Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- Boeing reports mixed results of latest employee survey, but middle management and officers remain key obstacles April 22, 2025
- Hopes for 1Q financial progress turns into bumpy ride for Boeing April 21, 2025
- Bjorn’s Corner: Air Transport’s route to 2050. Part 18. April 18, 2025
- Natilus: Composite BWB, entry-into-service by 2029, 570 on order April 17, 2025
- China bans Boeing, US parts imports in tariff war April 15, 2025
Bjorn’s Corner: Sustainable Air Transport. Part 17. Gas Turbine Propulsion
April 29, 2022, ©. Leeham News: Last week, we looked at the thrust generating device that aircraft propulsion systems use. We could conclude that independent of how we create the shaft power, we can choose different thrust technologies… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 16. Thrust generation
April 22, 2022, ©. Leeham News: Last week, we examined propulsion system alternatives and their principal advantages and disadvantages. Now we go deeper into these alternatives. All propulsion systems for aircraft use a propulsion device like a propeller… Read More
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