Questions tagged [aircraft-performance]

Aircraft performance covers areas such as the amount of runway required to takeoff or land and how fast an airplane can climb or descend.

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2answers
110 views

Can a plane with a thrust-to-weight ratio less than one fly vertically and perform loops?

In the game Battlefield 1 you can fly a Sopwith Camel vertically and perform different kinds of aerobatic maneuvers like loops. According to its specifications, its thrust-to-weight ratio should be ...
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2answers
380 views

What happens if I am flying at a higher Lift/Drag ratio than required?

Hello to all the experts! I created for me a table from an aircraft for Mach=0.8 for alpha= 0° to 8° Actually, I an alpha of alpha=4° should be sufficient, so that my lift coefficient is enough, to ...
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58 views

How to calculate the minimum possible flight speed of an aircraft?

So for the minimum possible flight speed an aircraft can fly with for a given altitude, I just use Lift=Weight and solve for the velocity. But: I need to insert a lift coefficient, which I can get ...
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4answers
126 views

Why doesn't temperature affect Pressure Altitude?

In this picture: it states the tops and bottoms of the 3 columns of air have the same pressure. This explains the error in altitude indications given in a non-standard temperature. Pressure only ...
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1answer
119 views

Fly a fixed wing single propeller airplane like a helicopter?

Has anyone tried to "helicopter" an airplane? And succeeded? And posted this video on the internet where I can find it? What I'm talking about with what I would call a "helicopter&...
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1answer
95 views

Why is there no lift component when calculating rate of climb?

I read this post about how to calculate the rate of climb How does climb-rate vary with density/pressure altitude? So in the image, all the forces are drawn. I am wondering, why the rate of climb does ...
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1answer
178 views

What is the correct range of the 787-10?

There are two conflicting values for the 787-10's range; they are: 6,345 NM (11,750 km) -- boeing.com 7,000 NM (12,975 km) -- on the same website few years ago, as well as flightglobal.com Note: In ...
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1answer
84 views

Relationship between Load-Factor AND Gliding Ratio

I am wondering about the g-load and its relation to the so called gliding ratio. I read this really good contribution here on this forum: Does lift equal weight in a climb? So the g load factor is ...
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2answers
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What is the effect of thrust vectoring effect on the rate of turn?

I just got a question after reading my old Principles of Flight book. The equation for the rate of turn is $\textrm{ROT} = 1,091 \cdot \frac{\tan(\phi)}{V}$, with $\phi$ denoting bank angle and $V$ ...
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40 views

What examples are there of top-mounted engine motor gliders?

I would like to know which motor gliders are there with regards to the following criteria: Top-mounted engine stowable landing gear great L/D ratio high maximum g-load at least 180kg usable weight? ...
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When the F16 is landing the AOA will be at 11 degrees, but speed modulates more. How is possible to have fixed AOA but not the speed?

The speed in landing pattern is not fixed one due to the weight/drag of the aircraft at the moment(loads of bombs and fuel). But if you speed up then you're going to go upwards don't you(if you keep ...
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4answers
152 views

Explained intuitively, why does aspect ratio affect induced drag?

Over the last few hours, I've been trying to intuitively understand induced drag, and how aspect ratio affects it. I already know the equations, but while they explain the relationship, they do not ...
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1answer
108 views

Question about the difficulty of a couple of airplane maneuvers [closed]

I have a hypothetical scenario and I was wondering if any experts might be able to speak to it. I will lay out the scenario, with a couple of specific questions, and maybe some honest answers will ...
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1answer
601 views

Why did Concorde have a 8000 ft airport elevation limit?

According to the Concorde Flying Manual Volume II(a) - 1 Operating Limitations - page 01.01.02 the take-off and landing airfield altitude is minimum -1000 ft and maximum 8000 ft. Why is Concorde ...
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3answers
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Why is the maximum endurance for a piston aircraft at sea level?

The Canadian Flight Training Manual stated this when talking about maximum endurance: For reciprocating engines, maximum endurance is achieved at sea level. The book does not explain further as to ...
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3answers
168 views

Downwind Myth Question

I was reading a discussion about the "Downwind Myth" and a doubt arose: If we are taking off with a 50knots headwind, that wind component will be part of our dynamic pressure, and so in that ...
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2answers
88 views

Which “Power Available” graph is more correct?

Trying to understand the drag and power required/available graphs for a piston + propeller airplane. Both graphs are from current book/website and while they are showing mostly the same thing, I ...
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1answer
105 views

Was the P-82 twin Mustang better than the P-51D? [closed]

The P-82 twin Mustang was made to replace the P-51D in the escort role. It was faster, and had two engines with two pilots. It also had a better armament but wasn't as maneuverable as the P-51D. Which ...
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0answers
31 views

What is the manoeuvre point?

a centre of gravity position at which stick force per g becomes zero What does this mean? If the centre of gravity happened to be at the maneouvre point, would there be stick be very light in the ...
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1answer
41 views

Does a constant speed prop deliver max speed at max manifold pressure and max RPM?

I was reading a discussion in flight simulator forum and I found this statement: Ignoring the issue of engine overheating, max MAP and max RPM is the best thing for max speed Do you agree with that? ...
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0answers
118 views

Why is the F-104 Starfighter’s afterburner thrust not greatly impacted by altitude?

Here is a page from the F-104 flight manual. It shows the flight envelope for the F-104 Starfighter with the powerful J79-GE-19 turbojet engine: I have a question regarding the shape of the ...
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1answer
120 views

What is the minimum bank angle that an older aircraft like the Cessna 172 can apply in a coordinated turn?

Suppose the weather conditions are favorable and there are no significant winds. The Cessna with a speed of 200km/h starts a coordinated turn with a bank angle of 0.1° The turning radius of this ...
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2answers
146 views

Why does “V1 increase with decreasing density”?

The statement made in the question is mentioned in one of the renowned publications. My contradictions which I have already ruled out as a potential solution: As Density decreases Vmcg decreases thus ...
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1answer
670 views

Why is the CG envelope wider when the aircraft is heavy?

I mean, the same aircraft, but empty or on MTOW. According to MAC, those limits are the same, but the indexes are different. So if I understand that correctly, the CG can be more forward when the ...
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2answers
108 views

Why does a Thrust Vector Control System increase maneuverability?

So why can a thrust vector control system increase my maximum g-load capacity? Because still n=L/G is relevant and if I can not provide enough lift (pointing up) to counter balance the thrust (...
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33 views

headwind, tailwind, weight, density exponents for DR400/180

I am trying to build a ground roll chart for Robin DR400/180 following the procedure described http://www.eaa1000.av.org/technicl/takeoff/topaper.htm#References. Does anyone know the tailwind, ...
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1answer
228 views

Is the quickest way to reverse direction by turning horizontally or vertically?

Assume my aircraft is flying with Mach 2 and I want to quickly change my direction of travel 180°. So for a horizontal turn flight I found the formula: angular velocity = g* sqrt(n²-1) / v For a ...
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1answer
114 views

After decades of solid research, mostly led by Robert J Englar, why is Circulation Control, the Circulation Control Wing not in use at all?

Any research on the CCW by Robert J Englar at Georgia Tech from the 60's into the 2000's. Many papers have confirmed Englar's work and in many cases, advanced it. This research has proven extreme lift ...
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1answer
267 views

What are U-2 loiter and stall speeds at low altitude?

I've read that a U-2's takeoff speed is around 115 mph (or kts?). Given those glider wings, how slow could one fly, lightly loaded, at low altitude? Say, less than 10,000 feet?
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24 views

Rate of climb equations for jet + propeller aircraft [duplicate]

For an aircraft with both jet and propeller, how do we calculate the maximum rate of climb? I know the equation of maximum rate of climb, velocity, and angle for propeller and jet, respectively. But I ...
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1answer
159 views

Relation between altimeter setting (QNH) formula and the barometric formula

I'm searching for a reliable source for a formulization of the QNH adjustment to the barometric altitude. I found this document from weather.gov that gives a formula for the Altimeter Setting, which ...
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3answers
156 views

Is “excess thrust” possible in a steady state vector diagram?

Being recently very much sold on the lift-weight-thrust closed triangle (with weight forming the hypotenuse) model for climbing flight, I proceeded to put the logic through its paces (validation) and ...
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1answer
114 views

What does “pitch plus power equals performance” really mean?

It is often said in aviation circles that "pitch plus power equals performance". A. What is it supposed to mean? B. Is it always true? C. If it isn't always true, why is it a useful concept ...
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1answer
207 views

Altimeter setting and pressure altitude

Student pilot here. I thought I was smarter than this, I’m struggling with this concept. I got the ASA test prep book and there’s a question asking what happens to the indicated altitude when the ...
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69 views

Is it possible for a higher aspect ratio wing to have increased drag compared to a lower aspect ratio wing of the same area?

Since increasing aspect ratio while maintaining wing area decreases chord, one can expect Reynolds number to decrease. Are there cases in which the resulting increased coefficient of friction would ...
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3answers
171 views

How can I find the maximum climb angle of a propeller driven aircraft from a graph of vertical velocity against airspeed?

I've been asked to find the maximum climb angle of a propeller driven aircraft from the graph of vertical velocity against airspeed: How can I do that?
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2answers
130 views

Could drag in a turn be twice the drag in straight and level flight?

Just wanted to see if my understanding of drag is correct as I am unsure. I understand that during straight and level flight, the drag can be calculated as: With the first term being the parasitic ...
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3answers
71 views

Determining the total drag of a propeller driven aircraft while turning with a load factor of n = 2?

I understand that the total drag includes the parasitic and induced component, with the parasitic component being the same as with straight and level flight. How do I calculate the induced component? ...
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3answers
167 views

How does downwash affect angle of attack?

Many aerodynamics textbooks, as well as many answers on here and similar websites claim that the downwash downstream of a wing induces a net angle of attack that is lower than just looking at flow ...
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1answer
146 views

Barrel Roll Airliner Landing [duplicate]

Can this barrel roll in an airliner be ferformed by a skilled pilot? Is this real?
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1answer
257 views

How do power and thrust curves compare?

I would like to really understand why when talking about jets we care about thrust but when talking about propeller aircraft we care about power. (THRUST)="Just a force" (POWER)= work/time = ...
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1answer
104 views

Why is one exhaust directed upwards? [duplicate]

This is the first Cessna Skycourier during certification. Why are the two exhausts oriented upwards?
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225 views

Roller Coaster Airline

Could an airliner legally (using a common regional jets or less likely airliners) and safely perform acrobatic maneuvers that would otherwise not be permitted for commercial passenger flights. Why? ...
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3answers
318 views

Can Airbus A400M take-off from the beach fully loaded?

I've recently saw this footage. Airbus A400M tactical capabilities on natural surfaces by performing take-off, landing and taxiing manoeuvres. I wonder if she could take-off fully loaded from that ...
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53 views

What is the difference between Line-Replaceable Unit (LRU) and Line Replaceable Modules (LRM)? [duplicate]

i am studying Line-Replaceable Unit (LRU) and Line Replaceable Modules (LRM) but do not know the difference.
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1answer
103 views

Are there any characteristics of a hypoxic flight? [closed]

Any patterns that investigators look for? For example, what happens when the engine flames out? is it guaranteed to enter a high speed dive? And would this affect certain parts of the aircraft, ...
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4answers
329 views

How can L/D Max be both Best Glide speed and Max Range speed?

According to the book "Aerodynamics for Naval Aviators", best glide speed AND max range speed for propeller aircraft both occur at L/D max. This is a little confusing because in an A36 ...
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0answers
55 views

In symmetrical airfoils is the stall angle the same for negative AOAs as for positive ones? [duplicate]

In symmetrical airfoils is the stall angle the same for negative Gs as for positive ones? Let say the stall angle is 17 degrees AOA. Is it the same if you push the nose down?
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99 views

Landing at 30,000 ft [duplicate]

Excluding how a runway would exist at 30,000 ft, could landing a plane at that altitude be done? What would it take to do so? Very Basic Wind rose for Mount Everest Weather Phenomena That Could ...
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2answers
119 views

How does altitude affect the TAS and thrust of an electric fan powered aircraft?

I'm confused about the relation between IAS, TAS, thrust, and shaft power, for an electric application. Yes, higher air is thinner, and thrust goes down due to higher airspeed. What I've researched ...

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