Questions tagged [temperature]

The intensity of heat found in an object or living thing.

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2
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1answer
84 views

What are the equation linking static air temperature with true airspeed & altitude?

If I want to calculate static air temperature (OAT), but I'm only given an altitude and a true airspeed. Is there such an equation that relates these principles together. I've had a look at wikipedia ...
2
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1answer
71 views

How can I calculate turbofan efficiency as a function of turbine inlet temperature?

I know that increasing the turbine inlet temperature (TIT) increases the overall efficiency of the jet engine. So I wanted to find the overall efficiency as a function of TIT. I used the equations ...
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1answer
64 views

How to compute the change in static temperature using only altitude?

I'm given an initial altitude of FL290 in ISA conditions, and the aircaft is said to climb to reach FL310. How can I use this to calculate the change in static temperature between the two flight ...
2
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1answer
159 views

Why Apollo 11 was launched in summer? (Performance question) [closed]

The question could seems stupid, but i think that best moment to launch a rocket is when temperature is lowest in order to achieve the best performance in a reaction engine. I do not know if there is ...
3
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2answers
148 views

Can an S-duct fit a turbofan exhaust instead of the intake?

Can an S-duct fit a turbofan exhaust instead of the intake? The idea here is to merge 2 exhausts into one at the exact center of the tail. This would be for twin-engine aircraft that have both engines ...
17
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2answers
3k views

What is the reason for setting flaps 1 on the ground at high temperatures?

Yesterday I've seen an A320 standing at the gate with flaps 1. While this question answers, why the flaps should be up, is there any reason to retract the flaps to 1 instead of up? In addition it ...
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3answers
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Does Nitrogen inside commercial airliner wheels prevent blowouts on touchdown?

I just watched the first episode of Inside Mighty Machine where civil engineer-turned-host, Chad Zdenek, discussed innovations of the 747. One innovation he discussed was the increased number of ...
4
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1answer
386 views

Who controls the cabin air temperature?

I understand the B737-800 has two air conditioning packs that handle the temperature of three zones: the cockpit, the fwd cabin and the aft cabin. I understand that which pack is turned on is ...
0
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1answer
482 views

What's the formula to calculate static air temperature?

What's the formula to calculate external temperature (static temperature) of an aircraft, given that I have Mach, TAS and altitude? Since I don't know the formula, I tried to search on Google. But I ...
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1answer
199 views

What is Temperture of VSI and limits of accurate value?

Within a temperature range of +50C and -20C the VSI is Accurate to within limits of : A)+- 200 ft/min B)+- 0 ft/min c)+- 75 ft/min D)+- 300 ft/min
3
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1answer
309 views

Is there an ideal air temperature for best performance in a light aircraft?

I know cold air is better for engine performance in general, colder air is also denser making lift components stronger(from what I understand). I was just wondering if there is a temperature or a ...
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1answer
842 views

Why is the relation of height and temperature different when calculating altitude?

I'm trying to grasp the essence of altitude calculations. One thing I can't figure out in my head is this: In the International Standard Atmosphere (ISA) the temperature of the air decreases with the ...
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3answers
354 views

Why is extreme cold weather a challenge at airports, since jets operate at extreme cold conditions in flight?

Wondering what specifically the issues are. Obviously, taking off and landing have more 'moving parts' but more curious about the actual extreme cold. I assume the operating temperatures at cruise ...
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1answer
326 views

What is the standard temperature used in this true altitude equation?

The control tower of a certain airport with true altitude of 2000ft informs the pilot that QNH is 900hPa and the temperature at the airport is -10 degrees Celsius. The airplane is at FL300 (vertically ...
1
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1answer
859 views

Why do brushless motors heat up? [closed]

I would like to know what makes a brushless motor heat up. I'm aware of the problems generating the high temperature such as wire contact problems or overloaded motors. I want to know what makes a ...
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0answers
70 views

What is the operating temperarature of a scram jet at its theoretical maximum speed?

What is the operating temperature of a scram jet at its theoretical maximum speed of Mach 24? For those with access to a simulator and do such simulators exist and are they possible? Given this ...
4
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1answer
187 views

Where is the mistake in this air density calculation?

I intend to compute the air density, $\rho$ at an altitude of $h=15000ft=4572m$, with an ISA deviation of $\Delta_{ISA}=18^{\circ} F=10\,K$. Well I first computed the real temperature of the air at $...
1
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1answer
420 views

When temperature increases what happens to the air molecules and aircraft while landing and takeoff during hot weather? [closed]

Just out of curiosity on a hot weather with temperature increases what happens to the air molecules and aircraft during landing and takeoff?
5
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2answers
4k views

How to calculate outside air temperature at a certain altitude?

I am a PPL student and working on the cross-country planning. Let's say the OAT is -13º @ 6000', how to calculate the OAT @ 7000'?
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0answers
76 views

Temperature of airplane while flying? [duplicate]

When the air-plane reaches to the altitude of about 12,000 m or so, the airplane's outside cover is very cold due to the air temperature or very hot due to the friction? Or it depends on different ...
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2answers
270 views

Can heat from the engine inlet be used to produce thrust?

As the engine inlet temperature increases, Is more heat energy provided by air? if yes then can we utilize that heat energy to produce more thrust?
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1answer
764 views

Does an increase in inlet temperature affect fuel flow and power output?

The fuel flow rate decreases as the inlet temperature of the air entering the engine increases. Will the engine produce same amount of power as when the fuel flow was higher?
40
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2answers
12k views

Can commercial airliners fly over central Antarctica during winter?

For example, if an airline decided they wanted to run year round flights on the great circle from Perth to Buenos Aires with a commercial airliner (e.g. A380 or B747), would they be able to do so? Or ...
2
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1answer
283 views

Are there typical values of pitot-static and TAT probe measurement uncertainties?

I'm working on flight sensors for a project and I'm supposed to model noise in the Static Port, Pitot tube, and TAT probe measurements. I looked a lot for it online and could not get a convincing ...
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1answer
722 views

Am I correctly calculating the density altitude?

I came across the following question while studying for the FAA PPL written test: Determine the density altitude for these conditions: Altimeter setting: 30.35 Runway temperature: +25°F ...
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1answer
174 views

Why do different aircraft have different maximum operating temperatures?

I was reading this Wired article about the recent Phoenix heat grounding some jets. It's a great read on why heat is detrimental to lift, but it raises a point it never answers (emphasis mine) ...
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4answers
10k views

Is there a maximum or minimum temperature for take-off and landing?

Is there a maximum or minimum temperature that a plane can take off or land at?
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0answers
95 views

What is the temperature at the center of a gas turbine disc?

I realize that it varies with the temperature at the inlet of the turbine, materials, dimensions, etc. But I would be interested in knowing an orientative value. For example, for a turbine which has ...
4
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1answer
2k views

What is the temperature of the air leaving the combustion chamber of a CFM56-5C?

What is the temperature of the air leaving the combustion chamber of a CFM56-5C? I was wondering as I could only find out that the fuel burns at around 1500 Celsius but this can't be the same as the ...
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1answer
4k views

What is the relationship between temperature, dew point and the formation of clouds?

What can you infer from the temperature / dew point values in this METAR? EGJG 121630Z 09012KT 9999 SCT006 15/14 Q1015 I understand the temperature is 15 degrees and the dew point is 14, and I ...
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1answer
3k views

Why can't Norwegian's Boeing 787 operate from Vegas during hot weather?

In a German news article it was stated that the additional weight (Norwegian puts 291 passengers on their 787-8) leads to operations restrictions in Las Vegas when temperature conditions exceed 40°C. ...
4
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2answers
244 views

Can the ECS work in an unpressurized cabin?

Can you control the cabin temperature if the cabin is unpressurized? What if the "cabin" isn't really that big, like a fighter aircraft? For example, could I cruise in comfort at 20,000 ft in an ...
3
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1answer
453 views

Is airframe heating a concern at subsonic speeds?

It is a well-established fact that airframe and skin heating due to air friction is a significant concern with supersonic aircraft. However, below Mach 1 (i.e. typical commercial aircraft flights ...
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2answers
5k views

How can OAT and SAT differ?

From YouTube. I always thought SAT (Static Air Temperature) and OAT (Outside Air Temperature) were the same thing. So does this answer, so does Wikipedia: [The] outside air temperature (OAT) or ...
6
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1answer
1k views

What is the fuel temperature in the tanks during a flight?

I'm trying to estimate the temperature of fuel stored in wing tanks during the flight. In my situation, I'm considering two wing tanks of 2000 liters each, one on each wing, at 20°C before the flight ...
9
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2answers
528 views

Is it legal to fly GA aircraft in temperatures above what is shown on the performance charts?

Most Cessna aircraft have performance charts the range from 0 to 40 Celsius. I've had a CFI tell me that the FARs prohibit flight if the OAT exceeds 40C or whatever is shown on the performance charts. ...
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2answers
570 views

How do pilots calculate the temperature to put Into the FMS for an FLX takeoff?

I recently read an article about derated takeoffs and I understand the concept, but how do pilots know what temperature to put into their FMS if they want an FLX takeoff? Some people say it's a rough ...
21
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7answers
5k views

What sort of issues related to extreme heat (115°F, 46°C plus) would prevent takeoffs or landings?

I recently flew into and out of McCarran Airport Las Vegas (LAS) and a local told me that they never report the air temperature at the airport above 115°F (46°C) because the FAA does not allow ...
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1answer
3k views

Why are min and max temperatures (TN TX) not published in TAFs in the United States?

I know that other countries like Brazil, Argentina, etc. do publish minimum and maximum temperatures in their Terminal Aerodrome Forecasts, abbreviated TN and TX. But why are they not shown in TAFs in ...
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1answer
1k views

Do jet engine exhausts usually glow orange?

In these two lovely images: Source: Wikimedia Commons Source: wvi.com The exhaust end of the engines are glowing bright orange from being so hot. Do they get that hot during normal flight ...
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1answer
263 views

Why is the combustion temperature in a turbojet engine kept low?

Why the temperature of hot gas entering the turbine is maintained far below the adiabatic combustion temperature?
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1answer
612 views

Can heated air be provided in the cabin in commercial airlines?

Having travelled quite a number of times, there are times, when the cabin becomes a bit too cold, or people with certain condition get shivering quickly. In such circumstances and generally, is it ...
9
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3answers
15k views

Cargo aircraft temperature [duplicate]

What is the temperature in the storage compartment on board of a cargo aircraft? I'm ordering a temperature-sensitive package by airmail and wouldn't want it to freeze. There are many questions ...
6
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1answer
250 views

What is the temperature of intake air at several speed of sound intervals from 1x to 10x?

I watched a YouTube movie about Reaction Engines development of the Sabre engine which main feature is cooling intake air. However, I cannot find an overview of the temperature of intake air at ...
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3answers
4k views

How do fast-flying aircraft avoid overheating?

As a follow-up question to What is the typical temperature of an airliner's hull during flight? I wonder how very fast airplanes, such as the SR-71 mentioned, avoid overheating with a total air ...
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2answers
10k views

What is the typical temperature of an airliner's hull during flight?

Some high-speed military aircraft like the SR-71 had real heating problems, but airliners also travel almost at the speed of sound, use most of their fuel to make up for frictional losses, so I would ...
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3answers
8k views

What effect does cold weather have on helicopter performance?

Recently I was flying around my RC helicopter on a 40 $^\circ$F (4$^\circ$C). At some point in the flight the rotor just stopped moving in mid-air and then I regained control back at ground level. I ...
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1answer
19k views

What appears on EGT Gauge if the mixture is rich or lean?

I have some questions on interpreting Exhaust Gas Temperature (EGT) readings. Can you give me some input on: What appears on EGT Gauge if the mixture is lean or rich? what is the normal range, ...
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1answer
765 views

How does EGT work? [closed]

I am making a report and how does EGT of an aircraft, either turbo or piston engine, work? Can you please give me the procedures... Like where it starts and being transferred to where and stuff. Thank ...
20
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1answer
5k views

How are temperature differences handled in a jet engine?

Given the graph in this answer, the temperature are quite high inside a jet-engine, even greater that many metal's melting point. I understand high core temperature are efficient. A jet engine is ...