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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1answer
105 views

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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121 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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356 views

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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547 views

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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60 views

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 ...
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1answer
806 views

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 ...
2
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1answer
111 views

Optimizing the airplane for best cruising altitude and velocity

In the conceptual phase of the design, I am optimizing various entities of an airplane for the best cruising altitude and speed to reduce the cost, which also includes MTOW and fuel weight. Consider a ...
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0answers
95 views

How much thrust does the Lilium aircraft produce?

I have been researching the Lilium aircraft and can’t find information about thrust. An early version of this aircraft was 2 seats with a loaded weight of 1,400 lbs, 36 ducted fans and 320 kW peak ...
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85 views

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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265 views

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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279 views

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 ...
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306 views

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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225 views

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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63 views

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-...
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71 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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172 views

Why does drag coefficient decrease with Mach number in the supersonic regime?

I'm trying to understand why the drag coefficient decreases in the supersonic regime with Mach number. While it is easy show this using supersonic, potential flow theory, I'm looking for a more ...
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33 views

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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153 views

Carpet Plots for Aircraft Sizing

Generally, Carpet Plots are constructed to find out an optimal design which will satisfy all the performance needs and is least in weight & cost. I want to know how to construct a carpet plot? I ...
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184 views

Do modern aircraft still have PCMCIA?

Do modern aircraft still have PCMCIA for engine monitoring?
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209 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 ...
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200 views

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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201 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. ...
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235 views

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 ...
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1answer
222 views

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). ...
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1answer
211 views

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?
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1answer
158 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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1answer
392 views

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 ...
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2answers
696 views

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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1answer
45 views

Aircraft thrust calculation

I had a question regarding thrust calculation for an aircraft during cruise. For an aircraft flying at a constant cruise altitude and a constant Mach number (level unaccelerated flight), what exactly ...
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48 views

Ceiling parameter Derivation

I read the absolute ceiling of an adequately powered airplane is determined by the formula, $\frac{W}{S} = \frac{1.4}{2} p M^2 CL$ Where, $W/S =$ Wing Loading $M =$ Mach Number $CL =$ Lift Coefficient ...
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67 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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41 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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34 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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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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45 views

What is the engine shell temperature?

What are the highest temperature locations in the outer shell on an aircraft engine? Particularly, modern turbofans like the Trent 900 for example. I'm interested in the temperature constraints of ...
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64 views

How can we find maximum lift coefficient of Airfoil?

I am trying to find the maximum Lift coefficient for airfoil NACA 64A-404. I chose this airfoil for wing. I am stuck at finding the Clmax. I tried to use javafoil but javafoil is showing Cl less than ...
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2answers
971 views

How to compute thrust to weight ratio of a Cessna 172?

Cessna 172 has weight about 1 ton and it's engine produces about 213 Kg of thrust, and it flies great. So if I make a plane with a weight of 100kg including pilot and fuel so will 15 kg thrust good ...
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28 views

VLM at High Speeds and High Angle of Attack

I want to analyze a plane of the size and speed of a commercial jetliner. I have made the model of it on OpenVSP. I am using VSPAero's Vortice Lattice Method for the same. I want to analyze the plane ...
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41 views

What is the general trend of payload fraction for an RC propeller plane?

What is the general trend of payload vs total weight for a radio controlled propeller aircraft? I am simply using this formula: $$Wo = \frac{Wpayload}{(1-((We/Wo)+(Wp/Wo)))}$$ I could get We/Wo (...
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53 views

How to choose airfoil for High Subsonic small UAV?

I am trying to make a concept for a small UAV. The UAV shall be flying at Mach=0.75 , shortly 0.9 For this, I am looking for an adequate airfoil, which allows me, to avoid Mach=1 on the airfoil. From ...
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124 views

How does the maneuverability of the FJ-2 Fury and F-86 compare?

The North American FJ-2 Fury was the US Navy version of the F-86 Sabre jet. I want to know if G maneuver limits were in favor of the F-86 or the FJ-2 Fury.
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Boeing 757-200 Fuel Burn

So up front, I'm aware of the high number of aircraft and environmental factors and how oversimplified my request is. After all, there is a reason that the aircraft manufacturers provide charts to ...
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Is there a fixed ratio between highest L/D and max endurance L/D?

It can be demonstrated that, for any airplane, there is a fixed ratio between the maximum range and maximum endurance speeds (1.31607...). Does another, fixed ratio exist between highest L/D and L/D ...
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200 views

What's the effect of air density and temperature in the range of aspirated reciprocating-engine airplanes?

Reciprocating engines give more power with less revs when the aspirated air has a higher density. Wings also give the same lift at less airspeed when the air has a higher density. Drag is higher, too.....
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1answer
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What is the cruise altitude of the Beechcraft Model 18?

I'm trying to find the cruise altitude of the Beechcraft Model 18 (S, Super H18 or any variant), or the range of altitude for such aircraft.
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Do the F-16's leading edge flaps lock up at +2° when the aircraft as a whole is supersonic, or when the airflow over its wings is supersonic?

My question is: do the leading edge flaps lock upright when the aircraft as a whole is supersonic, or when airflow over wings of the aircraft is supersonic?
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1answer
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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&...