm Afterburner-use with Main Pump in Off position can cause engine failure. Suggesting that the engine can be used without the main pumps, just not in afterburner. Check out my YouTube: xxJohnxx Intel i7 6800k watercooled | ASUS Rampage V Edition 10 | 32 GB RAM | Asus GTX1080 watercooled Link to comment Share on other sites More sharing options...
Mode Posted January 14, 2015 Share Posted January 14, 2015 (edited) Here, check out this link: http://www.topedge.com/panels/aircraft/sites/kraft/fuel.htm Suggesting that the engine can be used without the main pumps, just not in afterburner. Ok, but the question is can the engine start up without activated fuel pumps. It's really interesting to me now. Added. I mean fuel boost pumps of 1st and 3rd fuel tanks groups. Upgrade. In the Russian side we were talking about starting engine up with fuel boost pumps disengaged and have agreed that it's possible to start up without those pumps. So, you guys "won". Edited January 15, 2015 by Mode Link to comment Share on other sites More sharing options...
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