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Old 16th October 2017, 10:22   #16
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Default Re: An electric airplane? EasyJet wants one!

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Originally Posted by apachelongbow View Post
Current technology electric motors cannot power heavy load users like flaps, slats or landing gears. At best it can work compressors for pressurization and air-conditioning (like the 787). .
True, electrical motors/systems will need to be developed in line with batteries. But electrical system are already replacing hydraulic system. 787 has electrical brakes too.

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Old 16th October 2017, 12:27   #17
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Default Re: An electric airplane? EasyJet wants one!

Some presentations from Saab about the future of hydraulic versus electrical actuator system.

What is also interesting to see is that they are thinking about completely different ways of controlling wings (e.g. morphing)

https://www.slideshare.net/reyyandem...uation-systems

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Old 17th October 2017, 12:04   #18
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Default Re: An electric airplane? EasyJet wants one!

After I posted my previous message on the morphing of the wings, I realised that has been done before!

In fact that is how motorised aviation started. The first powered flight by the Wright brothers December 17th, 1903.

Their plane did not have traditional flight controls as we know them today, but used for instance "wing warping"'.

https://en.wikipedia.org/wiki/Wright_brothers

But the basic idea between wing warping and wing morphing is identical. You change the shape of the wing so it increases lift on one side and decreases lift on the other side.

Obviously, it's a bit easier to bend a wing made out of a wooden frame and some canvas than an alumunium or composite, but still!

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Old 25th October 2017, 20:27   #19
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Default Re: An electric airplane? EasyJet wants one!

There was ongoing research a few years back on beamable electricity. Something on the likes of using microwave radio signals to beam electrical current/voltage to run electric motors, sans cables or batteries. If this technology matures, the possibility of electric aircraft indeed exists since airplanes can recieve electic power over air, like mobile signals, no need to carry heavy power sources.
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Old 26th October 2017, 15:05   #20
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Default Re: An electric airplane? EasyJet wants one!

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Originally Posted by apachelongbow View Post
There was ongoing research a few years back on beamable electricity. Something on the likes of using microwave radio signals to beam electrical current/voltage to run electric motors, sans cables or batteries. If this technology matures, the possibility of electric aircraft indeed exists since airplanes can recieve electic power over air, like mobile signals, no need to carry heavy power sources.
It's quite simple.
2 batteries. One big, the other tiny.

Carry the biggest battery you can. Use it's power to take off and reach cruising altitude. By then it's power would have gotten exhausted.

Simply jettison the heavy battery.

Continue onwards on your tiny battery with your plane now weighing 50% less.

To prevent any injury to anyone on land who gets brained with the battery, fix small wings or a parachute to the battery and send it earthwards like a feather.

I'm keeping a space on my shelf for my Nobel prize.

Even better.

Equip runways with steam powered aircraft launchers. Load the plane, hook it on to the steam launcher and you'll be off like a slingshot.
This will work for regular 777's too.

Okay that's 2 Nobel prizes.

Last edited by hangover : 26th October 2017 at 15:12.
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Old 26th October 2017, 15:24   #21
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Default Re: An electric airplane? EasyJet wants one!

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I'm keeping a space on my shelf for my Nobel prize.

Okay that's 2 Nobel prizes.
Good thinking, dont quit the day job yet though!
You are likely to have to dust an empty shelf for a while

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Old 26th October 2017, 16:26   #22
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Default Re: An electric airplane? EasyJet wants one!

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Originally Posted by hangover View Post
It's quite simple.
2 batteries. One big, the other tiny.
Carry the biggest battery you can. Use it's power to take off and reach cruising altitude. By then it's power would have gotten exhausted.
Simply jettison the heavy battery.
Continue onwards on your tiny battery with your plane now weighing 50% less.
Not so simple. The airplanes need to have margin for diversions, multiple go-arounds due to various reasons etc. One of the biggest issue here is the energy density of currently available battery technology.
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Old 27th October 2017, 11:27   #23
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Default Re: An electric airplane? EasyJet wants one!

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There was ongoing research a few years back on beamable electricity. .
The first time this was thought off goes all the way back to Tesla apparently!

http://www.teslasociety.com/tesla_tower.htm

No idea what the current state of affairs is though.

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