"Marconi radio-comm. and D/F equipment installed in the Comet".
 

On 09/24/2010 04:36 PM, Brenda Ann wrote:


"philo" wrote in message
...
On 09/17/2010 02:17 PM, _JD_ wrote:
Found this magazine photo on the net and just sharing




How did the plane get off the ground with all that :)

Most of the equipment made for aircraft at the time ran on 400 Hz, and
was significantly lighter than it's earthbound counterparts.




Yep

when I was in HS we sometimes bought military surplus gear
and knew we could not use those 400hz xfmrs.

In the business I am in...
some of our power transformers run at approx 15khz

I can hold one in my hand...
the 60hz equivalent can weight several hundred pounds!