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Questions tagged [flight-envelope]

Use for flight envelope related topics, e.g. V-n diagrams

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State of the art in aircraft industry for flutter analysis

I'm an aerospace engineering PhD student and for my research I'm investigating how to come up with a way to pick the most critical flight conditions for flutter. The main idea is to understand how it ...
user9870949's user avatar
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How much power and lift margin do helicopters have for hover?

Suppose you are designing a helicopter and trying to size the rotor system for hover and flight. Your helicopter has a certain gross weight at sea level, standard atmosphere. How much additional lift ...
Gerry's user avatar
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2 votes
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limits of the cg envelope graph for a helicopter

I am looking for information or any explanation, I want to know how this envelope is graphed, the limits (underlined in the image) from where they are obtained and what do they tell me? I want to know ...
Alex Ramirez's user avatar
2 votes
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Does angle of attack affect affect load factor?

I have been reading FAA Part 23 recently, and I have some confusion regarding the flight envelope of an aircraft. In some references, the maneuvering speed of an aircraft is written as follows: It ...
Albir17's user avatar
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3 votes
1 answer

In big transport jets, what is the difference between manoeuvring loads and gust loads?

In the design certifications for big transport jets, there are two factors that must be met in order for a new aircraft to be certified; manoeuvring loads, and gust loads. Why are these two separate ...
Lars Knowles's user avatar
1 vote
3 answers

Why is the maneuvering point (Va) in the V-n diagram defined as the upper intersection point? Why not the lower point one?

in my textbook and apparently everywhere online I have found that Va or cornering velocity is defined to be the point of intersection where the stall line and the limit load factor line meet. ...
YamchaAviator's user avatar
4 votes
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In this F-104 V-n diagram, why does the stall speed (in terms of IAS) decrease with altitude in some parts of the flight envelope?

(This question has been edited to reflect a change in perspective: based on answers to the related question What is causing these "corners" on this F-104 V-n diagram?, I now believe that the ...
quiet flyer's user avatar
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What is causing these "corners" on this F-104 V-n diagram?

In this V-n diagram for an F-104 (source: this Wikipedia link), on the left-hand edge of the flight envelope, what is causing the "corners" that we see at the following points? (Numbers are ...
quiet flyer's user avatar
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6 votes
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How does an aircraft's weight affect the V-n diagram?

I have a reasonable understanding of what a V-n diagram shows and what the envelope and the boundaries mean. However, the question I have is how does the weight of the aircraft specifically affect the ...
Matt K's user avatar
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17 votes
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How come planes can endure more positive than negative g's? I.e. how come V-n diagrams are not symmetric?

In this question A380 reverse thrust on only half the engines some doubts were raised about the strength of structures in certain directions. Specifically, Peter Kämpf states: Aluminium and ...
ROIMaison's user avatar
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