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Questions tagged [units]

For questions regarding units of measurement used in aviation

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30
votes
10answers
10k views

How could “aggressor” pilots fly foreign aircraft without speaking the language?

Context I watched a couple documentaries recently and found one where they were mentioning the training of American forces against Mi-24 that were captured and brought back to the US to test fly them....
2
votes
1answer
80 views

How much does the horizontal stabilizer on a 737 move for one unit of trim?

Inspired by this question, what exactly is the meaning of a stab trim unit? Is it exactly one degree of stabilizer movement? The 737 NG FCOMv2 (9.20.9 Flight Controls - System Description) only lists ...
20
votes
2answers
3k views

What is a jet (unit) shown in Windows 10 calculator? [closed]

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 ...
1
vote
4answers
765 views

What is the official unit of airplane/aviation speed?

Some units I read/found are commonly used in aviation: mach, knot (nautical mile per hour), mile per hour (mph), kilometer per hour (km/h or kph). "Official" meaning like the units used by the flight ...
3
votes
2answers
202 views

How to compare two SFCs, one in thrust, the other in power (both turbofans)?

I want to compare some recent turbofan engines in terms of fuel efficiency, particularly the PW535A and FJ44-4. I found the SFC for the PW535A to be 0.44 lb/h/lbf. I couldn't find anything on the ...
1
vote
1answer
395 views

What is the unit for ground speed reported by ADS-B?

Strangely enough, I'm having trouble finding the unit reported by ADS-B on the Internet. Many sites simply refer to it as "ground speed". Is it measured in KPH?
5
votes
1answer
483 views

What is the distance unit on a navigation display?

I want to learn what is the distance unit on a navigation display. I pointed the distance marks with red circles on the navigation display. What are these 10, 15 etc. values' unit? Are they ...
3
votes
2answers
1k views

Does the US military use metric?

Does the US military use the metric system for aviation? For example, does it use: feet or meters for altitude? nautical miles or kilometers for distance? knots or km/h for speed? inHg or hPa for ...
0
votes
2answers
217 views

What units are used by western airliners? [duplicate]

Many different units can be used to designate the same things. Degrees Celsius va Fahrenheit Altitude in feets or meters, ... Sometime different units measure the same thing but have different ...
6
votes
2answers
777 views

Does the Cessna POH state the fuel consumption in Imperial or US Gallons?

I'm planning a trip in a Cessna 182T and was calculating fuel requirements and started wondering. I have always assumed that fuel consumption is in US Gallons (or 3.785 litres) but I can't find a ...
9
votes
2answers
3k views

How do pilots manage metric altitude?

A minority of the world, specifically Russia and China, uses the metric system in aviation. ATC will tell the pilots to "climb to 900 meters height". How do pilots of international flights manage ...
2
votes
1answer
679 views

Still using knots, nautical miles, inches of Hg. Is that impossible to switch to SI units? [duplicate]

Why doesn't the aviation industry use SI units?. I believe only a few countries use meters and other SI units in air transportation, including India and China (please correct if wrong). Using kts ...
22
votes
3answers
6k views

Do we have a unit to measure turbulence?

Do airplanes have any way to quantify the turbulence like if shakes are there or the some kind of air drift is happening every parameter of these have some units but do collectively there is any such ...