Bjorn’s Corner: Why e in ePlane shall stand for environment, Part 11. More electric aircraft.

February 28, 2020, ©. Leeham News: We now look at technology developments that make sense, and can deliver real improvements in the near future.

We start in this Corner with what more electric aircraft and engines can bring.

Figure 1. Boeing’s 787, the first more electric airliner. Source: Boeing.

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Bjorn’s Corner: Why e in ePlane shall stand for environment, Part 9. Hydrogen part 2.

February 14, 2020, ©. Leeham News: Last week we started looking at hydrogen as an alternative energy source for our air transport system. We discussed the use of hydrogen as a direct fuel replacement to jet fuel, burning the hydrogen in the combustor of the aircraft’s turbofans.

Hydrogen works fine as a fuel for the turbofan but it has challenges in its onboard storage, it’s handling and production. Good reader discussions followed around those problems. Now we look at hydrogen as a fuel in a fuel cell/electrical motor propulsion system.

Figure 1. Components of a fuel cell-based aircraft propulsion system. Source: NASA.

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Bjorn’s Corner: Why e in ePlane shall stand for environment, Part 8. Hydrogen.

February 7, 2020, ©. Leeham News: After discussing established ways of improving the environmental footprint of our air transport system and highlighting the challenges involved with an electric/hybrid route we now look at hydrogen as an alternative energy source.

We will quote from a study series made by Airbus at the turn of the century. It’s today 20 years old but its ideas and conclusions are more relevant than ever.

Figure 1. Hydrogen powered airliner from Airbus study. Source: Airbus study presentation.

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Bjorn’s Corner: Why e in ePlane shall stand for environment, Part 7. Efficiency of cars versus airliners.

January 31, 2020, ©. Leeham News: We now look at ways to increase the fuel efficiency of our airliner and by it, improve the CO2 situation for our environment.

Let’s start with understanding where we are with the efficiency of our present air transport system. To get a feel for where we are we will compare it to our road transport system.

Figure 1. A principal view of a two-spool airliner turbofan. Source: Wikipedia.

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Leasing industry sees a role in airline sustainability work

By Bjorn Fehrm

January 22, 2020, ©. Leeham News, Dublin: The yearly Air Finance Journal conference finished its second day with a Q&A with the top executives of the Leasing industry.

The Leasing companies buy 40% of all new airliners from the likes of Airbus and Boeing, to later rent them to the airlines on a monthly basis.

With 40% of all new aircraft delivered to these companies, their view on where we are in the cycle and what are the main challenges facing air transport is important.

The main topics during the three-day conference are the state of the airlines, the ease or difficulty to finance the purchase of $50bn of aircraft per year and the growing issue of air transport and the environment.

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Bjorn’s Corner: Why e in ePlane shall stand for environment, Part 5. Distributed propulsion.

January 17, 2020, ©. Leeham News: We continue our series why e in ePlane shall stand for environment and not electric, where we now examine the gains with electric/hybrid distributed propulsion systems.

We started last week with the type of boundary layer ingesting aft fans shown in Figure 1. Now we continue with wing mounted distributed propulsors.

Figure 1. Boundary-Layer Ingestion aft fans, driven by electric motors. Source: JADC.

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Airbus: We should fly like geese to save fuel and CO2

By Bjorn Fehrm

November 19, 2019, ©. Leeham News: Airbus presented a real innovative idea yesterday at the Dubai Air Show to reduce the environmental footprint of civil air transport. In the future we should fly like geese, it saves both fuel and CO2 emissions.

The airframer is starting a program to explore how the geese reduce their energy consumption while flying long distances. They fly in each other’s up-wash. This is to date the most innovative idea in the airframer’s quest to reduce air transport’s environmental footprint. Is it the most unrealistic? Perhaps not.

Figure 1. An A350 follows an A380, flying like the geese to gain from the upwash of the A380. Source: Airbus.

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