Leeham News and Analysis
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Leeham News and Analysis
- RTX Q1 2025 Earnings: GTF Talk Takes A Back Seat To Tariffs April 22, 2025
- Tariffs Tumult Takes Over GE Aerospace Q1 2025 Earnings Call April 22, 2025
- 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
Bjorn’s Corner: New aircraft technologies. Part 9. Engine core advances
By Bjorn Fehrm.
April 21, 2023, ©. Leeham News: This is a summary of the article New aircraft technologies. Part 9P. Engine core advances. The article discusses how developments for the next-generation airliner engine cores will increase the thermal efficiency of next-generation engines.
Figure 1. The Pratt & Whitney PW1100G engine with its compact core enabled by a geared high RPM design. Source; Pratt & Whitney.
Bjorn’s Corner: New aircraft technologies. Part 9P. Engine core advances
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By Bjorn Fehrm
April 21, 2023, ©. Leeham News: This is a complementary article to Part 9. Engine core advances. It discusses in detail the next-generation propulsion system cores and what efficiency improvements to expect from different technological advancements.
Bjorn’s Corner: New aircraft technologies. Part 8. Propulsion advances
By Bjorn Fehrm
April 14, 2023, ©. Leeham News: This is a summary of the article New aircraft technologies. Part 8P. Propulsion advances. The article discusses how developing the next-generation airliner propulsion system will be the second most important area after we decide on the fuselage type and what to expect from increases in Propulsive efficiency.
Figure 1. The Ultrafan demonstrator readied for tests, with its 140-inch fan giving a bypass ratio of 16:1. Source; Rolls-Royce.
Bjorn’s Corner: New aircraft technologies. Part 8P. Propulsion advances
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By Bjorn Fehrm
April 14, 2023, ©. Leeham News: This is a complementary article to Part 8. Propulsion advances. It discusses in detail the next-generation propulsion and what efficiency improvements to expect from different technological advancements.
Bjorn’s Corner: New aircraft technologies. Part 7. Propulsion
By Bjorn Fehrm
April 7, 2023, ©. Leeham News: This is a summary of the article New aircraft technologies. Part 7P. Propulsion. The article discusses how developments in the next-generation airliner propulsion system will be the second most important area for improved efficiency and lower emissions after we have decided on the fuselage type.
Figure 1. The CFM LEAP engine gained 15% efficiency compared to the engine it replaced, the CFM56. Source: CFM.
Bjorn’s Corner: New aircraft technologies. Part 7P. Propulsion
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By Bjorn Fehrm
April 7, 2023, ©. Leeham News: This is a complementary article to Part 7. Propulsion. It discusses in detail the next-generation propulsion systems and what to expect from their possible increase in performance and efficiency.
Bjorn’s Corner: New aircraft technologies. Part 6. Fuselage manufacturing
By Bjorn Fehrm
March 31, 2023, ©. Leeham News: This is a summary of the article New aircraft technologies. Part 6P. Fuselage manufacturing. The article discusses how a non-circular cross-section drives material use towards composites and the difficulties of manufacturing aeronautical composite structures in high volumes.
Figure 1. The elliptical NMA cross-section compared with A321 and 767 cross-sections. Source: Leeham Co.
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Bjorn’s Corner: New aircraft technologies. Part 6P. Fuselage manufacturing
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By Bjorn Fehrm
March 31, 2023, ©. Leeham News: This is a complementary article to Part 6. Fuselage manufacturing. It discusses in detail how to manufacture a non-circular fuselage that avoids fatigue problems.
Bjorn’s Corner: New aircraft technologies. Part 5. Optimal fuselage
By Bjorn Fehrm
March 24, 2023, ©. Leeham News: This is a summary of the article New aircraft technologies. Part 5P. Optimal fuselage. The article discusses different cross-sections and how these drive drag and weight. The cross-section chosen depends on the container type employed for the area below the floor.
Figure 1. Cross sections using different size cargo containers. Source: Leeham Co.
Bjorn’s Corner: New aircraft technologies. Part 5P. Optimal fuselage
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By Bjorn Fehrm
March 24, 2023, ©. Leeham News: This is a complementary article to Part 5. Optimal fuselage. It discusses in detail the optimal fuselage for an airliner with 250 seats using different architectures and building methods.