[Milsurplus] PU-18/A ???

[jcoward5452 at aol.com]

Group,
  This discussion seems to be leading more and more toward aircraft 
power supplies.Lets start with primary power.What sort of batteries 
were used in WWII aircraft?I imagine some hard to get to compartment 
with lead acid batteries,the number dependant on what space and lift 
would allow.Could the engine(s) be started off the battery or did one 
have to crank up the big spring? Or were there the shot gun shell 
blanks like you see in the "Flight of the Pheonix"(original)?
 Having never been there or done that I am curious.
  I've read a bit about submarines and almost an entire deck was devoted 
to batteries,albiet low head room!. Where in the airplane where the 
batteries located?My guess would be close to or at the center of 
gravity,but be accessable to ground and flight crew,at least in an 
aircraft with a flight crew.In a fighter I guess all you had were 
circuit breakers ,fuses, swithches and Faith.
 Jay KE6PPF
-----Original Message-----
From: jfor at quik.com
To: arc5 at ix.netcom.com
Cc: jfor at quik.com; Milsurplus at mailman.qth.net
Sent: Sun, 8 Oct 2006 7:50 PM
Subject: Re: [Milsurplus] PU-18/A  ???

>
> ----- Original Message -----
> From: <jfor at quik.com>
> Subject: [Milsurplus] PU-18/A ???
>
>
>> The PU-18/a is a 28 VDC input 'screaming mimi' with an 800 Hz 115 VAC
> output.
>
> Wonder if you could turn the inverter with an external AC motor and
> avoid the screaming?

The name plate said 8000 RPM. I think the thing would scream no matter 
how
it was turned. There was also a fan in the thing as I imagine it gets
pretty hot running at full speed and power. Also, 800 Hz magnetics 
scream
all by themselves.

-John


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