why they use generally electricity of 115 volt with 400Hertz oscillation in commercial aircrafts ?!
2006-10-19 08:27:14 · 8 answers · asked by E.A.O 2 in Cars & Transportation ➔ Aircraft
A higher frequency allows for lighter components and wires. Capacitive reactance decreases with frequency increase and inductive reactance increases. So inductors (which are iron, which is heavy) can be made lighter and produce the same effective resistance and capacitors can have a less conductive dielectric.
Its not for less electrical noise, you can hear that 400Hz hum over the comm every time.
2006-10-19 08:52:44 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The average man can pick up and carry a 40 HP 115/208v 3 phase 400 Hz electric motor. At 60 Hz, you need a forklift.
2006-10-19 10:03:47 · answer #2 · answered by Bostonian In MO 7 · 2⤊ 0⤋
That is the nessasary AC power output to keep all the systems in the Aircraft running. It just was the way they made the planes. It also is the amount of pwer need to restart the engines if they stop, as in engine failure or stopped at a airline gate for boarding. All aircraft have back up generators to ensure that the engines can be restarted.
2006-10-19 15:26:03 · answer #3 · answered by fly4fun 1 · 0⤊ 1⤋
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Higher than usual frequencies, such as 400 Hz, offer several advantages over 60 Hz – notably in allowing smaller, lighter power supplies to be used for military hardware, commercial aircraft operations and computer applications. As aircraft space is at a premium and weight is critical to aircraft engine thrust and fuel burn (and thus the aircraft range and engine horsepower per pound), 115 volts at 400 Hz offers a distinct advantage and is much better than the usual 60 Hz used in utility power generation.
2016-04-10 23:27:08 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Contrary to what was written above, turbofan engines are not started with electric motors. They use bleed air from the APU (Aux Power Unit) to start the engne turning.
As soon as one engine is running, that larger generator is brought online. That's why the lights flash once one of the engines is up and running, they just switched the power over.
And the reason it's 400Hz is size, as stated above.
2006-10-19 17:42:59 · answer #5 · answered by Anonymous · 1⤊ 1⤋
115v 400hz
2016-12-14 14:30:56 · answer #6 · answered by mastro 4 · 0⤊ 0⤋
That's the type voltage/frequency needed for several of the gyro instruments, among other things.
2006-10-19 08:39:19 · answer #7 · answered by Steve 7 · 0⤊ 1⤋
less interference with communications :)
2006-10-19 08:38:31 · answer #8 · answered by Anonymous · 0⤊ 3⤋