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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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 ...
delta2014's user avatar
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What is the comparative roughness of fabric surfaces?

"The Design of the Aeroplane" by Darrol Stinton (1983) lists comparative roughness of aircraft skin material (pg 154). Unfortunately it does not list dope & fabric. What is the comparative ...
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What is the origin/history/background for performance categories A,B,C?

What is the thought process behind performance categories A,B and C? I know they were done based on MTOW 5700 kg, 9 pax and engine drive. I understand the table of classification, but I would like to ...
Tough questions's user avatar
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First Boeing 757-200 N757A 'Catfish' was modified with a Canard foreplane. How did it behave?

The aircraft had these changes made around 2006 to act as an F-22 Avionics test bed. One would expect that the fore plane changed many performances of machine, including take off and landing attitude ...
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What is the stall speed of the Antonov An-225?

Under certain circumstances - maximum gross weight, unaccelerated 1G flight, clean configuration (landing gear up and flaps)? Indicated airspeed (KIAS) of course.
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What are the differences between a compressor wash on wing vs on test bed

I work in an aircraft engine overhaul facility and I’m trying to understand the process of compressor washing engines on Wing compared to washing them in a test bed. What process steps are different ...
kyrun Harris's user avatar
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Can the assumed temperature be lower than the flat rated temperature?

I was playing with reduced takeoff thrust in a Boeing 737-800 simulator yesterday and was surprised that I could enter assumed temperatures below the flat rated temperature of the engines. The ...
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UH1 fin under chin bubble

What is the purpose of the fin under the nose. It’s close to the co pilot side and starts at the bottom of the battery compartment and ends Near the bottom of the chin bubble. Wikipedia Photo
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What is the absolute ceiling of a 737-200?

We're trying to find the official absolute ceiling for the 737-200 for a school project. So far have only been able to maximum and service ceilings for this craft. Can anyone point us to the correct ...
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What is the precision of the Fuel Quantity Indication System (FQIS) of the Boeing 777?

What is the precision of the Boeing 777-300ER ultrasonic FQIS? If for example it is 2% when 100 tonnes of fuel are loaded, there could be anything between 98 tonnes and 102 tonnes. How is this ...
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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 ...
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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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Human powered biplane for maximum endurance

Biplanes have lower minimum power and material strength demands. However these slow planes have worse glide ratios and thus distance-based fuel consumption. Today with high performance engines and ...
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Is there a difference from alignment with the fuselage between J79 and Spey engine versions used in the F4?

Is there a difference between the J79 and Spey engine versions used in the F4 Phantom in terms of alignment with the fuselage? It looks to me like the Spey nozzles are pointing downward.
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What is the Eurofighter's altitude record?

The Eurofighter Typhoon is a pretty nimble fighter jet, and many European countries use it in their military. Its service ceiling is 65,000 ft, but what is its current altitude record from a zoom ...
Better not tell's user avatar
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Could anyone provide me with the performance charts for Boeing KC-135R Stratotanker?

I am looking for the Long Range Cruise Maximum Operating Altitude performance against the weight of the plane, all engines operating. Would be grateful if someone could point me the way.
TheNeedToRefuel's user avatar
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How can I approach analyzing the basic performance characteristics of an unknown aircraft?

I am working on a project for one of my classes. My group and I have been given information on an unknown aircraft, and we must find the max velocity, max R/C, max range, and max endurance of the ...
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What could cause a lower manifold pressure at full power after an annual?

I recently completed the annual on my E33 Bonanza. I notice on takeoff at full power that the MAP is about 1" less pressure than it was in the past at my home airport. It is also about 1.5" less ...
Overthehill 's user avatar
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How much performance penalty is incurred from a WW2-era folding wing mechanism?

I'm interested in WW2-era single-engine piston-prop monoplanes. I'm interested in the folding wing mechanisms from the perspective of performance, chiefly two things: How much extra weight does it ...
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What is the take off and landing performance of the MQ-9?

At maximum takeoff weight (listed on wikipedia as 10,494 lb (4,760 kg), 11,700 pounds (5,300 kg) with upgraded landing gear), what is the minimum runway distance required (not including safety margin) ...
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Which CS-23 airplane has the lowest takeoff speed?

Among the currently certified CS-23 airplanes (or "Part 23" in FAA-land or your personal region equivalent), which has the lowest rotation speed ($V_r$)?
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How to calculate EGT Margin for P&W engines (PW1100g) ? (Theta parameter correction)

My goal is to obtain engine baselines and calculate EGT Margin for Pratt&Whitney PW1100g engines (specifically, PW1133GA-JM) I have a large dataset of engine reports recorded during takeoff. I ...
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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 ...
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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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Why does V2 decrease for intersection takeoff

I have noticed that the VR and V2 decreases for same FLEX when departing from an intersection runway even when sufficient stop margin is available. What is the reason for this? And also does EFB ...
Udeesha Gunawardena's user avatar
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Why did this flight, that usually flies around 40,000ft only fly at around 29,000ft for the route?

Looking at the flight BY6272 BRS-PMI, it was considerably delayed and flew (according to the flight radar app) at 29,000 feet rather than its usual 40,000 for this same route. It is a Boeing 787 ...
Chris's user avatar
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Model of aircraft banked turn

I'm trying to write a model of aircraft motion during a banked turn, so for say a 60Degree roll angle constant altitude turn will require 2g lift. However to achieve this lift the aircraft has to ...
ParanoidAndroid's user avatar
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CL604/650 (or CRJ1/2) max loiter time (using it as a reference point to compare the A-10 to)

In some discussions I was having with a (back-office) USAF acquaintance about the F-35 vs. A-10 debate, the topic of loiter time came up. Wikipedia provides a 1.88 hour (112min) loiter time for the A-...
UnrecognizedFallingObject's user avatar
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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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Flight management System(FMS) related to Performance Managment

What are the recommends criteria and requirements for a Flight Management System (FMS) for transport aircraft related to Performance Database or Performance Management
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313 views

Do modern aircraft still have PCMCIA?

Do modern aircraft still have PCMCIA for engine monitoring?
Miyo Hazuki's user avatar
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269 views

How efficient would it be to have a plane with the cockpit in the back?

Would it be efficient to have a passenger planes cockpit move to the back of the plane, rather than the front? What I have in mind is cameras on the fuselage and nosecone that connects to the cockpit ...
Greenie E.'s user avatar
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612 views

How does wind affect takeoff weight limits?

Two days ago I took off from BUR in relatively windy (although dry) conditions. Flightradar showed departure from runway 33, and winds were recorded roughly mid 20s kts from the N-NNE direction. ...
Jon L's user avatar
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What variables is an engine's AFR based on?

Maybe this is a bit too technical for an aviation forum, but it specifically concerns a flight engine.(Rotax 912 iS) Road vehicle engines will probably have different behavior. As you may know, the ...
Bart's user avatar
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1 answer
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How much runway does an amphibious Cessna Caravan require for VFR part 135 operations?

I am trying to determine the length required for us to build a simple paved runway for a Cessna Grand Caravan EX Amphibian to depart for water landings and and return (VFR/VMC only, Part 135). ...
Stevo's user avatar
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1 vote
1 answer
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Is Vy closer to Vbg with a variable pitch prop

My experience with fixed pitch props is that Vy is generally higher than Vbg due to engine efficiency issues. If I set my prop pitch so optimal engine rpm is at Vbg, will Vy = Vbg?
Robert DiGiovanni's user avatar
1 vote
1 answer
183 views

Is it a common airline practice to base T/O speeds on the actual T/O weight when an assumed temp thrust is used?

Let's say the current outside air temp is 15 C and you have decided to use 50 C as the today's assumed temperature for your takeoff. In this case, use of the T/O weight the assumed temp thrust ...
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In a flat spin, does the F-16 use its rudder deflection against the rotation for recovering?

If the H-tail is used in recovery from the flat spin, is the rudder used for stopping the yaw or beta of the F-16? I know that it is surely used for inverted flat spin, but I believe that the rudder ...
George Geo's user avatar
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Why do some multi-engine aircraft have accelerate-go distance in their performance charts and some don’t?

I'm curious about why some airplanes have accelerate-stop distance (ASD) and accelerate-go distance (AGD) in their performance charts and some don’t include that. Does anyone know why?
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How do you determine VMCG, if its yawing moment by the inoperative engine is only be corrected by the rudder?

The requirement of VMCG is: VMCG, the minimum control speed on the ground, is the calibrated airspeed during the takeoff run at which, when the critical engine is suddenly made inoperative, it is ...
TRON's user avatar
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What is the effect of changing RPM on pitch attitude?

Considering a light aircraft like C172, what happens to pitch attitude of the aircraft when increasing or decreasing RPM? And more importantly why this happens?
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IDLE Factor determination

The Flight Management System (FMS) utilises the Idle Factor to modify the computation of the vertical profile whilst descending. During this phase, the FMS calculates the vertical profile and ...
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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
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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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How would I go about finding stall/loiter speed data?

I have a list of 6 fixed-wing and 2 tilt-rotor aircraft that I require the stall and loiter speeds for, however I have great trouble finding these. Is there a book or website that has an extensive ...
Daniel Giffin's user avatar
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How does fuel economy on Diamond DA62 change as passenger weight increases?

How many more gallons per hour is required to fly extra 1kg of weight on a Diamond DA62 aircraft or similar aircraft?
Arthur's user avatar
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Does does turning into the wind increase airspeed and/or climb rate?

At 5:24 to 6:10 in the video linked below, Kelsey appears to be claiming that turning into the wind tends to create 1) an increase in airspeed and 2) and an increase in climb rate. Are either of ...
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What is the lift coefficient of the B767-400ER?

Can anyone tell me what is the lift coefficient of B767-400ER please? I have searched it in Boeing website and Delta Airlines website but still couldn't find the data of the aircraft performances. ...
aviation beginner's user avatar
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What is the meaning of "Contra-Rotating Propeller Increases Efficiency"? How is it calculated?

This picture is taken from here. In that video is mentioned that contra-rotating propeller increases efficiency up to 6-16%. Regardless of the number that could be vary from one airplane to another, ...
AirCraft Lover's user avatar
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I don't quite understand the derivative in this vertical wind gust formula

First my english writing skill is still bad so pardon me if i accidentally made any mistake TT-TT. So recently I have learnt about how the vertical gust affect the load factor and the calculation ...
Harry Huynh's user avatar