WildBillKelsoe Posted March 7, 2015 Share Posted March 7, 2015 (edited) Probably asked before, but what is the importance of ground power if you need APU to start engines? And what do momentary motor / ignition switches do? Edited March 7, 2015 by WildBillKelsoe AWAITING ED NEW DAMAGE MODEL IMPLEMENTATION FOR WW2 BIRDS Fat T is above, thin T is below. Long T is faster, Short T is slower. Open triangle is AWACS, closed triangle is your own sensors. Double dash is friendly, Single dash is enemy. Circle is friendly. Strobe is jammer. Strobe to dash is under 35 km. HDD is 7 times range key. Radar to 160 km, IRST to 10 km. Stay low, but never slow. Link to comment Share on other sites More sharing options...
_Randolph93 Posted March 7, 2015 Share Posted March 7, 2015 Probably asked before, but what is the importance of ground power if you need APU to start engines? And what do momentary motor / ignition switches do? You need the APU running because engines are started with bleed air from it. The switches you mentioned are for in-flight engine restart for upper (IGN)position and downward(motor) is used to remove fuel from engine after failed start to prevent engine overheat when restarting the engine.Middle position is for normal operation. Intel i5-9600k - Asus TUF Z390 - 32GB DDR4 corsair - Gigabyte RTX 2070 - Seasonic 620W - SSD Crucial, HDD Seagate Link to comment Share on other sites More sharing options...
Luzifer Posted March 7, 2015 Share Posted March 7, 2015 Ground power gives you electricity only. To turn the engines pressurized air is used, that's what the APU delivers. The motor switch allows you to turn the engines without doing the startup, i.e. without ignition and fuel injection. The ignition switch is for in-flight windmill restarts (force ignition on when sufficient RPM is reached). Link to comment Share on other sites More sharing options...
mvsgas Posted March 8, 2015 Share Posted March 8, 2015 Just to add to what _Randolph93 and Luzifer posted, you do not need ground power to start the A-10. Additionally, in RL, maintenance crews may use ground power to perform certain operational checks and other maintenance. To whom it may concern, I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that. Thank you for you patience. Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true.. Link to comment Share on other sites More sharing options...
StrongHarm Posted March 8, 2015 Share Posted March 8, 2015 In RL you have a huffer you can use to start the engines.. it's basically an APU on wheels to save the service life of the aircraft APU. We used to put small critters we'd find in liquid oxygen, then throw them in the exhaust on the top of the huffer. The over oxygenated frozen critter would become a very bright ball of flame flying far up into the air.. that would hopefully burn out before it came back down. Question: Is it possible to do a cross bleed start from engine 1 to engine 2? Does anyone have a procedure? It's a good thing that this is Early Access and we've all volunteered to help test and enhance this work in progress... despite the frustrations inherent in the task with even the simplest of software... otherwise people might not understand that this incredibly complex unfinished module is unfinished. /light-hearted sarcasm Link to comment Share on other sites More sharing options...
mvsgas Posted March 8, 2015 Share Posted March 8, 2015 (edited) Again, I do not think A-10 need the ground bleed air nether to start. On the cross bleed start, I have not done it for a while but it was possible in the past Edit: I just tried and yes, you can start either engine with the other without the APU being on. Edited March 8, 2015 by mvsgas To whom it may concern, I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that. Thank you for you patience. Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true.. Link to comment Share on other sites More sharing options...
baltic_dragon Posted March 8, 2015 Share Posted March 8, 2015 Probably asked before, but what is the importance of ground power if you need APU to start engines? And what do momentary motor / ignition switches do? As stated above, you need APU to start the engines. The thing I found ground power useful for were repairs on the ground - since you have to turn off your engines for that, it is good to connect ground power not to have to do the nav realignment etc. Link to comment Share on other sites More sharing options...
Snoopy Posted March 8, 2015 Share Posted March 8, 2015 As stated above, you need APU to start the engines. The thing I found ground power useful for were repairs on the ground - since you have to turn off your engines for that, it is good to connect ground power not to have to do the nav realignment etc. You don't have to do that either. Real world ops we shut #1 down first. Once the fuel details we start the APU then shot down #2. As said above we don't use external power and air to start up. Normal ops is if the APU won't start we ground abort that aircraft and step to a spare. I'm sure it's been done occasionally but in 20 years I have never seen an A-10 stared with a -60 and hobart. v303d Fighter Group Discord | Virtual 303d Fighter Group Website | v303rd Fighter Group Twitter Link to comment Share on other sites More sharing options...
WildBillKelsoe Posted March 8, 2015 Author Share Posted March 8, 2015 Thanks guys AWAITING ED NEW DAMAGE MODEL IMPLEMENTATION FOR WW2 BIRDS Fat T is above, thin T is below. Long T is faster, Short T is slower. Open triangle is AWACS, closed triangle is your own sensors. Double dash is friendly, Single dash is enemy. Circle is friendly. Strobe is jammer. Strobe to dash is under 35 km. HDD is 7 times range key. Radar to 160 km, IRST to 10 km. Stay low, but never slow. Link to comment Share on other sites More sharing options...
StrongHarm Posted March 9, 2015 Share Posted March 9, 2015 Good info Snoopy, thanks! We often used a huffer in the Navy for engine start.. maybe AF has better APUs :) mvsgas, is there a crossbleed switch, or can you just; APU start > Engine1 > APU shutdown > Engine2(auto crossbleed from Engine1)? It's a good thing that this is Early Access and we've all volunteered to help test and enhance this work in progress... despite the frustrations inherent in the task with even the simplest of software... otherwise people might not understand that this incredibly complex unfinished module is unfinished. /light-hearted sarcasm Link to comment Share on other sites More sharing options...
StrongHarm Posted March 17, 2015 Share Posted March 17, 2015 mvsgas, could you elaborate on how you did a cross bleed start of engine2 off of engine1 instead of the APU? Didn't work for me. It's a good thing that this is Early Access and we've all volunteered to help test and enhance this work in progress... despite the frustrations inherent in the task with even the simplest of software... otherwise people might not understand that this incredibly complex unfinished module is unfinished. /light-hearted sarcasm Link to comment Share on other sites More sharing options...
Snoopy Posted March 18, 2015 Share Posted March 18, 2015 (edited) Good info Snoopy, thanks! We often used a huffer in the Navy for engine start.. maybe AF has better APUs :) mvsgas, is there a crossbleed switch, or can you just; APU start > Engine1 > APU shutdown > Engine2(auto crossbleed from Engine1)? mvsgas, could you elaborate on how you did a cross bleed start of engine2 off of engine1 instead of the APU? Didn't work for me. Run up the good engine to 85% and place the other engine's throttle over the hump. Edited March 18, 2015 by Snoopy v303d Fighter Group Discord | Virtual 303d Fighter Group Website | v303rd Fighter Group Twitter Link to comment Share on other sites More sharing options...
StrongHarm Posted March 18, 2015 Share Posted March 18, 2015 Thanks Snoopy, that explains it.. I tried to motor the engine up then ignite instead of just pushing the hump. It's a good thing that this is Early Access and we've all volunteered to help test and enhance this work in progress... despite the frustrations inherent in the task with even the simplest of software... otherwise people might not understand that this incredibly complex unfinished module is unfinished. /light-hearted sarcasm Link to comment Share on other sites More sharing options...
Snoopy Posted March 18, 2015 Share Posted March 18, 2015 Thanks Snoopy, that explains it.. I tried to motor the engine up then ignite instead of just pushing the hump. You can motor first, just make sure the good engine is at 85% first. v303d Fighter Group Discord | Virtual 303d Fighter Group Website | v303rd Fighter Group Twitter Link to comment Share on other sites More sharing options...
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