awirOn 4 Posted October 1, 2014 Share Posted October 1, 2014 Hey guys, I just opened a new thread to avoid dealing with two problems in one thread. Let's get to the point, It feels like the IAE engines burn unusually more fuel than the CFM ones. Might this be something to be revised or is this another case of an "It's not a bug, it's a feature" ? http://forum.aerosoft.com/index.php?/topic/85965-iae-engines-bugged/?p=616990 Thanks Link to comment Share on other sites More sharing options...
Airbus339 129 Posted October 1, 2014 Share Posted October 1, 2014 Hello, could you please check if we are talking about the same issue? http://forum.aerosoft.com/index.php?/topic/85783-fuel-mismatch/ To me FF is pretty correct, the problem is fuel that disappears. If so devs are working on it, if not please disregard my message Link to comment Share on other sites More sharing options...
awirOn 4 Posted October 1, 2014 Author Share Posted October 1, 2014 Hi, unfortunately it's not the same problem. I was comparing the remaining fuel on board, not the "fuel used". Link to comment Share on other sites More sharing options...
airflyer 7 Posted October 1, 2014 Share Posted October 1, 2014 Yes the IAE engine burns much more fuel than planned. Mostly it needs one ton or more than I have calculated with PFPX. Plus I have the feeling that the CFM engine is a bit underpowered. With an equivalent weight I need way more runway length than with IAE engines. Link to comment Share on other sites More sharing options...
kevinh 6 Posted October 1, 2014 Share Posted October 1, 2014 I find the opposite. I just flew the same route out of Gatwick with CFM and then IAE engined versions. I used the same load for each flight, block fuel 14 tonnes. With the CFM engines the A319 reached top of climb just before Clacton VOR (CLN). Once stabilised in cruise over CLN with fuel remaining at 12.4 tonnes, fuel flow was 1560 kg/hr per engine. With the IAE engines the A319 reached top of climb slightly sooner and using less fuel. Over CLN, fuel remaining was 12.8 tonnes and fuel flow was 1480 kg/hr per engine. Link to comment Share on other sites More sharing options...
awirOn 4 Posted October 5, 2014 Author Share Posted October 5, 2014 Four days and still no answer Link to comment Share on other sites More sharing options...
Airbus339 129 Posted October 5, 2014 Share Posted October 5, 2014 You can try the new Hotfix 1.02 Link to comment Share on other sites More sharing options...
Deputy Sheriffs The Dude 6537 Posted October 5, 2014 Deputy Sheriffs Share Posted October 5, 2014 Four days and still no answer What problem do you have with the fuel flow of the IAE? Could you post some more info like FL, speed, SAT, weight. We modelled the FF with the real charts from Airbus. I am not saying we are right and you are wrong but your statement is held very very general. You need to be a bit more specific here so we can help you. And please do not compare our total Fuel Used with what PFPX says it should. This is not proof that anything is wrong on our side. I have real OFP's that state false tripfuels for real flights with real planes. It is just a bunch of calculations that take old/presumed parameters into the equation. Thank you ps, an aircraft engine is just like a car engine. 1.4 litre 122 BHP burns less than 2.0 litre 200 BHP. Link to comment Share on other sites More sharing options...
awirOn 4 Posted October 5, 2014 Author Share Posted October 5, 2014 According to my observations the IAE engines use remarkably more fuel in contrast with CFM. I wasn't comparing the planned trip fuel of PFPX or real OFPs, but I did compare the behaving of both engines under roughly the same circumstances. EDDH-EDDL - A319 CFM - FL260 - 201 nautical miles 124 pax, 3.91 cargo On blocks - 5000kgs TO - 4880kgs T/C - 3840kgs Cruise - SAT -32°C, GS 382, TAS 426, wind ~244/53kts T/D - 3480kgs Established ILS - 3200kgs Left the runway - 3100kgs On blocks - 3000kgs Half an hour later: EDDL-EDDH - A319 IAE - FL230 - 237nm - Mostly had tailwind 124 pax, 2.62 cargo On blocks - 5400kgs TO - 5240kgs T/C - 4120kgs Cruise level - SAT -25°C, GS444, TAS 408, wind ~256/37kts T/D - 3380kgs ILS - 2600kgs Sadly forgot to note the fuel after vacating the runway on blocks - 2280kgs Link to comment Share on other sites More sharing options...
Deputy Sheriffs The Dude 6537 Posted October 5, 2014 Deputy Sheriffs Share Posted October 5, 2014 Just to be sure, we are talking FOB in your last post? Link to comment Share on other sites More sharing options...
awirOn 4 Posted October 5, 2014 Author Share Posted October 5, 2014 Yup. CFM IAE Link to comment Share on other sites More sharing options...
Deputy Sheriffs The Dude 6537 Posted October 6, 2014 Deputy Sheriffs Share Posted October 6, 2014 I still have to check your figures but we are on it. What you should know is that the CFM will be remodelled so to take this Engine as a base can be misleading at the moment. We also checked all of our FF numbers with RW data collecting and Airbus charts so do not get your hopes up that something is extremely off here. Link to comment Share on other sites More sharing options...
awirOn 4 Posted October 11, 2014 Author Share Posted October 11, 2014 Thanks for your effort Link to comment Share on other sites More sharing options...
awirOn 4 Posted October 25, 2014 Author Share Posted October 25, 2014 How's it going? Link to comment Share on other sites More sharing options...
Joshua Che. 1601 Posted October 25, 2014 Share Posted October 25, 2014 How's it going? What you should know is that the CFM will be remodelled so to take this Engine as a base can be misleading at the moment. Link to comment Share on other sites More sharing options...
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