Bjorn Fehrm
Person on 2 sites
Aeronautical engineer and former fighter pilot; analyses aircraft design and airline economics at Leeham News.
-
1 channel on ppll (opens ppll.app)
-
Site: Leeham News (opens leehamnews.com)
“Would an A330-900F Make Sense? Part 4: Boeing’s Alternative”
-
Site: Leeham News (opens leehamnews.com)
-
8 beliefs on korrents (opens korrents.com)
-
Every aircraft propulsion system is an air pump, and accelerating a large mass of air a little is always more efficient than accelerating a little air a lot. (opens korrents.com)
“All propulsion systems are air pumps, and they work more efficiently if they accelerate a large mass of air to a small overspeed than vice versa.”
-
The multicopter air taxi is energy-intensive by construction, which holds its range to about twenty miles however good the batteries get. (opens korrents.com)
“The drone-like architecture of the multicopters is simple, but as the rotors are responsible for keeping the unit at a constant altitude with hover power, they represent an energy-intensive version of VTOLs. Their…”
-
Electrification transfers badly from cars to aircraft, because a car engine is under 10% efficient while a modern aero engine is already 30 to 40%. (opens korrents.com)
“the electric technology used for cars only has to beat energy hogs that are below 10% in efficiency, our everyday car. But to qualify for aircraft use, the technology has to equal or beat what is used today, which is…”
-
Every aircraft propulsion system is an air pump, and accelerating a large mass of air a little is always more efficient than accelerating a little air a lot. (opens korrents.com)