Bjorn’s Corner: Fly by Steel or Electrical wire, Part 5

August 23, 2019, ©. Leeham News: In our series about classical flight controls (“fly by steel wire”) and Fly-By-Wire (FBW or “fly by electrical wire”) we now look at practical implementations after discussing the authority of the flight… Read More

Bjorn’s Corner: Fly by steel or electrical wire, Part 4

August 16, 2019, ©. Leeham News: In our series about classical flight controls (“fly by steel wire”) and Fly-By-Wire (FBW or “fly by electrical wire”) we this week discuss the Flight Control System’s authority to execute maneuvers by… Read More

Bjorn’s Corner: Airliner yaw stability

Feb. 22, 2019, ©. Leeham News: After discussing an airliner’s pitch stability we now turn to the yaw stability. A stable aircraft in yaw means we don’t want the aircraft to wag its tail sideways while flying. The… Read More

Bjorn’s Corner: Pitch stability, Part 10. Wrap up.

Feb. 15, 2019, ©. Leeham News: We now summarize the problems around an airliner’s pitch stability and why a good pitch stability is so important before we go to the next subject, yaw stability. The pitch stability and… Read More

Bjorn’s Corner: Pitch stability, Part 8

Feb. 01, 2019, ©. Leeham News: In last week’s Corner, we covered the high-speed pitch stability problem most airliners have, Mach tuck. Now, we continue with low-speed problems which made Boeing introduce Speed trim on the 737.

Bjorn’s Corner: Pitch stability, Part 6

Jan. 18, 2019, ©. Leeham News: We have now covered the basics of pitch stability for an airliner and how a stable or unstable pitch moment curve looks. Now we look at different trouble areas. Straight and stable… Read More

Bjorn’s Corner: Pitch stability, Part 5

Jan. 11, 2019, ©. Leeham News: The week before Christmas we discussed the pitch stability of an airliner. We covered how a horizontal stabilizer made the aircraft stable in pitch, and why transonic airliners used a trimmable horizontal… Read More

Bjorn’s Corner: Pitch stability, Part 4

By Bjorn Fehrm December 14, 2018, ©.Leeham News: Last week we introduced a horizontal stabilizer to make our DC-9 like aircraft stable in pitch. We got a pitch moment curve which was forcing the nose down of the… Read More

Bjorn’s Corner: Pitch stability, Part 3

December 7, 2018, ©. Leeham News: Last week we looked at the pitch stability of an aircraft wing with fuselage. We could see the combination was unstable. Now we add a rear wing called a horizontal stabilizer to… Read More

Bjorn’s Corner: Pitch stability, Part 2

November 30, 2018, ©. Leeham News: Last week we started a series on pitch stability of aircraft. It has actuality as the reason Boeing introduced the now well-known MCAS (Maneuver Characteristic Augmentation System) was to improve the pitch… Read More