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: Sustainable Air Transport. Part 14. Propulsion system requirements.
April 8, 2022, ©. Leeham News: Last week, we discussed the architecture of a liquid hydrogen fuel system. We now start looking at the propulsion system of a hydrogen aircraft. Before discussing how a propulsion system is done,… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 13. Hydrogen fuel system and APU.
April 1, 2022, ©. Leeham News: Last week, we looked at how to store hydrogen in an aircraft. We could see the gaseous storage of hydrogen is too heavy other than for demo systems and extreme short-haul. For… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 10. Where Hybrids work.
March 11, 2022, ©. Leeham News: After our articles about Serial Hybrids and Parallel Hybrids showed they were unsuitable for airliners, where do these make sense? The obvious answer is for our stop-and-go cars (as we then can… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 9P. Parallel Hybrid. The deeper discussion.
Subscription required By Bjorn Fehrm March 4, 2022, ©. Leeham News: This is a complementary article to Part 9. Parallel Hybrid. It uses Leeham Company’s Aircraft Performance Model from our consultancy practice to analyze the design of a… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 1. A deeper look.
January 7, 2022, ©. Leeham News: We finished a 34 article series before Christmas about the enormous work involved to get a new aircraft certified for passenger transport. It was a background article series to the one we… Read More
Sustainable Aero Lab disqualifies “Greenwash” investments
By Bjorn Fehrm August 25, 2021, ©. Leeham News: Times change and the use of words with it. Today, the hundreds of UAM Air Taxi projects talk about how “environmentally friendly” this mode of transportation is, and Boom’s… Read More
Bjorn’s Corner: The challenges of airliner development. Part 14. The ATO.
July 30, 2021, ©. Leeham News: Last week, we went through the later tasks in the Prelaunch Phase. We talked about Concept refinement, Supplier selection, and Certification work. Now we dig deeper into the important Authorization To Offer… Read More
Bjorn’s Corner: The challenges of airliner development. Part 13. Later in the Prelaunch Phase
July 23, 2021, ©. Leeham News: Last week, we went through the initial tasks in the Prelaunch Phase. We talked about Sales and Marketing activities, initial Concept development, and first Supplier contacts. Now that time has passed, we… Read More
De-carbonisation of air transport is ON
By Bjorn Fehrm July 20, 2021, © Leeham News: Last week was a game-changing week for air transport. Three events synchronized to trigger it. EU presented 13 policies to achieve net-zero greenhouse gas emissions by 2050 with concrete… Read More
Bjorn’s Corner: The challenges of airliner development. Part 12. The Prelaunch Phase.
July 16, 2021, ©. Leeham News: Last week, we showed the first cut of an overall Program Plan for our 19 seat airliner project. Now we discuss the Prelaunch Phase activities in more detail, including what type of… Read More