Re: jet powered coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

> Surf on over to this web page and check out the Turbo Jet I'm emulating.
> http://www.gas-turbines-dot-com/
 
> The Idea is to generate electricity with the jet and use it to power the 
> coil.  I'm shooting for 1000 watts. We will see...
	There are a lot easier ways to get 1KW.  Like any

	15A outlet...


> Hear is my question
> I'm designing my own generator that will be able to take the

> huge RPM that the turbo spins at. It red lines at 70,000 RPM

	This is 20 times fater than the usual motor, and implies
	serious strength of material issues.  Also safety issues:
	any failure will throw lots of metal very fast.

> but I don't think the alternator will see more than 50,000 RPM.

	Where do the other 20,000 go?
	OffHand, commercial GT engines (eg a/c) use geardrive
	to get the accessory (alternator, pumps) down to
	more usual rpm.

> So if I'm spinning a magnet surrounded by wire at such great

> speeds, will the AC waveform be a problem? 

	Frequency is a function of number of poles and shaft
	speed.

> I don't expect it will be as slow as 60hz.

	Almost impossible at 50,000 RPM.  IIR:
	Fout == (2(p)(rpm))/60
	where p is the number of poles.  2 being the smallest:
	Fout ==(2*2*50,000)/60 ==200,000/60 == 3,333 Hz

> I'm wondering if it would be a hassle for a spark gap design,

	Be hard to find power transformers at 3,333 Hz.
  	If attempting a sync gap, that will be even harder.
	(ACTUALLY, there is an Interesting approach here:
	Put the gap on the alternator shaft and 'poooof'
	its synchronous....  But I'd try it at 60 Hz, rather
	than 3,333 Hz)

> Or coil operation in general of that mater. 
> What say you?
	At the risk of seeming unfeeling:

		Why do it this way?

 	If attempting this, I'd gear it down to something

	'usual'.

	best
	dwp

...the net of a million lies...
	Vernor Vinge
There are Many Web Sites which Say Many Things.
	-me