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!