What is a jet (unit) shown in Windows 10 calculator? [on hold]Are we at peak speed efficiency for jet...
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What is a jet (unit) shown in Windows 10 calculator? [on hold]
Are we at peak speed efficiency for jet airliners at Mach 0.85?Why is there a difference between GPS Speed and Indicator speed?Why does the local speed of sound decrease with temperature and not pressure?What protection does Vno provide?Still using knots, nautical miles, inches of Hg. Is that impossible to switch to SI units?What is the actual air speed over and under a wing due to Bernoulli's Principle?Is there a difference in aerodynamic efficiency between single engine and twin engine airplanes?What prevents a Machmeter from being the standard airspeed indicator?How does an ADIRU convert ram air pressure from the Pitot tube into Airspeed?How an Engine thrust changes with airspeed? Why?What's going on with sudden acceleration/deceleration in mid-air?How does maximum speed vary with altitude?What is the official unit of airplane/aviation speed?
$begingroup$
From Windows 10's calculator:
What is a "jet" (physical unit)?
And why does it equal 480 knots or 888,88 km/h, if a jetliner's cruising speed is around 950 km/s? Or why does it equal 0.73 M, if a regular jetliner's cruising speed is 0.85 M?
airspeed units
edited 13 hours ago
ymb1
66.4k7211353
asked 16 hours ago
trejdertrejder
1,17711534
$endgroup$
put on hold as off-topic by fooot, xxavier, Ralph J, David Richerby, Pondlife 2 hours ago
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question does not appear to be about aviation, within the scope defined in the help center." – fooot, xxavier, Ralph J, David Richerby, Pondlife
If this question can be reworded to fit the rules in the help center, please edit the question.
add a comment |
$begingroup$
From Windows 10's calculator:
What is a "jet" (physical unit)?
And why does it equal 480 knots or 888,88 km/h, if a jetliner's cruising speed is around 950 km/s? Or why does it equal 0.73 M, if a regular jetliner's cruising speed is 0.85 M?
airspeed units
edited 13 hours ago
ymb1
66.4k7211353
asked 16 hours ago
trejdertrejder
1,17711534
$endgroup$
put on hold as off-topic by fooot, xxavier, Ralph J, David Richerby, Pondlife 2 hours ago
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question does not appear to be about aviation, within the scope defined in the help center." – fooot, xxavier, Ralph J, David Richerby, Pondlife
If this question can be reworded to fit the rules in the help center, please edit the question.
5
$begingroup$
+1 for cursing speed stated in km/s. That's actually plausible.
$endgroup$
– Harper
13 hours ago
3
$begingroup$
I think "950 km/s" is a typo; surely the jet isn't moving at 950 kilometers each second.
$endgroup$
– Greg Schmit
9 hours ago
3
$begingroup$
Laden or unladen?
$endgroup$
– Dennis Williamson
7 hours ago
2
$begingroup$
European or African?
$endgroup$
– IconDaemon
4 hours ago
add a comment |
$begingroup$
From Windows 10's calculator:
What is a "jet" (physical unit)?
And why does it equal 480 knots or 888,88 km/h, if a jetliner's cruising speed is around 950 km/s? Or why does it equal 0.73 M, if a regular jetliner's cruising speed is 0.85 M?
airspeed units
edited 13 hours ago
ymb1
66.4k7211353
asked 16 hours ago
trejdertrejder
1,17711534
$endgroup$
From Windows 10's calculator:
What is a "jet" (physical unit)?
And why does it equal 480 knots or 888,88 km/h, if a jetliner's cruising speed is around 950 km/s? Or why does it equal 0.73 M, if a regular jetliner's cruising speed is 0.85 M?
airspeed units
airspeed units
edited 13 hours ago
ymb1
66.4k7211353
asked 16 hours ago
trejdertrejder
1,17711534
edited 13 hours ago
ymb1
66.4k7211353
asked 16 hours ago
trejdertrejder
1,17711534
edited 13 hours ago
ymb1
66.4k7211353
edited 13 hours ago
ymb1
66.4k7211353
edited 13 hours ago
ymb1
66.4k7211353
66.4k7211353
asked 16 hours ago
trejdertrejder
1,17711534
asked 16 hours ago
trejdertrejder
1,17711534
asked 16 hours ago
trejdertrejder
1,17711534
1,17711534
put on hold as off-topic by fooot, xxavier, Ralph J, David Richerby, Pondlife 2 hours ago
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question does not appear to be about aviation, within the scope defined in the help center." – fooot, xxavier, Ralph J, David Richerby, Pondlife
If this question can be reworded to fit the rules in the help center, please edit the question.
put on hold as off-topic by fooot, xxavier, Ralph J, David Richerby, Pondlife 2 hours ago
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question does not appear to be about aviation, within the scope defined in the help center." – fooot, xxavier, Ralph J, David Richerby, Pondlife
If this question can be reworded to fit the rules in the help center, please edit the question.
5
$begingroup$
+1 for cursing speed stated in km/s. That's actually plausible.
$endgroup$
– Harper
13 hours ago
3
$begingroup$
I think "950 km/s" is a typo; surely the jet isn't moving at 950 kilometers each second.
$endgroup$
– Greg Schmit
9 hours ago
3
$begingroup$
Laden or unladen?
$endgroup$
– Dennis Williamson
7 hours ago
2
$begingroup$
European or African?
$endgroup$
– IconDaemon
4 hours ago
add a comment |
5
$begingroup$
+1 for cursing speed stated in km/s. That's actually plausible.
$endgroup$
– Harper
13 hours ago
3
$begingroup$
I think "950 km/s" is a typo; surely the jet isn't moving at 950 kilometers each second.
$endgroup$
– Greg Schmit
9 hours ago
3
$begingroup$
Laden or unladen?
$endgroup$
– Dennis Williamson
7 hours ago
2
$begingroup$
European or African?
$endgroup$
– IconDaemon
4 hours ago
5
5
$begingroup$
+1 for cursing speed stated in km/s. That's actually plausible.
$endgroup$
– Harper
13 hours ago
$begingroup$
+1 for cursing speed stated in km/s. That's actually plausible.
$endgroup$
– Harper
13 hours ago
3
3
$begingroup$
I think "950 km/s" is a typo; surely the jet isn't moving at 950 kilometers each second.
$endgroup$
– Greg Schmit
9 hours ago
$begingroup$
I think "950 km/s" is a typo; surely the jet isn't moving at 950 kilometers each second.
$endgroup$
– Greg Schmit
9 hours ago
3
3
$begingroup$
Laden or unladen?
$endgroup$
– Dennis Williamson
7 hours ago
$begingroup$
Laden or unladen?
$endgroup$
– Dennis Williamson
7 hours ago
2
2
$begingroup$
European or African?
$endgroup$
– IconDaemon
4 hours ago
$begingroup$
European or African?
$endgroup$
– IconDaemon
4 hours ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
It is not a unit. It is just Microsoft trying to be funny. Or to convey an idea of the magnitude.
answered 15 hours ago
boglbogl
3,6741533
$endgroup$
13
$begingroup$
It just needs Clippy™ waving itself around for complete & utter uselessness.
$endgroup$
– FreeMan
9 hours ago
5
$begingroup$
@FreeMan - It almost does - look at the Length setting - for small numbers it gives you the units in "paperclips".
$endgroup$
– Darrel Hoffman
8 hours ago
3
$begingroup$
@DarrelHoffman ugh... I was kidding!!!
$endgroup$
– FreeMan
8 hours ago
add a comment |
$begingroup$
Why does it equal 480 knots?
480 KTAS is the typical cruising speed of wide-body jetliners. KTAS means knots true airspeed (unaffected by wind). This is different from the ground speed passengers are used to (affected by wind).
Jet (unit) is not a standard unit as @bogl pointed out.
For example, the Boeing 777 Wikipedia article lists the cruise speed as:
Cruise Mach 0.84 (482 kn; 892 km/h)
Why does it equal Mach 0.73?
The speed of sound at 20°C is 343 m/s, and 480 knots is 247 m/s, so the Mach number (a ratio) is ~0.73. The higher you go, the colder it gets, and the slower the local speed of sound becomes, that's how 480 knots can end up being Mach 0.85 for jetliners.
See also:
- Why is there a difference between GPS Speed and Indicator speed?
- Why does the local speed of sound decrease with temperature and not pressure?
answered 15 hours ago
ymb1ymb1
66.4k7211353
$endgroup$
4
$begingroup$
Note also that since the speed of sound depends on altitude (higher altitude = lower temperature = lower speed of sound), and the Mach number is a fraction of the "local" speed of sound, the speed corresponding to a given Mach number will differ according to altitude. Microsoft is probably giving Mach numbers in terms of the speed of sound at sea level, not in terms of the speed of sound at 10,000 m.
$endgroup$
– Michael Seifert
14 hours ago
1
$begingroup$
@MichaelSeifert I think that was just the OP who converted it to Mach number at sea level, not Microsoft. The screenshot in the question doesn't show Mach number (likely for exactly the reason that it does vary with altitude and there are enough geeky people at Microsoft to know that.)
$endgroup$
– reirab
10 hours ago
2
$begingroup$
@reirab, yes, the screenshot does include Mach number. It is the first of the small numbers.
$endgroup$
– Jan Hudec
9 hours ago
$begingroup$
@JanHudec Ah, yes, you're right. Somehow I missed it when I looked at it before.
$endgroup$
– reirab
8 hours ago
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
It is not a unit. It is just Microsoft trying to be funny. Or to convey an idea of the magnitude.
answered 15 hours ago
boglbogl
3,6741533
$endgroup$
13
$begingroup$
It just needs Clippy™ waving itself around for complete & utter uselessness.
$endgroup$
– FreeMan
9 hours ago
5
$begingroup$
@FreeMan - It almost does - look at the Length setting - for small numbers it gives you the units in "paperclips".
$endgroup$
– Darrel Hoffman
8 hours ago
3
$begingroup$
@DarrelHoffman ugh... I was kidding!!!
$endgroup$
– FreeMan
8 hours ago
add a comment |
$begingroup$
It is not a unit. It is just Microsoft trying to be funny. Or to convey an idea of the magnitude.
answered 15 hours ago
boglbogl
3,6741533
$endgroup$
13
$begingroup$
It just needs Clippy™ waving itself around for complete & utter uselessness.
$endgroup$
– FreeMan
9 hours ago
5
$begingroup$
@FreeMan - It almost does - look at the Length setting - for small numbers it gives you the units in "paperclips".
$endgroup$
– Darrel Hoffman
8 hours ago
3
$begingroup$
@DarrelHoffman ugh... I was kidding!!!
$endgroup$
– FreeMan
8 hours ago
add a comment |
$begingroup$
It is not a unit. It is just Microsoft trying to be funny. Or to convey an idea of the magnitude.
answered 15 hours ago
boglbogl
3,6741533
$endgroup$
It is not a unit. It is just Microsoft trying to be funny. Or to convey an idea of the magnitude.
answered 15 hours ago
boglbogl
3,6741533
answered 15 hours ago
boglbogl
3,6741533
answered 15 hours ago
boglbogl
3,6741533
answered 15 hours ago
boglbogl
3,6741533
3,6741533
13
$begingroup$
It just needs Clippy™ waving itself around for complete & utter uselessness.
$endgroup$
– FreeMan
9 hours ago
5
$begingroup$
@FreeMan - It almost does - look at the Length setting - for small numbers it gives you the units in "paperclips".
$endgroup$
– Darrel Hoffman
8 hours ago
3
$begingroup$
@DarrelHoffman ugh... I was kidding!!!
$endgroup$
– FreeMan
8 hours ago
add a comment |
13
$begingroup$
It just needs Clippy™ waving itself around for complete & utter uselessness.
$endgroup$
– FreeMan
9 hours ago
5
$begingroup$
@FreeMan - It almost does - look at the Length setting - for small numbers it gives you the units in "paperclips".
$endgroup$
– Darrel Hoffman
8 hours ago
3
$begingroup$
@DarrelHoffman ugh... I was kidding!!!
$endgroup$
– FreeMan
8 hours ago
13
13
$begingroup$
It just needs Clippy™ waving itself around for complete & utter uselessness.
$endgroup$
– FreeMan
9 hours ago
$begingroup$
It just needs Clippy™ waving itself around for complete & utter uselessness.
$endgroup$
– FreeMan
9 hours ago
5
5
$begingroup$
@FreeMan - It almost does - look at the Length setting - for small numbers it gives you the units in "paperclips".
$endgroup$
– Darrel Hoffman
8 hours ago
$begingroup$
@FreeMan - It almost does - look at the Length setting - for small numbers it gives you the units in "paperclips".
$endgroup$
– Darrel Hoffman
8 hours ago
3
3
$begingroup$
@DarrelHoffman ugh... I was kidding!!!
$endgroup$
– FreeMan
8 hours ago
$begingroup$
@DarrelHoffman ugh... I was kidding!!!
$endgroup$
– FreeMan
8 hours ago
add a comment |
$begingroup$
Why does it equal 480 knots?
480 KTAS is the typical cruising speed of wide-body jetliners. KTAS means knots true airspeed (unaffected by wind). This is different from the ground speed passengers are used to (affected by wind).
Jet (unit) is not a standard unit as @bogl pointed out.
For example, the Boeing 777 Wikipedia article lists the cruise speed as:
Cruise Mach 0.84 (482 kn; 892 km/h)
Why does it equal Mach 0.73?
The speed of sound at 20°C is 343 m/s, and 480 knots is 247 m/s, so the Mach number (a ratio) is ~0.73. The higher you go, the colder it gets, and the slower the local speed of sound becomes, that's how 480 knots can end up being Mach 0.85 for jetliners.
See also:
- Why is there a difference between GPS Speed and Indicator speed?
- Why does the local speed of sound decrease with temperature and not pressure?
answered 15 hours ago
ymb1ymb1
66.4k7211353
$endgroup$
4
$begingroup$
Note also that since the speed of sound depends on altitude (higher altitude = lower temperature = lower speed of sound), and the Mach number is a fraction of the "local" speed of sound, the speed corresponding to a given Mach number will differ according to altitude. Microsoft is probably giving Mach numbers in terms of the speed of sound at sea level, not in terms of the speed of sound at 10,000 m.
$endgroup$
– Michael Seifert
14 hours ago
1
$begingroup$
@MichaelSeifert I think that was just the OP who converted it to Mach number at sea level, not Microsoft. The screenshot in the question doesn't show Mach number (likely for exactly the reason that it does vary with altitude and there are enough geeky people at Microsoft to know that.)
$endgroup$
– reirab
10 hours ago
2
$begingroup$
@reirab, yes, the screenshot does include Mach number. It is the first of the small numbers.
$endgroup$
– Jan Hudec
9 hours ago
$begingroup$
@JanHudec Ah, yes, you're right. Somehow I missed it when I looked at it before.
$endgroup$
– reirab
8 hours ago
add a comment |
$begingroup$
Why does it equal 480 knots?
480 KTAS is the typical cruising speed of wide-body jetliners. KTAS means knots true airspeed (unaffected by wind). This is different from the ground speed passengers are used to (affected by wind).
Jet (unit) is not a standard unit as @bogl pointed out.
For example, the Boeing 777 Wikipedia article lists the cruise speed as:
Cruise Mach 0.84 (482 kn; 892 km/h)
Why does it equal Mach 0.73?
The speed of sound at 20°C is 343 m/s, and 480 knots is 247 m/s, so the Mach number (a ratio) is ~0.73. The higher you go, the colder it gets, and the slower the local speed of sound becomes, that's how 480 knots can end up being Mach 0.85 for jetliners.
See also:
- Why is there a difference between GPS Speed and Indicator speed?
- Why does the local speed of sound decrease with temperature and not pressure?
answered 15 hours ago
ymb1ymb1
66.4k7211353
$endgroup$
4
$begingroup$
Note also that since the speed of sound depends on altitude (higher altitude = lower temperature = lower speed of sound), and the Mach number is a fraction of the "local" speed of sound, the speed corresponding to a given Mach number will differ according to altitude. Microsoft is probably giving Mach numbers in terms of the speed of sound at sea level, not in terms of the speed of sound at 10,000 m.
$endgroup$
– Michael Seifert
14 hours ago
1
$begingroup$
@MichaelSeifert I think that was just the OP who converted it to Mach number at sea level, not Microsoft. The screenshot in the question doesn't show Mach number (likely for exactly the reason that it does vary with altitude and there are enough geeky people at Microsoft to know that.)
$endgroup$
– reirab
10 hours ago
2
$begingroup$
@reirab, yes, the screenshot does include Mach number. It is the first of the small numbers.
$endgroup$
– Jan Hudec
9 hours ago
$begingroup$
@JanHudec Ah, yes, you're right. Somehow I missed it when I looked at it before.
$endgroup$
– reirab
8 hours ago
add a comment |
$begingroup$
Why does it equal 480 knots?
480 KTAS is the typical cruising speed of wide-body jetliners. KTAS means knots true airspeed (unaffected by wind). This is different from the ground speed passengers are used to (affected by wind).
Jet (unit) is not a standard unit as @bogl pointed out.
For example, the Boeing 777 Wikipedia article lists the cruise speed as:
Cruise Mach 0.84 (482 kn; 892 km/h)
Why does it equal Mach 0.73?
The speed of sound at 20°C is 343 m/s, and 480 knots is 247 m/s, so the Mach number (a ratio) is ~0.73. The higher you go, the colder it gets, and the slower the local speed of sound becomes, that's how 480 knots can end up being Mach 0.85 for jetliners.
See also:
- Why is there a difference between GPS Speed and Indicator speed?
- Why does the local speed of sound decrease with temperature and not pressure?
answered 15 hours ago
ymb1ymb1
66.4k7211353
$endgroup$
Why does it equal 480 knots?
480 KTAS is the typical cruising speed of wide-body jetliners. KTAS means knots true airspeed (unaffected by wind). This is different from the ground speed passengers are used to (affected by wind).
Jet (unit) is not a standard unit as @bogl pointed out.
For example, the Boeing 777 Wikipedia article lists the cruise speed as:
Cruise Mach 0.84 (482 kn; 892 km/h)
Why does it equal Mach 0.73?
The speed of sound at 20°C is 343 m/s, and 480 knots is 247 m/s, so the Mach number (a ratio) is ~0.73. The higher you go, the colder it gets, and the slower the local speed of sound becomes, that's how 480 knots can end up being Mach 0.85 for jetliners.
See also:
- Why is there a difference between GPS Speed and Indicator speed?
- Why does the local speed of sound decrease with temperature and not pressure?
answered 15 hours ago
ymb1ymb1
66.4k7211353
edited 6 hours ago
answered 15 hours ago
ymb1ymb1
66.4k7211353
answered 15 hours ago
ymb1ymb1
66.4k7211353
answered 15 hours ago
ymb1ymb1
66.4k7211353
66.4k7211353
4
$begingroup$
Note also that since the speed of sound depends on altitude (higher altitude = lower temperature = lower speed of sound), and the Mach number is a fraction of the "local" speed of sound, the speed corresponding to a given Mach number will differ according to altitude. Microsoft is probably giving Mach numbers in terms of the speed of sound at sea level, not in terms of the speed of sound at 10,000 m.
$endgroup$
– Michael Seifert
14 hours ago
1
$begingroup$
@MichaelSeifert I think that was just the OP who converted it to Mach number at sea level, not Microsoft. The screenshot in the question doesn't show Mach number (likely for exactly the reason that it does vary with altitude and there are enough geeky people at Microsoft to know that.)
$endgroup$
– reirab
10 hours ago
2
$begingroup$
@reirab, yes, the screenshot does include Mach number. It is the first of the small numbers.
$endgroup$
– Jan Hudec
9 hours ago
$begingroup$
@JanHudec Ah, yes, you're right. Somehow I missed it when I looked at it before.
$endgroup$
– reirab
8 hours ago
add a comment |
4
$begingroup$
Note also that since the speed of sound depends on altitude (higher altitude = lower temperature = lower speed of sound), and the Mach number is a fraction of the "local" speed of sound, the speed corresponding to a given Mach number will differ according to altitude. Microsoft is probably giving Mach numbers in terms of the speed of sound at sea level, not in terms of the speed of sound at 10,000 m.
$endgroup$
– Michael Seifert
14 hours ago
1
$begingroup$
@MichaelSeifert I think that was just the OP who converted it to Mach number at sea level, not Microsoft. The screenshot in the question doesn't show Mach number (likely for exactly the reason that it does vary with altitude and there are enough geeky people at Microsoft to know that.)
$endgroup$
– reirab
10 hours ago
2
$begingroup$
@reirab, yes, the screenshot does include Mach number. It is the first of the small numbers.
$endgroup$
– Jan Hudec
9 hours ago
$begingroup$
@JanHudec Ah, yes, you're right. Somehow I missed it when I looked at it before.
$endgroup$
– reirab
8 hours ago
4
4
$begingroup$
Note also that since the speed of sound depends on altitude (higher altitude = lower temperature = lower speed of sound), and the Mach number is a fraction of the "local" speed of sound, the speed corresponding to a given Mach number will differ according to altitude. Microsoft is probably giving Mach numbers in terms of the speed of sound at sea level, not in terms of the speed of sound at 10,000 m.
$endgroup$
– Michael Seifert
14 hours ago
$begingroup$
Note also that since the speed of sound depends on altitude (higher altitude = lower temperature = lower speed of sound), and the Mach number is a fraction of the "local" speed of sound, the speed corresponding to a given Mach number will differ according to altitude. Microsoft is probably giving Mach numbers in terms of the speed of sound at sea level, not in terms of the speed of sound at 10,000 m.
$endgroup$
– Michael Seifert
14 hours ago
1
1
$begingroup$
@MichaelSeifert I think that was just the OP who converted it to Mach number at sea level, not Microsoft. The screenshot in the question doesn't show Mach number (likely for exactly the reason that it does vary with altitude and there are enough geeky people at Microsoft to know that.)
$endgroup$
– reirab
10 hours ago
$begingroup$
@MichaelSeifert I think that was just the OP who converted it to Mach number at sea level, not Microsoft. The screenshot in the question doesn't show Mach number (likely for exactly the reason that it does vary with altitude and there are enough geeky people at Microsoft to know that.)
$endgroup$
– reirab
10 hours ago
2
2
$begingroup$
@reirab, yes, the screenshot does include Mach number. It is the first of the small numbers.
$endgroup$
– Jan Hudec
9 hours ago
$begingroup$
@reirab, yes, the screenshot does include Mach number. It is the first of the small numbers.
$endgroup$
– Jan Hudec
9 hours ago
$begingroup$
@JanHudec Ah, yes, you're right. Somehow I missed it when I looked at it before.
$endgroup$
– reirab
8 hours ago
$begingroup$
@JanHudec Ah, yes, you're right. Somehow I missed it when I looked at it before.
$endgroup$
– reirab
8 hours ago
add a comment |
5
$begingroup$
+1 for cursing speed stated in km/s. That's actually plausible.
$endgroup$
– Harper
13 hours ago
3
$begingroup$
I think "950 km/s" is a typo; surely the jet isn't moving at 950 kilometers each second.
$endgroup$
– Greg Schmit
9 hours ago
3
$begingroup$
Laden or unladen?
$endgroup$
– Dennis Williamson
7 hours ago
2
$begingroup$
European or African?
$endgroup$
– IconDaemon
4 hours ago