Bjorn’s Corner: Aircraft engines in operation, Part 3

February 3, 2017, ©. Leeham Co: In the last Corner, we went through how our airliner engine reacts to the different phases of flight, including what happens when we operate in a hot environment. We also showed how engine… Read More

MRJ regional jet delayed until mid-2020

By Bjorn Fehrm January 23, 2017, ©. Leeham Co: Mitsubishi announced a further two years delay of the MRJ regional jet project in a press conference in Tokyo today. The 90-seater variant of the aircraft will be delivered to… Read More

The regional market and scope clauses

By Bjorn Fehrm January 17, 2017, ©. Leeham Co: Union contract Scope Clauses–the provision limiting the weight, capacity or number of aircraft operated by airlines for major carriers–are unlikely to be modified any time soon, panelists at the Air Finance… Read More

Bjorn’s Corner: Geared turbofans

January 13, 2017, ©. Leeham Co: The time has come to go through the reasons why some turbofan engines are designed with a gearbox between the fan and the low pressure shaft. The principle design is shown in… Read More

Bjorn’s Corner: Turbofan developments in 2017

January 06, 2017, ©. Leeham Co: Before we finish of our series on airliner turbofan technology, let’s spend this Corner on what will happen on the airliner engine front during 2017. While there is no totally new engine that… Read More

2017: the year ahead

Subscription Required Introduction Jan. 3, 2017, © Leeham Co.: The New Year is here and it doesn’t look like a good one for commercial aerospace, if measured against previous outstanding years. There are some troubling signs ahead, piling… Read More

The Boom SST engine problem, Part 2

By Bjorn Fehrm Subscription required Introduction December 01, 2016, ©. Leeham Co: Boom Technology and Virgin Atlantic plan to offer supersonic business class passenger traffic over the Atlantic. We covered the number of challenges that this poses in recent… Read More

Bjorn’s Corner: Turbofan engine challenges, Part 4

  November 18, 2016, ©. Leeham Co: In our series on modern turbofan airliner engines, we will now go deeper into the compressor part. Last week, we covered the fundamentals of compressors. As compressors and turbines use the same… Read More

Clouds overhang Bombardier ahead of earnings call

Subscription Required Introduction Nov. 9, 2016, © Leeham Co.: Bombardier reports its 3Q2016 and nine month earnings Thursday and as the year prepares to enter its last 45 days, disappointment hangs over the company and the stock. Summary… Read More

Bjorn’s corner; Turbofan engine challenges; Part 2

November 04, 2016, ©. Leeham Co: We will now start to go through a modern turbofan airliner engine and look at the technologies which are used and what are their technical challenges. We will start today with the engine… Read More