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#41
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"Gord Beaman" wrote in message news "Leadfoot" wrote: For 747-100, -200, -300 yes. For the -400 it was an option many airlines chose. Remember the 747-400 was designed for long-range flight with the winglets, the FMS and the wet tail Speaking of which...anyone any idea of how much this feature actually saves? (wet tail system I mean). The wet tail carried almost the same amount of fuel as a 737. It is simply additional fuel to be sused and generally it is the first tank to empty -Gord. "You are completely focused on RPM as the single factor producing rotational velocity" -Guess who? |
#42
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"Leadfoot" wrote:
"Gord Beaman" wrote in message news "Leadfoot" wrote: For 747-100, -200, -300 yes. For the -400 it was an option many airlines chose. Remember the 747-400 was designed for long-range flight with the winglets, the FMS and the wet tail Speaking of which...anyone any idea of how much this feature actually saves? (wet tail system I mean). The wet tail carried almost the same amount of fuel as a 737. It is simply additional fuel to be sused and generally it is the first tank to empty Oh...you don't use it to increase economy by replacing flying tail trim with fuel weight? -- -Gord. |
#43
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"Gord Beaman" wrote in message ... "Leadfoot" wrote: "Gord Beaman" wrote in message news "Leadfoot" wrote: For 747-100, -200, -300 yes. For the -400 it was an option many airlines chose. Remember the 747-400 was designed for long-range flight with the winglets, the FMS and the wet tail Speaking of which...anyone any idea of how much this feature actually saves? (wet tail system I mean). The wet tail carried almost the same amount of fuel as a 737. It is simply additional fuel to be sused and generally it is the first tank to empty Oh...you don't use it to increase economy by replacing flying tail trim with fuel weight? There is already a half ton of DU located in the tail for weight and balance -- -Gord. |
#44
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"Leadfoot" wrote:
"Gord Beaman" wrote in message .. . "Leadfoot" wrote: "Gord Beaman" wrote in message news "Leadfoot" wrote: For 747-100, -200, -300 yes. For the -400 it was an option many airlines chose. Remember the 747-400 was designed for long-range flight with the winglets, the FMS and the wet tail Speaking of which...anyone any idea of how much this feature actually saves? (wet tail system I mean). The wet tail carried almost the same amount of fuel as a 737. It is simply additional fuel to be sused and generally it is the first tank to empty Oh...you don't use it to increase economy by replacing flying tail trim with fuel weight? There is already a half ton of DU located in the tail for weight and balance I'm not talking about 'static balance', I'm talking about 'dynamic balance'. Some large airliners replace the normal aerodynamic 'nose up trim' of the empennage with fuel weight to increase economy during cruise operation only. This drastically reduces the fore and aft stability of course and makes use of an autopilot mandatory. Are you saying that that system is not used on the these 747's? -- -Gord. |
#45
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"Gord Beaman" wrote in message ... "Leadfoot" wrote: "Gord Beaman" wrote in message .. . "Leadfoot" wrote: "Gord Beaman" wrote in message news "Leadfoot" wrote: For 747-100, -200, -300 yes. For the -400 it was an option many airlines chose. Remember the 747-400 was designed for long-range flight with the winglets, the FMS and the wet tail Speaking of which...anyone any idea of how much this feature actually saves? (wet tail system I mean). The wet tail carried almost the same amount of fuel as a 737. It is simply additional fuel to be sused and generally it is the first tank to empty Oh...you don't use it to increase economy by replacing flying tail trim with fuel weight? There is already a half ton of DU located in the tail for weight and balance I'm not talking about 'static balance', I'm talking about 'dynamic balance'. Some large airliners replace the normal aerodynamic 'nose up trim' of the empennage with fuel weight to increase economy during cruise operation only. This drastically reduces the fore and aft stability of course and makes use of an autopilot mandatory. Are you saying that that system is not used on the these 747's? It's been a long time since I worked on a 747-400. It was explained to me that the fuel in the tail was used first. It may still be that way or they could have changed it since I left Boeing. I'm not a pilot Just an avioncs tech who has left the industry due to a busted knee -- -Gord. |
#46
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"Leadfoot" wrote:
There is already a half ton of DU located in the tail for weight and balance I'm not talking about 'static balance', I'm talking about 'dynamic balance'. Some large airliners replace the normal aerodynamic 'nose up trim' of the empennage with fuel weight to increase economy during cruise operation only. This drastically reduces the fore and aft stability of course and makes use of an autopilot mandatory. Are you saying that that system is not used on the these 747's? It's been a long time since I worked on a 747-400. It was explained to me that the fuel in the tail was used first. It may still be that way or they could have changed it since I left Boeing. I'm not a pilot Just an avioncs tech who has left the industry due to a busted knee Ok 'Leadfoot', thanks for the info...certainly a very nice a/c that you worked. I've always admired them. -- -Gord. |
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