Rich wrote:
> For years, accepted aeronautical engineering theory said a bumble bee
> can't fly. The perplexing thing about bent filament helices in 3-500Zs
> is that theoretically, the cathode doesn't have enough peak emission to
> melt #28 Cu.
>
"Accepted aeronautical engineering" never said this. It has been passed
around sufficiently so as to become an "urban legend."
See:
http://www.sciencenews.org/sn_arc97/3_29_97/mathland.htm and
http://www.asa3.org/archive/evolution/199602/0059.html
for some debunking of this oft (mis)repeated story.
73,
Doug, K4DSP
|