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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What velocity is used to calculate maximum range and maximum endurance?
These are my data;
$C_{L_0} = 0.4$
$C_{L_{\alpha}} = 5.7$
$C_{L_{minD}} = 0.14$
$C_{D_{min}} = 0.022$
$k = 0.035$
$\alpha_{stall} = 15$
$S_{ref} = 20$
Mass Data
$W_{total} = 2500 \text{ kg}$
$W_{...
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What are the effects of whiteout (snow) and brownout (dust/sand) on a helo?
On all fronts, such as performance, engines, flight characteristics, etc.
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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....
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 "...
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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 ...
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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 ...
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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?
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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 ...
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what is ''extended runway centerline''?
When we calculate performance with fly smart，we see：‘‘Take off based on climbing on extended runway centerline‘‘.
What is the meaning of‘‘extended runway centerline‘‘？How long is Extended？
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Does cruise speed depends on rate of climb?
If an aircraft wants to fly at a fixed cruise speed, will the rate of climb have any effect on that? For example, let's assume an aircraft has to fly at a cruise speed of 0.8 Mach. How will the rate ...
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Why does the airplane manual state S1 is equal to or greater than the higher of ground minimum control speed or critical engine failure speed
I don't understand why S1 is equal to or greater than the higher of Ground Minimum Control Speed or Critical Engine Failure Speed (Vcef). I do understand that S1 has to be the lowest of Refusal Speed, ...
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Is there a reason for the difference in turbo prop exhaust placement?
The TBM 940 and Cessna caravan both have the PT6A turbo prop engine. The sister caravan has one single exhaust stack under the engine cowling, and almost all other small turbo props have dual exhaust ...
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What is the formula to calculate minimum knots groundspeed hydroplaning will occur?
Many articles on hydroplaning cite the following formula on the minimum speed necessary for hydroplaning to begin:
$$
9 * \sqrt{\text{Tire Pressure}} = \text{Maximum Hydroplaning Speed}
$$
Is this the ...
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What is a Integrated Avionics Unit (IAU) and is it related to a IMA?
Reading through a TBM 930 avionics handbook, I came across the integrated avionics unit. What does this do and how does it work? Also, why does the auto pilot only follow one flight director as seen ...
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optimal airplane propeller placement along the vertical axis?
is there a guideline for optimizing flight based on where the engine/propeller is placed along the vertical axis? some planes have the propellers well below the wings, some on the wings, some above ...
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How does a zero g aircraft work?
In upward motion, drag and gravity is in the same direction (both in downward direction). So in this situation G is negative or less than 1 or something else?
In downward motion with thrust greater ...
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Shockwave motion with angle of attack [duplicate]
why is the shockwave picking in itself off the aerofoil with increasing deflection of the leading edge?
Angle of attack:3degrees
Aerofoil: naca0018
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Why do beechcraft aircraft start with full mixture and throttle?
I've noticed that barons and bonanza's tend to start with full throttle and mixture. Why do they this as opposed to other aircraft that keep throttle at 1/4 inch and put full mixture forward for a few ...
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Why do shockwaves move aft with camber/trailing edge deflection? [closed]
Why does a shockwave move further towards the trailing edge with increasing camber?
Also, is the shockwave the thing above the aerofoil or behind it?
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What is the meaning of "airport pressure altitude" on a flight performance graph?
In a flight performance graph what is the meaning of airport pressure altitude? Is it the top of climb? Because if I set my altimeter to 29.92 it will give me the pressure altitude for an airport at ...
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What size jet engines would it take to make a Cessna 140 hover?
I'm building a STOL bush plane using 4 jet engines located at 4 different points on the aircraft. I would like to know what size jet engines it would take to hover something like a Cessna 140.
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Why would planes with two autopilots have just one active during cruise?
I know that the plane must have two autopilots for flying approaches, but why have individual buttons for each autopilot? Wouldn't it be easier to have both autopilots work at the same time for the ...
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Were European single-engine fighters considered superior to U.S. designs at the start of WW2?
There was a wide consensus in U.S. military circles about 1940 that U.S. pursuit fighters were substantially less capable in terms of performance than their equivalent European counterparts. ...
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