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#21
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Just another tit on the aircraft's Jet-A tanks.
Jim "Bucky" wrote in message oups.com... wrote: It's probably some kind of ultra high voltage DC pancake motor that would require it's own special APU to power it. What powers an APU? diesel fuel or something? |
#22
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"N93332" wrote in message ... "sfb" wrote in message news:NcHMe.7384$rR4.2590@trnddc08... Where will you find the BTUs to charge the tugs? Isn't the theory that the plane has free amps to spare either from an APU that must be running anyway or batteries charged off the main engines while flying much like free heat to warm your automobile. "N93332" wrote in message ... Just brainstorming so this may be a completely wrong idea. Ok, some way to electrically connect the tug to the jet to use the jet's 'free' amps? Charge the tug while it is tugging? Or the other way around; power the plane from the tug until engine start... |
#23
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wrote What they are going to find in the end, is that putting some kind of electric taxi system on the individual aircraft is going to backfire and cost them seat and cargo capacity that outweighs the supposed saved fuel costs. I suspect that the electric taxi concept is to be used in precision taxi movements, and pushbacks, to avoid jet blast issues. I don't think that they would plan on doing long distance and/or higher speed taxi movements. Smaller motors with much gearing could mean a pretty small unit, and wires. It would mean that they could delay engine start, and also shut down earlier. The APU will already be running anyway, right? Unless someone knows more than has been mentioned here, all we are doing is speculating on the configuration, and use. What results is bound to be a WAG. The whole idea of Boeing's new generation of planes, is to use the jet engines for propulsion; only, and eliminate bleed air being used for a bazillion other uses, thus stealing thrust and efficiency. It makes great sense to me. It boggles my mind to see how much bleed air is used to run an air cycle machines. -- Jim in NC |
#24
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"Bucky" wrote What powers an APU? diesel fuel or something? It is just a small jet engine, running a shaft for auxiliary power use, and power generation. I can't imagine why an additional dedicated APU would be necessary for the electric taxi motor. -- Jim in NC |
#25
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Morgans wrote: "Bucky" wrote What powers an APU? diesel fuel or something? It is just a small jet engine, running a shaft for auxiliary power use, and power generation. I can't imagine why an additional dedicated APU would be necessary for the electric taxi motor. -- Jim in NC Most APU's are already loaded up to nearly their max output. I have yet to be on a jet with an APU that provide enough electrical power for everything on the aircraft as well as enough air for the air conditioner packs. |
#26
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"Larry Dighera" wrote in message
... BOEING CO. has tested an electric motor that could allow commercial jets to taxi around airports without using their engines or ground-based towing vehicles, the company said. SNIP Kinda OT, but IIRC, the XB-70 Valkerye (sp?) had electric motors that "spun up" the mains just before touchdown so that they didn't shear the tires off the wheels upon landing. I don't think these motors helped it taxi however. Jay Beckman - PP/ASEL Arizona Cloudbusters Chandler, AZ |
#27
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#28
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#29
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And those of us on usenet seeing a possible breakthrough in engineering
technology saying, "why the hell did I spend all that time in engineering school when these uninformed idiots comparing 1950s technology on usenet have all the answers". Jim "alexy" wrote in message ... wrote: Silly Boeing, paying all those engineers, when the answer is freely available on Usenet. ;-) |
#30
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Well, if you went to school in the 50's, that was the current technology
then, so that is what you were taught. Some might say, old habits die hard! RST Engineering wrote: And those of us on usenet seeing a possible breakthrough in engineering technology saying, "why the hell did I spend all that time in engineering school when these uninformed idiots comparing 1950s technology on usenet have all the answers". wrote: Silly Boeing, paying all those engineers, when the answer is freely available on Usenet. ;-) |
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