Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- GE testing of giant GE9X engine aims for maturity at entry into service June 30, 2025
- Bjorn’s Corner: Air Transport’s route to 2050. Part 28. June 27, 2025
- Parent agency, FAA often at odds as politics outweighs safety June 26, 2025
- Electric Flight and the Ugly Duckling June 25, 2025
- Engine makers tout “Plan A” but have “Plan B” backups in R&D June 23, 2025
Bjorn’s Corner: The challenges of hydrogen. Part 26. Auxiliary power
February 26, 2021, ©. Leeham News: Last week we discussed auxiliary power generation for a hydrogen aircraft and found that a fuel cell system had many attractions. However, it’s more challenging to develop than a hydrogen-converted APU, and… Read More
Bjorn’s Corner: The challenges of hydrogen. Part 25. Auxiliary power
February 19, 2021, ©. Leeham News: Last week we discussed hydrogen aircraft propulsion and found a shaft power producing gas turbine was considerably more weight-efficient than a fuel cell powering an electric motor. Both had the same 55%… Read More
Bjorn’s Corner: The challenges of hydrogen. Part 24. Propulsion choice
February 12, 2021, ©. Leeham News: After covering the basics of fuel cells last week in our hydrogen airliner series, we now look at what type of system to choose for aircraft propulsion and onboard systems power. We… Read More
Bjorn’s Corner: The challenges of hydrogen. Part 23. Hydrogen fuel cells
February 5, 2021, ©. Leeham News: Last week, we started the discussion around fuel cells as a source of electric energy in airliners. We went through the principle and asked some vital questions. Now we look at different… Read More
Bjorn’s Corner: The challenges of hydrogen. Part 22. Hydrogen fuel cells
January 29, 2021, ©. Leeham News: Over the last weeks, we looked at Center of Gravity (CG) problems with rear fuselage liquid hydrogen tanks as used in Airbus’ ZEROe turbofan airliner concept. We can conclude that the CG… Read More
Bjorn’s Corner: The challenges of hydrogen. Part 21. Hydrogen airliner weight shift
January 22, 2021, ©. Leeham News: In last week’s Corner, we looked at how the hydrogen consumed in the rear fuselage tanks changes the airliner’s Center of Gravity (CG). Now we discuss how this change of Center of… Read More
Bjorn’s Corner: The challenges of hydrogen. Part 20. Hydrogen airliner weight shift
January 15, 2021, ©. Leeham News: In last week’s Corner, we looked at how hydrogen consumed in the rear fuselage tanks of Airbus’ ZEROe concept affect the airliner’s efficiency. Now we look at other aspects of the rear… Read More
Bjorn’s Corner: The challenges of hydrogen. Part 19. Hydrogen airliner weight shift
January 8, 2021, ©. Leeham News: In our Corner before Christmas we discussed the hydrogen tank placement at the rear of the aircraft for Airbus’ ZEROe concept turbofan aircraft. We now calculate how the weight transfer when emptying… Read More
Bjorn’s Corner: The challenges of hydrogen. Part 17. Hydrogen airliner program
December 11, 2020, ©. Leeham News: We use this Corner to define the time table for our hydrogen airliner program and for what areas we need to conduct risk-reducing research before we embark on an actual design. As… Read More
Bjorn’s Corner: The challenges of Hydrogen. Part 16. A Hydrogen airliner
December 4, 2020, ©. Leeham News: To dig a level deeper into the challenges of hydrogen airliners, as a next step we design such a plane (on a high level), now that we have covered the basics. It… Read More