Questions tagged [temperature]

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

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2 answers
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Confused about this Pressure Altitude vs True Altitude Question

The standard question on a knowledge test: "Under which condition will pressure altitude be equal to true altitude?" The answer is: "when atmospheric conditions exist, i.e., 29.92" ...
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1 answer
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How to calculate the TAT (total air temperature) when a rocket is flying to space? [closed]

I checked this answer and I used the formula this answerer provided, but I couldn't get the data he/she presented in the graph. Did I do something wrong?
4 votes
1 answer
147 views

Is the ISA still up to date?

The Standard Atmosphere dates back to 1962 when Earth was colder. The 1976 update didn't make changes within 50 km altitude (the tropo- and stratosphere). It assumes 15°C at sea level, decreases until ...
3 votes
3 answers
155 views

Does a plane's service ceiling vary with season/temperature?

Aircraft use barometric altitude, e.g. FL300 is the barometric altitude of 30,000 ft MSL. In winter however, FL300 is actually lower than the absolute altitude of 30,000 ft because of a cold and ...
0 votes
1 answer
95 views

Cessna 182Q (parachute operation) - climb leaning with CHT

for a 182Q the POH specifies for maximum climb to use 2400 RPM and full power with given speeds (78 KIAS for Sea Level, reducing to 72 at FL100). It specifies that the mixture may be leaned at 5000ft ...
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2 answers
119 views

Temperature profile for a boundary layer

So I was reading the textbook today, and I see this picture for the temperature profile through the boundary layer. And I was confused on why the shape looks like this? Should it not look more like ...
22 votes
5 answers
4k views

Would building a large asphalt square or painted dark black area create a "thermal generator" for glider use?

Imagine if you build a "parking lot" square of asphalt and paint it the deepest black possible to absorb maximum heat...would that spot essentially be a thermal generator that you could fly ...
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3 votes
1 answer
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Will a jet flown on a parabolic arc reach its highest altitude on a warm day or a cold one?

In level flight, on cold days jet-powered planes can fly higher because the air is denser. However, at the same time the true airspeed is lower because of the denser air. At warmer temperatures a ...
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3 votes
3 answers
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How do jet engines cool the gas in the combustion zone?

The adiabatic flame temperature of kerosene in air is 2093 C (source). Modern jet engines have a turbine inlet temperature (TIT) of 1700 to 1800 C. This is the max acceptable temperature before the ...
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8 votes
6 answers
727 views

If absolutely nothing changes except temperature, does indicated altitude increase, decrease, or stay the same?

I have gotten conflicting answers from CFI's on this one. In bold are the only things that changed or would potentially change. Initially: Aircraft is parked at a very dry (to factor out humidity) ...
6 votes
2 answers
900 views

How much aerodynamic heating do jetliners endure?

At cruise altitude (~ 33,000 ft) and cruise airspeed (~ 500 mph) how much do present-day airliners heat up due to air friction during their journey? Probably not much because there's still ice on the ...
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4 answers
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Why doesn't temperature affect Pressure Altitude?

In this picture: it states the tops and bottoms of the 3 columns of air have the same pressure. This explains the error in altitude indications given in a non-standard temperature. Pressure only ...
1 vote
0 answers
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What is a typical fuel temperature entering the burner for different mission flight points of a civil aircraft?

Is there a target regarding the fuel temperature that enters the turbine engine's combustion chamber and if so does it change with different operation flight points in civil aircraft applications? Is ...
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1 vote
1 answer
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What is a typical range of air temperature used for engine inlet cowl anti icing?

So i was searching the internet for engine inlet cowl anti icing and found that usually compressor bleed air is used to prevent the ice formation in several parts of the aircraft. I am mainly ...
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1 vote
1 answer
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Why does the CRJ100/200’s FMS miscalculate temperatures at altitudes in excess of 36k feet?

The CRJ100/200’s flight management system (FMS) apparently is not to be used to calculate engine thrust settings when the aircraft’s altitude exceeds 36,000 feet, due to internal calculation errors at ...
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2 votes
3 answers
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What weather should we expect when temperature and dew point are similar?

What should i expect during my flight planning when i see both temperature and dew point are the same? I understand there will be fog but what else? could it mean icing? any difference between 20/20 ...
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2 answers
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What is the relationship between fuel mixture, throttle setting and engine temperature?

I'm trying to understand the relationship between mixture, throttle, and engine temp. In this article from AOPA, it states ... a lean mixture of 16 to 1 is not going to burn as hot as a rich mixture ...
2 votes
1 answer
470 views

In a B737 NG, when a TO is flown with an Assumed Temperature N1, is the subsequent CLB N1 also adjusted (lowered) accordingly?

The Title is my question. Because I think that if one uses a very high Assumed Temperature, the subsequent Max CLB N1 maybe higher that the TO N1.
1 vote
2 answers
317 views

How can I work out Sea Level Pressure from QNH?

I am a little confused, is the QNH the current pressure at Sea Level? Therefore putting it into the altimeter will give your current altitude on the ground in pressure altitude relative to current sea ...
2 votes
2 answers
114 views

What do these temperature data listed in the EASA Type Certificate Data Sheet mean?

Could you tell me what is the Maximum Permissible Indicated Turbine Temperature (ITT) and the ambient limit temperature for sea level static thrust?
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2 answers
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What can cause the engine temperature to be high in piston engines?

What can cause the engine temperature to be high in piston engine aircraft?
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6 votes
2 answers
2k views

Flex temperature isn't actually "fooling" the FADEC, right?

I'll be using Airbus terminology here because that's what I know, but I guess the concepts are universally applicable. The way I understand flex temperature is: It's a user interface for pilots to ...
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1 vote
1 answer
178 views

What is the speed above which painting an aircraft black (or dark) results in lower skin temperature?

The Concorde is painted white for thermal reasons. If I understand correctly, it is done to reflect as much radiation as possible in order to lower tempereture. But when the skin is really hot (SR-71, ...
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2 votes
1 answer
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How hot is supersonic intake air?

How hot is the air at the compressor inlet at supersonic speed? For instance the Concorde at mach 2.2 or other jet engines at even higher speeds.
1 vote
0 answers
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What happens to the dynamic temperature in the boundary layer at supersonic speed?

In the boundary layer for a supersonic flow, does the dynamic temp decrease? Thank you
6 votes
1 answer
388 views

Why does the temperature rise in the boundary layer after a shock wave?

Is it because the BL thickens after the shock so the drag increases, causing a increased friction? Here M=0.82 far from the airfoil, the picture represents the static temperature in Kelvins around the ...
11 votes
3 answers
8k views

How hot do internal parts of jet engine get?

How hot does a jet engine get? I'm interested in the temperature of the parts, not of the exhaust or combustion. If you took temperature of an engine after a flight across the Pacific Ocean what are ...
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1 answer
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How do airports in hot climates handle extremely high temperatures?

In June 2017 dozens of flights were cancelled in Phoenix, Arizona because of temperatures exceeding 120 degrees Fahrenheit/48.9 degrees Celsius.1,2 Hot air at a given air pressure is less dense, ...
5 votes
3 answers
2k views

If you depressurize an aircraft at FL340, will the temperature inside fall to match the temperature outside?

Assuming you’d have an oxygen mask on before hand, and you depressurized the aircraft at FL340, would the inside and outside temperatures quickly become the same?
9 votes
3 answers
3k views

How does latitude affect the air temperature at 8 km altitude where planes fly?

Is the air temperature (at 8km) above the North or South poles colder than the same altitude above the equator? Why? Ground level air temperature difference between coldest and warmest places on ...
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2 answers
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Why and how do atmospheric properties sometimes vary from the ISA? [closed]

I'm curious as to why sometimes atmospheric properties don't match the ISA's. One reason I am considering is due to calibration discrepancies. By atmospheric properties I mean temperature, Density, ...
2 votes
1 answer
495 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 votes
1 answer
505 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 ...
0 votes
1 answer
242 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 votes
1 answer
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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 votes
2 answers
325 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 ...
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16 votes
2 answers
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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 ...
12 votes
3 answers
3k views

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 ...
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1 answer
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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 votes
1 answer
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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 ...
-1 votes
1 answer
483 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 votes
1 answer
476 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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1 answer
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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 ...
8 votes
3 answers
441 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 ...
1 vote
1 answer
562 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 vote
1 answer
1k 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 ...
2 votes
0 answers
95 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 votes
1 answer
290 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 vote
1 answer
757 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?
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2 answers
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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'?