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

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.
-- Marie Ebner von Eschenbach