Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- The Boeing 767 Cross Section, Part 1 November 24, 2022
- Movie Review: Devotion November 21, 2022
- China will accelerate development of its commercial aerospace sector November 21, 2022
- Bjorn’s Corner: Sustainable Air Transport. Part 46. eVTOL comparison with helicopter November 18, 2022
- The economics of a 787-9 and A330-900 at eight or nine abreast November 16, 2022
Bjorn’s Corner: Sustainable Air Transport. Part 46. eVTOL comparison with helicopter
November 18, 2022, ©. Leeham News: In the comments to last week’s Corner, there were requests for a comparison with a helicopter re. Sustainability (kWh/km). Here you go. I also threw in a cost of operations discussion, as… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 45. eVTOL, how green?
November 11, 2022, ©. Leeham News: We have spent some 50 articles going through the new air transport category, eVTOL, or electrically propelled Vertical TakeOff and Landing vehicles. They promise to replace the helicopter for local air transport… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 43. eVTOL IFR range.
October 28, 2022, ©. Leeham News: This is a summary of the article Part 43P, eVTOL IFR range. It discusses the range of a typical eVTOL flying a feeder mission from a city center to an airport during… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 43P. eVTOL IFR range. The deeper discussion.
Subscription required October 28, 2022, ©. Leeham News: This is a complementary article to Part 43, eVTOL IFR range. It discusses the typical maximum range we can expect from a certified eVTOL when it faces IFR weather conditions…. Read More
Bjorn’s Corner: Sustainable Air Transport. Part 41. VTOL mission calculations.
October 14, 2022, ©. Leeham News: Last week, we defined the phases of an eVTOL mission that shall show us the typical range and endurance of the eVTOLs of a hybrid vectored thrust/lift and cruise eVTOL, similar to… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 24. High Temperature Fuel Cells
June 17, 2022, ©. Leeham News: Last week, we looked at the installation effects and efficiencies of the fuel cell systems we discussed in earlier parts of the series. We could see the variants were significantly heavier than… Read More
Bjorn’s Corner: Sustainable Air Transport. Part 22P. Fuel Cell system efficiency and mass. The deeper discussion.
Subscription required June 3, 2022, ©. Leeham News: This is a complementary article to Part 22, Fuel Cell system efficiency and mass. It analyses the power, loss, mass, and efficiency consequences of the different fuel cell architectures described… Read More
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 15. Hydrogen propulsion system choices.
April 15, 2022, ©. Leeham News: Last week, we examined different airliner types’ power requirements and the importance of their size classes in the market. Now we look at what propulsion system alternatives are available when using hydrogen… Read More