Derek 2.0 Posted November 7, 2015 Report Posted November 7, 2015 Science is not the strong suit of most MLW posters, to put things mildly. So it seems........call me a heretic.......a concept easily demonstrated with an outside tap, garden hose, pair of pliers and cheapo pressure gauge from Home Depot
On Guard for Thee Posted November 7, 2015 Report Posted November 7, 2015 Ahh no, the reason there is a pump is to maintain flow, no pump, no flow from the outer tanks.......when said pump is off, the static pressure remains the same. If it drops, there is a leak somewhere in the system. Seriously, this is grade school level science, if fluid mechanics worked as you suggest, nobody could siphon fuel from a gas tank with a hose, coffee makers wouldn't work, nor would drinking straws............or, in an emergency (as described in the Airbus material I cited) the center fuel tank wouldn't feed the engines, absent pumps, from the natural siphon created by the flow of a liquid through the fuel system... And no, yet again, you are taking out of your ass..........the mechanical drawings of an Airbus A320 fuel system: As is clearly shown, the fuel line to the APU is always pressurized to the same degree as the rest of the fuel system, and (as mentioned in the prior source) has an emergency pump at the APU to ensure there will be flow to the APU if there is no tank pump pressure.... It quite clearly isn't pressurized unless the pump is on. But keep talking out your ass as you like to call it.
Derek 2.0 Posted November 7, 2015 Report Posted November 7, 2015 It quite clearly isn't pressurized unless the pump is on. But keep talking out your ass as you like to call it. No, its not clear to you......that the line that supplies the APU is supplied by the two , left inner wing tank pumps, and will be under continual pressure......you need not take my word, as I've supplied both written and illustrated material, from Airbus, to confirm this.........I won't hold my breath in you being able to not only refute me, but Airbus, the maker of the aircraft. Go borrow Mom and Dads garden hose and nozzle, figure out how it works, then get back to me
On Guard for Thee Posted November 7, 2015 Report Posted November 7, 2015 No, its not clear to you......that the line that supplies the APU is supplied by the two , left inner wing tank pumps, and will be under continual pressure......you need not take my word, as I've supplied both written and illustrated material, from Airbus, to confirm this.........I won't hold my breath in you being able to not only refute me, but Airbus, the maker of the aircraft. Go borrow Mom and Dads garden hose and nozzle, figure out how it works, then get back to me Apparently you have trouble understanding technical drawings. Perhaps that's why you still refer to such things in terms of mom and dad's hose. And I'm not going to go anywhere close to the connotation that springs from your reference. Back to the point, very simply, pumps create pressure...no pump no pressure. Now of course you pump up the tires on your car, and the pressure stays in there even when you drive away. But fuel systems are designed differently. Basically because you don't really want residual pressure following you around. I know it's confusing.
Derek 2.0 Posted November 7, 2015 Report Posted November 7, 2015 Apparently you have trouble understanding technical drawings. Perhaps that's why you still refer to such things in terms of mom and dad's hose. And I'm not going to go anywhere close to the connotation that springs from your reference. Back to the point, very simply, pumps create pressure...no pump no pressure. Now of course you pump up the tires on your car, and the pressure stays in there even when you drive away. But fuel systems are designed differently. Basically because you don't really want residual pressure following you around. I know it's confusing. I understand the concept perfectly, as do others (and Airbus), likewise know, from your own words, that you clearly do not..........but humor me, from the above "technical drawing" (its called a mechanical drawing) explain or name the portion of the Airbus A320 fuel system that deals with your "residual pressure". Likewise, despite the Airbus drawing stating otherwise, why you feel the APU isn't supplied, in normal use (as cited from Airbus) by the inner left wing tanks/pumps? Two very simple questions.
On Guard for Thee Posted November 7, 2015 Report Posted November 7, 2015 I understand the concept perfectly, as do others (and Airbus), likewise know, from your own words, that you clearly do not..........but humor me, from the above "technical drawing" (its called a mechanical drawing) explain or name the portion of the Airbus A320 fuel system that deals with your "residual pressure". Likewise, despite the Airbus drawing stating otherwise, why you feel the APU isn't supplied, in normal use (as cited from Airbus) by the inner left wing tanks/pumps? Two very simple questions. Supplied by, whatever...but only when it's switched on. Not required when it's turned off. You seem to fail to comprehend the difference. A fairly simple concept.
Derek 2.0 Posted November 7, 2015 Report Posted November 7, 2015 Supplied by, whatever...but only when it's switched on. Not required when it's turned off. You seem to fail to comprehend the difference. A fairly simple concept. No, I understand the concept very well, you do not. When said pump is turned off, where does said pressure go? Likewise, as prescribed by Airbus, why will fuel still flow from the center tank even if both pumps fail?
On Guard for Thee Posted November 7, 2015 Report Posted November 7, 2015 No, I understand the concept very well, you do not. When said pump is turned off, where does said pressure go? Likewise, as prescribed by Airbus, why will fuel still flow from the center tank even if both pumps fail? The pressure goes from whence it came. Look at it like this: if you push a shopping cart through a grocery store, the cart moves along under pressure supplied by you. When you stop applying pressure to the cart because you want to read a label on a product you are thinking of buying, the cart happily comes to rest. Almost as though you didn't exist. Apply it to what you are talking about and the shopping cart is fuel, and you are the pump.
Derek 2.0 Posted November 7, 2015 Report Posted November 7, 2015 The pressure goes from whence it came. What?
Bonam Posted November 7, 2015 Report Posted November 7, 2015 The pressure goes from whence it came. Look at it like this: if you push a shopping cart through a grocery store, the cart moves along under pressure supplied by you. When you stop applying pressure to the cart because you want to read a label on a product you are thinking of buying, the cart happily comes to rest. Almost as though you didn't exist. Apply it to what you are talking about and the shopping cart is fuel, and you are the pump. The cart stops because of friction. As for the rest... have you heard of Newton's 1st law?
On Guard for Thee Posted November 7, 2015 Report Posted November 7, 2015 The cart stops because of friction. As for the rest... have you heard of Newton's 1st law? The cart does stop because of friction. Now can you explain that to our friend D2?
On Guard for Thee Posted November 7, 2015 Report Posted November 7, 2015 What? It seems you like your little emoticons. Do you actually find them entertaining?
Charles Anthony Posted November 7, 2015 Report Posted November 7, 2015 Guys, Stop abusing the freedom of speech offered to your fellow members by fueling thread drift. This thread is locked. Anybody is free to re-start this topic. If the 2nd thread stays on topic, it will be merged with this thread. If the 2nd thread does not stay on topic, then it will be locked as well. We do not have time for a meeting of the flat earth society. << Où sont mes amis ? Ils sont ici, ils sont ici... >>
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