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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A transfer function relating jet engine thrust to pitch angle during a phugoid motion

Crossposted on Mathematics SE I am doing a school project that requires me to find a transfer function that relates the thrust of a jet engine (which could change with time in one way or another) and ...
Faito Dayo's user avatar
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Are UDF/Propfan Engines Thrust Producing or Power Producing? [duplicate]

For the purposes of aircraft performance (best endurance/range speeds, Vx, Vy, etc.) would a propfan be considered a power producing engine or a thrust producing engine? I would imagine it would be ...
Sauerkraut9's user avatar
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1 answer
161 views

For a fixed density altitude, how does climb performance depend on pressure altitude?

Below is the climb performance from the 1978 Cessna 152 POH, which I've plotted as climb rate versus density altitude. It shows that higher pressure altitude gives decreased performance even when the ...
Chris's user avatar
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Why are these characteristics of the FT-180 highlighted?

I have been checking the FT-180 engine used to establish speed record for remotely controlled aircraft (i.e. model airplanes). There are some specific features highlighted on the manufacturer site. I'...
totalMongot's user avatar
2 votes
2 answers
153 views

Why does Vx increase with altitude and Vy decrease?

As an airplane climbs, the best angle of climb airspeed (Vx) increases and the best rate of climb airspeed (Vy) decreases. I can't figure it out, why does it happen? I Hope someone explains it to me I ...
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climb angle of 737-800 performance [duplicate]

I am doing a report on 737-800 and I have questions about its climb angle performance; I am plotting a climb angle VS altitude graph for the aircraft, why does the climb angle take off at an angle and ...
user65712's user avatar
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332 views

Why does the climb angle of 737-800 peak shortly after take-off before reducing again?

I am doing a report on 737-800 and I have questions about its climb angle performance; I am plotting a climb angle VS altitude graph for the aircraft, why does the climb angle take off at an angle and ...
user65712's user avatar
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Engine Performance Data for GE F414-400

I am currently in Capstone for ASE, and for our course we have been tasked with reverse engineering the X-59 QueSST created by NASA and Lockheed Martin. I am the propulsion lead for our team and I ...
Derrick John's user avatar
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What’s the difference between a compressor stall and a surge from the cockpit?

I understand the difference between a compressor stall and surge. Stall: One or two blade stages exceed the critical AoA, the airflow is turbulent, and the smooth airflow through the compressor is ...
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Is my understanding about Balanced Field correct?

We have two definitions: Balanced Field where Takeoff Distance Required = Accelerated Stop Distance Required Balanced V1 = This is the speed where on a balanced field length (TODR=ASDR) if we have ...
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What are the effects of whiteout (snow) and brownout (sand/dust) on helos?

Is there any other effect besides low visibility? Both seem to show very similar conditions.
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What type of ailerons does the Piper Seminole has?

I understand that the PA44 has differential type ailerons, but do they also have frise type ailerons? Making them a combination of differential and frise type similar to the Cessna 150/152/172 models? ...
Breaach's user avatar
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Is the Lift required for a steady-state climb and descent equal for the same absolute value of the kinematic climb angle? [duplicate]

Here is my confusion : I found in my lecture script the following equation for the steady-state climb and descent (wings level) ...
Christian Mändle's user avatar
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141 views

What differences would a helicopter designed to withstand many negative Gs have compared with a normal one?

There are a few helicopters that are able to take negative G's, and to this day only one can actually perform aerobatics (ie. Chuck Aaron's BO-105). The BO 105 is a rigid rotor helicopter that has ...
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Why is a flat turn less efficient than a coordinated turn?

How I understand a flat (rudder-only) turn: AOA between relative wind and the fuselage of the airplane causes a sideslip in the direction of yaw. Vertical stabilizer weathervanes into the relative ...
astroball's user avatar
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Is the Reference Speed (Vref) the same as the speed at which the aircraft cross the runway threshold in landing phase?

Just a little confuse when I learned about the aircraft classification based on approach speed. Can anyone help me to have an accuracy look about this question?
Harry Huynh's user avatar
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What velocity is used to calculate maximum range and maximum endurance?

These are my data; $C_{L_0} = 0.4$ $C_{L_{\alpha}} = 5.7$ $C_{L_{minD}} = 0.14$ $C_{D_{min}} = 0.022$ $k = 0.035$ $\alpha_{stall} = 15$ $S_{ref} = 20m^2$ Mass Data $W_{total} = 2500 \text{ kg}$ $W_{...
Bugra's user avatar
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Can vortex ring state (VRS) be solved by shaping the blades so that the vortexes they produce are weak enough not to form a vortex ring?

Vortex Ring State is one of the hazardous states a helicopter can find itself into. VRS happens when a helicopter has low airspeed (and usually hovering OGE) and is descending. If the helicpoter is ...
BanzaiFighterbomber's user avatar
1 vote
2 answers
163 views

Does the ground effect change with temperature changes?

The title is my question. Does the ground effect change as the temperature of the ground changes? In cold weather, a more cushion effect can be expected, and in hot weather vice versa?
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Question about V1 Vr V2 computations

On ASA’s ATP test book they mention the following: “V1 is computed using the actual airplane gross weight, flap setting, pressure altitude and temperature.” I understand that v1 gets adjusted for ...
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Confused about screen height definition

I’m a bit confused about screen height definition and I’m seeking help to understand it. I understand that this height for landings is at least 50 ft above the landing threshold for all airplane ...
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Can supercharger/turbocharger increase absolute ceiling

Superchargers and turbochargers can increase the service ceiling. Then what about the absolute ceiling? Can superchargers or turbochargers increase it?
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If I am at absolute ceiling, can I climb further by trading airspeed for altitude?

If I am flying at absolute ceiling, can I still climb by trading airspeed for altitude?
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What are the key differentiating factors between the flight control systems employed in unmanned drones and those utilized in piloted aerial vehicles?

"I've come across open-source projects like ArduPilot that are commonly used with microcontrollers like Pixhawk for unmanned aircraft. However, I'm unsure whether these systems can be adapted for ...
Rohit Anand's user avatar
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Why is this plane indicating an altitude of 117,200 feet?

Looking at a plane tracker, I found something where the altitude is crazy high. Could it be a plane masking identity?
Josh's user avatar
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Why does a sudden tailwind/headwind change IAS?

I read the following statement: “tailwind quickly changing to a headwind causes an increase in airspeed and performance. Conversely, a headwind changing to a tailwind causes a decrease in airspeed and ...
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Help me understand the A220-100 takeoff chart

Here is the takeoff performance chart of the Airbus A220 (CS100). According to Wikipedia, the MTOW runway length needed is 1500 metres. However, this chart seems to suggest that a runway length of ...
Knathuul's user avatar
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How would Vy be adjusted for changes in gross weight?

For piston propeller aircraft, Vy calibrated airspeed[CAS] is equal to CAS for best Lift/drag at the plane's absolute ceiling, and at lower altitudes Vy increases above best L/D as excess power is ...
Max Power's user avatar
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Do you pitch the nose up or down when flying at best glide speed during a glide

So in a glide, flying at the best glide speed, will you be pitching the nose up (nose points above the horizon) or pitching the nose down (nose points below the horizon) or does it depend?
Hitomhi's user avatar
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Is more rudder pressure needed in gliding turns than normal turns

The FAA Airplane Flying Handbook says the rudder compensates for yawing tendencies when rolling in or out of a gliding turn; however, the required rudder pedal pressures are reduced as a result of ...
Hitomhi's user avatar
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Should I advance my propeller lever forward during a glide?

I am reading the FAA Airplane Flying Handbook, chapter 3. It says: To enter a glide, the pilot should close the throttle and, if equipped, advance the propeller lever forward. (...) Why do we ...
Hitomhi's user avatar
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Should you trust the POH in this regard?

The pilot's operating handbook (POH) says my take off and landing distance are 945ft and 550ft for landing. Is it wise to increase those factors to 1000ft for safety? Will I be penalized on the oral ...
youngpilot's user avatar
4 votes
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826 views

Why the heavier the aircraft is, the higher the airspeed must be to obtain the same glide ratio?

I know weight does not affect glide ratio. But why does higher weight need higher gliding speed?
Hitomhi's user avatar
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FAA's Airplane Flying Handbook says more lift is necessary during a climb. Isn't it the opposite? [duplicate]

"If a climb is started from cruise flight, the airspeed gradually decreases is the airplane enters a stabilized climb attitude. The thrust required to maintain straight-and-leve flight at a given ...
Hitomhi's user avatar
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Is more lift needed for a stabilized climb [duplicate]

First, the photo depicts a vector diagram during a climb. L means Lift. Lv means the vertical component of lift. Lh means the horizontal component of lift. T means Thrust. D means drag. W means weight....
Hitomhi's user avatar
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Can I climb with no excess thrust [duplicate]

I've been searching on the internet about this question and all say you are not able to climb with no excess thrust. But I am wondering that if I have no excess thrust, can I still climb in exchange ...
Hitomhi's user avatar
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What are some of the advantages of inverse-tapered wings?

Inverse tapered wings are rarely used in aviation. The only legitimate plane I know about with inverse-tapered wings is the XF-91 Thunderceptor. So why aren't they used. What are the disadvantages of ...
Mateo's user avatar
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What does 3 blinking red lights on a small aircraft indicate?

I live by Lackland Air Force Base in San Antonio, Tx and have lived here 18 years and was also Airborne in the Ay and I just saw a small private aircraft fly above me with 3 flashing lights with 2 on ...
Felix Perez's user avatar
4 votes
1 answer
847 views

What is the max landing altitude of the Airbus A320 family?

I know the Boeing 737's max landing altitude is 8,400ft standard and 12,000ft with the high altitude option. I am struggling to find the same figures for the A320 family. All I can find online is the ...
1nf's user avatar
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1 answer
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Why is only one rudder deflected on this Su 35?

Why does the aircraft has only one rudder deflected in this picture?
George Geo's user avatar
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2 votes
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What is the longest range unrefueled production aircraft?

I was looking at the re-engined B52 project which was supposed to extend its 8800sm unrefueled combat range/10,145sm ferry range by 40%, making it 12,320/14,203sm. What is the longest range unrefueled ...
Pilothead's user avatar
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Are Pitch Attitude and %N1 values for single-engine flight provided in the Boeing 737 Documents, or are pilots required to rely on “rules-of-thumb”?

In the Boeing 737-700/800 Quick Reference Handbook (QRH), the section titled "Performance Inflight - QRH" provides Pitch Attitude and %N1 values for various weights and pressure altitudes ...
tedioustortoise's user avatar
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2 answers
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Why does the trailing edge have a more pronounced taper than the leading edge on the Cessna 172?

Why does the Cessna 172 have a more pronounced taper on the trailing edge as opposed to the leading edge?
Boeing787's user avatar
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Why does thrust differ in different reference frames?

If a jet engine flies with 4 m/s in the air and we want to calculate thrust for two different reference frames, can we prove that the calculated thrust for both reference frames are equal to each ...
Jawel7's user avatar
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5 votes
3 answers
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Is it possible to determine a maximum L/D possible

Over the last couple of decades L/D ratio has increased significantly. Is it possible to determine an "upper limit" on how much more potential there is for common tube-wing aircraft to ...
rohrerph's user avatar
2 votes
1 answer
170 views

Why do composite materials not decrease the OEW

Boeing states in an article, that the 787 Dreamliner saves around 20% of weight in a comparison to an aluminium based aircraft. Boeing 787 Dreamliner When comparing the 787 Dreamliner to other "...
rohrerph's user avatar
6 votes
3 answers
206 views

is pressure altitude at different temperatures (different days) on the ground at the same airfield the same?

let's say we are at x-airfield which is at 0 MSL on the ground. We set the Kollsman window to 29.92 on a standard day, whatever the read is that would be the Pressure altitude, correct? (ideally zero ...
YamchaAviator's user avatar
9 votes
1 answer
570 views

Can the use of flaps reduce the steady-state turn radius at a given airspeed and angle of bank?

Note that for the purposes of this question, I am only interested in the scenario described below. By 'steady-state' I mean to exclude from consideration the short-term effects of changing the flap ...
sdenham's user avatar
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What is the approximate lifespan of H125 helicopter

What is the lifespan of the Airbus H125 helicopter used by law enforcement agencies?
AlexT's user avatar
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3 answers
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How can flow in the compressor of a jet engine go back to the inlet?

In aerodynamic lessons and books about jet engines, it is always said that there is a risk that air flow in the combustion chamber or compressor can go back to reverse direction, towards the inlet if ...
Jawel7's user avatar
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