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What are jets (units)?

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?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?Why do fighter jets land faster than Jumbo commercial aircraft?Why must Vr be set so precisely?What units are used by western airliners?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?If maximum speed was a priority for modern military fighter jets and bombers, approximately how fast would they likely be?How does maximum speed vary with altitude?

1

$begingroup$

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 cursing speed is around 950 km/s? Or why does it equal 0.73 M, if a regular jetliner's cursing speed is 0.85 M?

airspeed units

share|improve this question

asked 1 hour ago

trejdertrejder

1,10911531

$endgroup$

add a comment | 

1

$begingroup$

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 cursing speed is around 950 km/s? Or why does it equal 0.73 M, if a regular jetliner's cursing speed is 0.85 M?

airspeed units

share|improve this question

asked 1 hour ago

trejdertrejder

1,10911531

$endgroup$

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 cursing speed is around 950 km/s? Or why does it equal 0.73 M, if a regular jetliner's cursing speed is 0.85 M?

airspeed units

share|improve this question

asked 1 hour ago

trejdertrejder

1,10911531

$endgroup$

share|improve this question

asked 1 hour ago

trejdertrejder

1,10911531

share|improve this question

asked 1 hour ago

trejdertrejder

1,10911531

asked 1 hour ago

trejdertrejder

1,10911531

asked 1 hour ago

trejdertrejder

1,10911531

2 Answers
2

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oldest

votes

4

$begingroup$

It is not a unit. It is just Microsoft trying to be funny. Or to convey an idea of the magnitude.

share|improve this answer

answered 59 mins ago

boglbogl

3,4641432

$endgroup$

add a comment | 

2

$begingroup$

480 KTAS is the typical cruising speed of wide-body airliners (unaffected by wind).

KTAS means knots true airspeed. This is different from the ground speed passengers are used to (affected by wind).

The Boeing 777 Wikipedia article lists the cruise speed as:

Cruise Mach 0.84 (482 kn; 892 km/h)

Mach number is affected by altitude if the KTAS is kept constant. Mach 0.74 is typical for narrow-body airliners (which typically have a slower cruising KTAS), e.g., a Boeing 737 Classic:

Cruise Mach 0.745 (430 kn; 796 km/h)

But like @bogl said, it's a joke, not a unit unit.

See also:

• Why is there a difference between GPS Speed and Indicator speed?


• Are we at peak speed efficiency for jet airliners at Mach 0.85?


• Why does the local speed of sound decrease with temperature and not pressure?

share|improve this answer

edited 33 mins ago

answered 48 mins ago

ymb1ymb1

66.3k7211351

$endgroup$

add a comment | 

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4

$begingroup$

It is not a unit. It is just Microsoft trying to be funny. Or to convey an idea of the magnitude.

share|improve this answer

answered 59 mins ago

boglbogl

3,4641432

$endgroup$

add a comment | 

4

$begingroup$

It is not a unit. It is just Microsoft trying to be funny. Or to convey an idea of the magnitude.

share|improve this answer

answered 59 mins ago

boglbogl

3,4641432

$endgroup$

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.

share|improve this answer

answered 59 mins ago

boglbogl

3,4641432

$endgroup$

share|improve this answer

answered 59 mins ago

boglbogl

3,4641432

answered 59 mins ago

boglbogl

3,4641432

answered 59 mins ago

boglbogl

3,4641432

2

$begingroup$

480 KTAS is the typical cruising speed of wide-body airliners (unaffected by wind).

KTAS means knots true airspeed. This is different from the ground speed passengers are used to (affected by wind).

The Boeing 777 Wikipedia article lists the cruise speed as:

Cruise Mach 0.84 (482 kn; 892 km/h)

Mach number is affected by altitude if the KTAS is kept constant. Mach 0.74 is typical for narrow-body airliners (which typically have a slower cruising KTAS), e.g., a Boeing 737 Classic:

Cruise Mach 0.745 (430 kn; 796 km/h)

But like @bogl said, it's a joke, not a unit unit.

See also:

• Why is there a difference between GPS Speed and Indicator speed?


• Are we at peak speed efficiency for jet airliners at Mach 0.85?


• Why does the local speed of sound decrease with temperature and not pressure?

share|improve this answer

edited 33 mins ago

answered 48 mins ago

ymb1ymb1

66.3k7211351

$endgroup$

add a comment | 

2

$begingroup$

480 KTAS is the typical cruising speed of wide-body airliners (unaffected by wind).

KTAS means knots true airspeed. This is different from the ground speed passengers are used to (affected by wind).

The Boeing 777 Wikipedia article lists the cruise speed as:

Cruise Mach 0.84 (482 kn; 892 km/h)

Mach number is affected by altitude if the KTAS is kept constant. Mach 0.74 is typical for narrow-body airliners (which typically have a slower cruising KTAS), e.g., a Boeing 737 Classic:

Cruise Mach 0.745 (430 kn; 796 km/h)

But like @bogl said, it's a joke, not a unit unit.

See also:

• Why is there a difference between GPS Speed and Indicator speed?


• Are we at peak speed efficiency for jet airliners at Mach 0.85?


• Why does the local speed of sound decrease with temperature and not pressure?

share|improve this answer

edited 33 mins ago

answered 48 mins ago

ymb1ymb1

66.3k7211351

$endgroup$

add a comment | 

$begingroup$

480 KTAS is the typical cruising speed of wide-body airliners (unaffected by wind).

KTAS means knots true airspeed. This is different from the ground speed passengers are used to (affected by wind).

The Boeing 777 Wikipedia article lists the cruise speed as:

Cruise Mach 0.84 (482 kn; 892 km/h)

Mach number is affected by altitude if the KTAS is kept constant. Mach 0.74 is typical for narrow-body airliners (which typically have a slower cruising KTAS), e.g., a Boeing 737 Classic:

Cruise Mach 0.745 (430 kn; 796 km/h)

But like @bogl said, it's a joke, not a unit unit.

See also:

• Why is there a difference between GPS Speed and Indicator speed?


• Are we at peak speed efficiency for jet airliners at Mach 0.85?


• Why does the local speed of sound decrease with temperature and not pressure?

share|improve this answer

edited 33 mins ago

answered 48 mins ago

ymb1ymb1

66.3k7211351

$endgroup$

share|improve this answer

edited 33 mins ago

answered 48 mins ago

ymb1ymb1

66.3k7211351

answered 48 mins ago

ymb1ymb1

66.3k7211351

answered 48 mins ago

ymb1ymb1

66.3k7211351