All Questions
3 questions
12
votes
2
answers
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Why does directional stability decrease at supersonic speeds?
As an aircraft accelerates through the transonic region from full subsonic to to full supersonic flow its directional or yaw stability decreases. What causes this reduction?
- 7,092
10
votes
1
answer
1k
views
Why do some Mach trimmers move the elevator?
A pop-up rod on a the FO's control column on a DC-9 that shows the Mach trim position. (YouTube)
Regarding the title, I'm not sure if it's just some or all jetliners (I tried to research it). On the ...
user14897
3
votes
2
answers
216
views
Why do semitailless swept-winged aircraft, but not delta-winged aircraft, suffer from (primarily) pitch oscillations at high mach?
Semitailless1 swept-wing aircraft without active stability enhancement2 generally3 have extremely poor handling characteristics, most notably a tendency towards violent pitch oscillations at high ...
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