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Boris might not have an ounce of common sense but...
A brief toe dipping into the sea of UK General Aviation for pilots of single engine piston aircraft:
Vertical measurements – Altitude, height above ground, cloud base, clearances etc are all in feet, however horizontal measurements are not – Visibility is in metres and distance between two points is in nautical miles. A nm is one minute (1/60 of a degree) of latitude however this changes and so it’s 1852 metres which is 1.151 ordinary/statute miles.
Pressure is in hectopascals where 1hPa is exactly equal to 1 millibar.
You buy fuel priced in Litres but if you fly a US manufactured aircraft (e.g. Piper) the fuel/consumption figures are in US Gallons (not the same as UK Gallons). However before you can fly you need to know the weight of the total fuel (and all people & baggage) in pounds. To get the weight in lbs you need to convert the total fuel volume back into L because the specific gravity of the fuel is in Kg/L which gives the weight in Kg which you then need to convert to lbs to ensure both the weight and the centre of gravity is within limits as specified by the US manufacturer.
After this the actual volume is replaced in your head by endurance anyway – full tanks will last a known number of hours.
Oil is measured in Quarts but I have no idea how much that is – It’s just notches on a dipstick.
And a Radar mile is 12.35 µs (cos it measures there and back).
But I discovered nothing else but depraved, excessive superstition. Pliny the younger
You buy fuel priced in Litres but if you fly a US manufactured aircraft (e.g. Piper) the fuel/consumption figures are in US Gallons (not the same as UK Gallons). However before you can fly you need to know the weight of the total fuel (and all people & baggage) in pounds. To get the weight in lbs you need to convert the total fuel volume back into L because the specific gravity of the fuel is in Kg/L which gives the weight in Kg which you then need to convert to lbs to ensure both the weight and the centre of gravity is within limits as specified by the US manufacturer.
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