Larry Jaques wrote:
On Wed, 6 Jul 2011 03:00:05 +0000 (UTC), David Lesher

GeoLane at PTD dot NET GeoLane at PTD dot NET writes:

Why do they use 400 Hz for anything?

400 Hz reduces the iron needed in magnetics such as generators,
motors and transformers. Weight is a big big factor in aircraft.

Excellent. I learned my "something new every day" early today.
Thanks. I'd wondered why they used that frequency in airplanes.

Fear not those who argue but those who dodge.

Usually, the newbies' next question concerns that box of dirt in
the tail section for all the equipments' earth ground leads. ;-)

Cheers!
Rich