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Old August 17th 05, 08:27 AM
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It's probably some kind of ultra high voltage DC pancake motor that
would require it's own special APU to power it. It would have to
develope on the order of three to four hundred horsepower to be able to
reliably move a fully loaded jet around under all the taxi conditions
that a jet might see. In addition it would either have to be able to
spool up at a fast enough rate as to not rip the nose gear tires off
the rims on landing or be disconnected from the nose wheels on landing.
Either way it's a lot of extra crap to carry around on the aircraft as
well as go through the certification process over using a tug.

Craig C.