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Questions tagged [flight-mechanics]

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1
vote
3answers
109 views

Why does an aircraft's nose tend to pitch downward at higher bank angles?

In the usual aircraft configuration, the center of lift is located behind the CG producing negative pitch moment (the horizontal stabilizer counteracts it by producing downforce - positive pitching ...
4
votes
2answers
171 views

What is a rudder or fin stall?

What is a rudder or fin stall, how will the aircraft behave in that situation, and how should the pilot recognise it? What is the recovery procedure? And what is rudder reversal?
0
votes
2answers
107 views

Is drag higher when flying in a crosswind?

Is this true that during a flight with a crosswind the drag increases due to the fact that the relative wind blows at a certain angle to the aircraft's nose but not precisely in the opposite direction ...
4
votes
2answers
340 views

'Gravitational' power vs. engine power

A glider gets the power it needs to fly from the decrease of gravitational potential energy associated to the descent. My question is: for the same weight $W$, airspeed $V$, and a prop efficiency of ...
0
votes
0answers
116 views

Is there a fixed ratio between highest L/D and max endurance L/D?

It can be demonstrated that, for any airplane, there is a fixed ratio between the maximum range and maximum endurance speeds (1.31607...). Does another, fixed ratio exist between highest L/D and L/D ...
0
votes
0answers
32 views

What are the constant parameters for Type 2 analysis in XFoil and XFLR5?

The documentation says "Type 2" analysis is used for determining a drag polar for an aircraft at 1-g. Mach and Reynolds numbers in this type of analysis are not constant and replaced with $M \sqrt{C_{...
6
votes
1answer
372 views

Can the fly-by-wire system of a modern airliner handle an unstable condition?

According to this answer airliners/large passenger aircraft such as an A320 are designed such that they are longitudinally, statically stable under normal flying conditions. What if, for some reason, ...
8
votes
2answers
676 views

What is an acceptable phugoid oscillation duration?

What is an acceptable settling time for the phugoid mode in a large aircraft? As a more specific question, what is the settling time when the aircraft (say, a B747 or an A320) switches from Climb to ...
15
votes
8answers
9k views

Does lift equal weight in a climb?

This subject keeps coming up in the discussions and questions such as this one, which asks if lift equals weight in level flight. Good answers there, pointing out that upwards force has many sources. ...
28
votes
8answers
4k views

Is excess lift or excess power needed for a climb?

As answered in this question, aircraft need excess power - not excess lift - to climb. This is plausible when the aircraft's thrust vector has a vertical component (its nose and engine points upwards),...