Subtitles section Play video Print subtitles This is the world's first full sized all electric passenger plane. Her name is Alice. Now she isn't the first attempt at an electric passenger plane. Previous attempts looked like this. A glider or naled seaplane retrofitted with an electric engine. But Alice is different. The aviation Alice is a nine passenger to crew, all electric commuter aircraft. This aircraft is built from the ground up to be electric. It's not a conversion of anything. Israeli Aeronautics Company Aviation started work on Alice back in 2015 and debuted the plane in June 2019. Its goal. To find a sustainable way to move people regionally. Air travel is one of the fastest growing contributors to climate change and even mid pandemic. When travel has dipped the airline industries, carbon footprint is still outpacing predictions. Regional travel is a big component of that footprint. In 2017 half of the four billion air tickets sold were for regional flights, even though these were short distances, the aircraft used were huge jet planes built across oceans. That's an insanity because we're using the wrong tools for the job. Alice might be a solution for these popular commuter routes. Think New York city to D. C, or even up the West Coast between San Jose and San Diego. The plane is built to fly up to 650 miles on just one charge of its lithium ion battery the distance from London to Prague. And it's designed to carry passengers at cruising speeds of about 276 MPH. Now that's about half assed fast as Jet Field planes. So a one hour, 10 minute flight from New York City D. C. Would be about 2.5 hours on Alice. But Alice could do that. Journey emissions free It seems ideal, but engineers faced a few challenges. While building Alice, it has a huge battery. We have roughly 3.6 metric tons of battery over £8000 in electric cars. A batteries wait isn't as much of an issue because cars stay on the ground. But in a plane trying to get in the air with a heavy battery becomes a challenge. The bigger the battery, the more power for the plane. But a bigger battery also means more weight toe lift, so more power is needed to get it in the air in normal airplanes. An estimated 30% of the plane's maximum take off weight is jet fuel, and that weight lessens over time as jet fuel is burned while in the air. But for Alice were roughly at 60% of maximum take off weight, meaning 60% off the plane. When it takes off is better. It's the same when it lands. We don't lose anything. So aviation had two solutions for a heavy battery. Engineers distributed the battery throughout the plane that batteries literally all over the place. It's under the floor. It's in the wings, in the fuselage, in different locations. Then they balanced out the batteries. Sheer weight. The way to do it is just to build everything else very light. Alice has a lightweight airframe, slim wings and wing tip propellers. It has a lifting body, which means it looks like a for lack of a better description and upside on boat. All of those features were built to create a more efficient airframe at Cruz. Another key feature that sets Alice apart is its lift to drag ratio, or how much lift the wing generates compared to how much drag it creates. Moving through the air. A regular plane has a lift to drag ratio of 17 to 1. For Alice, that rate is 25 to 1, meaning it's more aerodynamically efficient and uses less energy getting into the air for future passengers. All this environmentally conscious innovation means a lot less travelers. Guilt. I think it's important that the industry looks at its responsibility to the planet and makes itself more sustainable in terms of emissions. But it needs to work economically. Some players in the industry say electric planes could mean 40 to 80% lower airfares. That's because it doesn't cost as much to operate an electric plane. Aviation's Alice costs about $200 per flight hour to operate. A similarly performing turboprop would cost between $1,202,000 per flight hour. But in order to be truly sustainable, Omar says, people have to actually want to fly electric. This needs to feel like a plane you want to use daily. So how does Alice do that? Designers wanted the windows to be big enough to increase visibility, and they added stability technology to help with turbulence. Plus, Alice's electric engine is practically silent. This plane is dramatically less noisy, about two orders of magnitude less noisy than an equivalently sized aircraft. I think it could change the way we treat airports. Despite testing hiccups in early January, Omar estimates the plane will be certified by 2022. US based airline Cape Air has already decided to buy the aircraft at $4 million per plane. Three airline plans to introduce Alice into its fleet serving regional routes from Boston to Nantucket, Martha's Vineyard on up into New Hampshire and New York. In the very beginning, it was extremely difficult to convince partners, clients, anybody investors that were not delusional. Today it feels like everybody is on board and this is where the industry should go. The industry is beginning to notice that there is really a tectonic shift here.
B2 alice plane electric battery aircraft aviation Inside The $4 Million All-Electric Plane 18 1 林宜悉 posted on 2020/10/31 More Share Save Report Video vocabulary