Questions tagged [units]

For questions regarding units of measurement used in aviation

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In what units is the Thrust-to-Weight ratio expressed?

is it correct to say the units for T/W is s^2/m? This is what I did: T/W= s/ft * ftlb/s * s^2/lbft
Charles's user avatar
4 votes
2 answers

On what basis is the weight unit of the FQIS selected by airlines of various countries?

On what basis is the weight unit of the FQIS (Fuel Quantity Indicating System) selected by airlines of various countries? Does it depend on the local country for using imperial or metric units?
Emerson's user avatar
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1 vote
1 answer

What units should use for velocity prediction equations?

I'm not an expert aviation but I'm designing my own RC Plane and I wanted to estimate the maximum velocity using equations (15-20) from this paper. Honestly, I am not quite sure on the units to use ...
Ahmed Abdulla's user avatar
33 votes
11 answers

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....
Pierre Chevallier's user avatar
2 votes
1 answer

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 ...
Bianfable's user avatar
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20 votes
2 answers

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 ...
trejder's user avatar
  • 4,162
1 vote
4 answers

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 ...
AirCraft Lover's user avatar
4 votes
2 answers

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 ...
rational-pi's user avatar
1 vote
1 answer

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?
Ken - Enough about Monica's user avatar
5 votes
1 answer

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 ...
kkakkurt's user avatar
  • 283
5 votes
2 answers

Does the US military use metric system?

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 ...
Zaz's user avatar
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0 votes
2 answers

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 ...
Antzi's user avatar
  • 4,192
6 votes
2 answers

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 ...
alex25's user avatar
  • 409
9 votes
2 answers

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 ...
kevin's user avatar
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2 votes
1 answer

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 ...
mins's user avatar
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22 votes
3 answers

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 ...
NitinG's user avatar
  • 6,879