fitness88 Posted October 10, 2014 Posted October 10, 2014 Does the fuel first empty from the external wing drop tanks evenly>then the center external drop tank>then internal wing tanks evenly>then internal fuselage tanks [4]> then lastly the 2 feed tanks? Is the fuel indicator knob 'tank 1' for the internal fuselage tanks? Left indicator counter for external center tank indicates 4100 lbs., the right indicator indicates 0 lbs. Was there supposed to be 2 center tanks? If the fuel indicator knob is turned to the extreme right [ext ctr], what is the next marking and what's it indicating, it seems to always be '0'? I cannot make it out as it is partially blocked. Thank you.
mvsgas Posted October 10, 2014 Posted October 10, 2014 http://www.f-15e.info/joomla/en/technology/fuel-system 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..
GGTharos Posted October 10, 2014 Posted October 10, 2014 1. Yes, but the feed tanks are always draining (feeding engines directly), they're just being fed from the internal tanks which are being fed from ... you get the idea. 2. Yes, it's the indicator for tank 1 :) 3. No, but there are two display windows ... 4. Conformal fuel tanks. Edit: Sniped by the man. [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
fitness88 Posted October 10, 2014 Author Posted October 10, 2014 1. Yes, but the feed tanks are always draining (feeding engines directly), they're just being fed from the internal tanks which are being fed from ... you get the idea. 2. Yes, it's the indicator for tank 1 :) 3. No, but there are two display windows ... 4. Conformal fuel tanks. Do we have these to use? Edit: Sniped by the man. Thank you for the explanation.
fitness88 Posted October 10, 2014 Author Posted October 10, 2014 http://www.f-15e.info/joomla/en/technology/fuel-system Great info! Thank you.
TAW_Blaze Posted October 10, 2014 Posted October 10, 2014 Does the fuel first empty from the external wing drop tanks evenly>then the center external drop tank>then internal wing tanks evenly>then internal fuselage tanks [4]> then lastly the 2 feed tanks? I'm not convinced about that. When the PFM came out it drained simultaneously from all external tanks and there was a thread where some ED people asked if we have proof for what you're saying. Haven't tried it since then but it wasn't mentioned in any patch so I guess it hasn't changed.
GGTharos Posted October 10, 2014 Posted October 10, 2014 Hi, you're welcome, and, no, no CFTs in the game. They're not really used in RL either. The only time I've heard of eagles operationally using them was the Icelandic-based ones. Thank you for the explanation. [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
TAW_Blaze Posted October 10, 2014 Posted October 10, 2014 Just checked it, all externals are being drained simultaneously still.
fitness88 Posted October 10, 2014 Author Posted October 10, 2014 Just checked it' date=' all externals are being drained simultaneously still.[/quote'] This is interesting, as I was flying last night I also noticed simultaneous drop in fuel as I was switching the Indicated fuel selector knob. I can't remember which tanks I was observing so I will check it out later. But reading the article mvsgas posted helped to clarify, see below. Here is an interesting article: source link: http://www.f-15e.info/joomla/en/technology/fuel-system/90-internal-fuel-system During normal operation 200 pounds of tank 1 fuel is transferred before the internal wing tanks start transferring. This is called " CG kick" and the goal of this procedure is to place the aircraft's center of gravity a bit more aft. Once transfer from wing tanks kicked in, all three transfer pumps operate simultaneously during either flight or ground operations. Although tank 1 fuel capacity is higher than the capacity of any of the wing tanks, the pumps' fuel transfer rate is set such a way, that tank 1 and the wing tanks empty within 200 pounds of each other.
mvsgas Posted October 10, 2014 Posted October 10, 2014 Just checked it' date=' all externals are being drained simultaneously still.[/quote'] http://www.f-15e.info/joomla/en/technology/fuel-system/92-external-fuel-tanks If engine consumption exceeds transfer capacity, then all internal and external tanks transfer simultaneously. 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..
blkspade Posted October 10, 2014 Posted October 10, 2014 http://www.f-15e.info/joomla/en/technology/fuel-system/92-external-fuel-tanks Yeah, the problem is there is apparently no point at which they aren't flowing at the same time. http://104thphoenix.com/
fitness88 Posted October 10, 2014 Author Posted October 10, 2014 Yeah, the problem is there is apparently no point at which they aren't flowing at the same time. Yes it would seem so. Once one tank gets low you know the others aren't far behind.
mvsgas Posted October 11, 2014 Posted October 11, 2014 Yeah, the problem is there is apparently no point at which they aren't flowing at the same time. Ok, so to duplicate it, How are you testing this? Could I fly around without burners and all tanks would drain at the same time? If this is correct I can try it see if I get the same results. 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..
mvsgas Posted October 11, 2014 Posted October 11, 2014 I don't normally fly the F-15 so I don't know if this has been reported or not. I tried flying with 3 external tanks and notice the following: - External tanks only feed with LG handle up, AFAIK as it should - External wing tanks are ahead of the "centerline" tank by 100lbs (I am not sure if this is accurate or not. The little I know of the F-15 systems it only states that external wings will feed first, but not sure to what degree.) With that said, is the F-15 (Module or as part FC3) suppose to be that detailed? After all, is not a DCS module (e.i. A-10C, KA-50, etc.) I thought DCS are more complete/detailed and FC3 modules only offer some details. I mean, there a lot of other things that are not accurate neither ( oil pressure, some switches position, etc.) 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..
Python Posted October 11, 2014 Posted October 11, 2014 With that said, is the F-15 (Module or as part FC3) suppose to be that detailed? After all, is not a DCS module (e.i. A-10C, KA-50, etc.) I thought DCS are more complete/detailed and FC3 modules only offer some details. I mean, there a lot of other things that are not accurate neither ( oil pressure, some switches position, etc.) The F-15c has been given lots of love and attention from ED, It is well on its way to becoming a full DCS module... give it time. [sIGPIC][/sIGPIC]
Rainmaker Posted October 11, 2014 Posted October 11, 2014 LOL... Love to help but....what's the question?
wingshigh.g Posted October 12, 2014 Posted October 12, 2014 Fitness88, you mentioned you switched indicated fuel selector knob, could you tell me how to do it? I had thought none of the switches or knobs is selectable? Thanks.
mvsgas Posted October 12, 2014 Posted October 12, 2014 Fitness88, you mentioned you switched indicated fuel selector knob, could you tell me how to do it? I had thought none of the switches or knobs is selectable? Thanks. Left Shift and D should move the fuel indicator. LOL... Love to help but....what's the question? Rain, The OP was answer, blkspade was asking about the external tanks, they way the feed. In the F-15, do the external wing tank feed all the way before the centerline does? Right now the F-15 external tank feed 100lbs before the centerline does, but besides that they feed almout at the same time. 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..
fitness88 Posted October 12, 2014 Author Posted October 12, 2014 I don't normally fly the F-15 so I don't know if this has been reported or not. I tried flying with 3 external tanks and notice the following: - External tanks only feed with LG handle up, AFAIK as it should While air refueling, if FUEL LOW light is off, and when gear is down, fuel won't transfer into internal tanks - External wing tanks are ahead of the "centerline" tank by 100lbs (I am not sure if this is accurate or not. The little I know of the F-15 systems it only states that external wings will feed first, but not sure to what degree.) With that said, is the F-15 (Module or as part FC3) suppose to be that detailed? After all, is not a DCS module (e.i. A-10C, KA-50, etc.) I thought DCS are more complete/detailed and FC3 modules only offer some details. I mean, there a lot of other things that are not accurate neither ( oil pressure, some switches position, etc.) .
Rainmaker Posted October 12, 2014 Posted October 12, 2014 Short answer is no. All external bags will pressurize and attempt to transfer at the same time. The gray area is that there is nothing that says when the bags will go empty or in what sequence. The wing bags will normally start to transfer first and may/may not empty first. The only real limits are with imbalance rates between left/right bags, CFTs if applicable, and the internal wings. If the sim has the wing bags start transferring first, followed by the centerline, that is aboutt the norm and how it should be. But no, the wing bags do not have to go dry before the centerline, but will probably transfer at at little faster rate and finish first.
mvsgas Posted October 12, 2014 Posted October 12, 2014 (edited) So. no problems on fuel transfer nor fuel indication in the F-15C within DCS/FC3, thanks Rain. Fitness88, I don't get you last post. I see you quoting information from the F-15E.info. I was aware of the information. Could you please elaborate? Edited October 12, 2014 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..
Rainmaker Posted October 12, 2014 Posted October 12, 2014 Not to my knowledge...but I have never really examined it. Everything, as expected is basically designed to transfer out from out to in. Tank 1, and of course the feed tanks, are going to be the last ones dry.
fitness88 Posted October 12, 2014 Author Posted October 12, 2014 So. no problems on fuel transfer nor fuel indication in the F-15C within DCS/FC3, thanks Rain. Fitness88, I don't get you last post. I see you quoting information from the F-15E.info. I was aware of the information. Could you please elaborate? Thought you were questioning not making a statement so I was just confirming what you wrote.
fitness88 Posted October 12, 2014 Author Posted October 12, 2014 Not to my knowledge...but I have never really examined it. Everything, as expected is basically designed to transfer out from out to in. Tank 1, and of course the feed tanks, are going to be the last ones dry. I thought the fuel emptied completely from the int. wings first then the fuselage tanks emptied but it seems they empty some what at the same rate. As quoted below: Although tank 1 fuel capacity is higher than the capacity of any of the wing tanks, the pumps' fuel transfer rate is set such a way, that tank 1 and the wing tanks empty within 200 pounds of each other.
Rainmaker Posted October 12, 2014 Posted October 12, 2014 I thought the fuel emptied completely from the int. wings first then the fuselage tanks emptied but it seems they empty some what at the same rate. As quoted below: Although tank 1 fuel capacity is higher than the capacity of any of the wing tanks, the pumps' fuel transfer rate is set such a way, that tank 1 and the wing tanks empty within 200 pounds of each other. That is a good book answer, but as far as real life, the wings are usually dry before tank 1 is.
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