Skulleader Posted November 13, 2014 Posted November 13, 2014 Hello, During one ramp start I would like to know if it's normal to start the engine without switch ON the three fuel pumps ? My DCS is 1.2.11. Thanks for your comments, Skull. [sIGPIC]http://forums.eagle.ru/signaturepics/sigpic93192_6.gif[/sIGPIC] My Facebook: https://www.facebook.com/profile.php?id=100006748814655 My P-51D's Mod: http://forums.eagle.ru/showthread.php?t=142739 One of my few skins : https://www.digitalcombatsimulator.com/en/files/1452845/
default762792 Posted November 13, 2014 Posted November 13, 2014 I just checked this out. Yes, it will start without switching the fuel pumps on, and I'm pretty sure before this version, a few times I couldn't start the plane until I figured out that I'd forgotten the pumps during the startup sequence. However, in the current version, once the plane is fully started without switching on the fuel pumps, if you advance the throttle it increases RPM a little and then the engine stops. So the pumps are not necessary for startup, but are for RPM above idle. I assume this is a bug/error, unless there's some system in the engine that provides enough fuel pressure to start but not maintain operating RPM...?
xxJohnxx Posted November 13, 2014 Posted November 13, 2014 This website states that the fuel system uses bleed air, auxiliary pumps and engine driven pumps to pump the fuel to the engine. The engine driven pump sure would explain why you could start and run the engine. The bleed air would help as well, once the engine reached idle RPM. However, the question is, why would the engine stall again, once you increase RPM. Could be because of higher necessary fuel flow, that the engine driven pump and bleed air system can't provide. Could have other reasons as well. Check out my YouTube: xxJohnxx Intel i7 6800k watercooled | ASUS Rampage V Edition 10 | 32 GB RAM | Asus GTX1080 watercooled
Skulleader Posted November 13, 2014 Author Posted November 13, 2014 Hello, Thanks for this explanation and I hope that LN will be give us one solution about this phenomen, bug or not not easy to know. Bye, Skull. [sIGPIC]http://forums.eagle.ru/signaturepics/sigpic93192_6.gif[/sIGPIC] My Facebook: https://www.facebook.com/profile.php?id=100006748814655 My P-51D's Mod: http://forums.eagle.ru/showthread.php?t=142739 One of my few skins : https://www.digitalcombatsimulator.com/en/files/1452845/
default762792 Posted November 13, 2014 Posted November 13, 2014 I messed around with this for a while - the engine will start with no pumps, but for the throttle to be set at higher than idle, at least the drain tank pump must be switched on, and with that switched on you can go to maximum RPM and afterburner, at least for awhile. I've included a (very boring) track showing (I think) that the engine will stop above idle with either or both of the first or third fuel tank group pumps switched on but with the drain tank pump switched off.fuel pumps.trk
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