GVC Meteorology for Commercial UAS 2

Question 1

What is the significance of the 'dew point' for UAS operations?

Accepted Answer

When temperature approaches the dew point, fog, mist, or low cloud may form, reducing visibility

Answer

It indicates the maximum altitude for safe flight

Answer

It measures the wind speed at ground level

Answer

It only affects flights conducted over water

Question 2

What is the Beaufort Scale and how is it useful for UAS pilots?

Accepted Answer

A scale that classifies wind speed based on observable effects on the environment, useful for estimating conditions on site

Answer

A scale measuring air pressure changes

Answer

A scale measuring UV radiation intensity

Answer

A scale used only by maritime operations

Question 3

Why are 'thermals' a concern for UAS operations, particularly over urban areas?

Accepted Answer

Thermals are rising columns of warm air that can cause sudden altitude gains and turbulence, affecting UAS stability

Answer

Thermals only occur over oceans

Answer

Thermals improve battery performance

Answer

Thermals are only relevant for manned glider operations

Question 4

At what wind speed (as a general guideline) should most small commercial UAS operations be suspended?

Accepted Answer

When sustained winds exceed approximately two-thirds of the UAS maximum airspeed

Answer

Any wind above 5 knots

Answer

Only when winds exceed 50 knots

Answer

Wind speed limits only apply in controlled airspace

Question 5

What is the 'lapse rate' and why does it matter for UAS operations?

Accepted Answer

The rate at which air temperature decreases with altitude, affecting density altitude and UAS performance

Answer

The rate at which a drone loses battery power

Answer

The rate at which daylight decreases in winter

Answer

The rate at which a NOTAM expires

Question 6

How does high density altitude affect UAS performance?

Accepted Answer

It reduces air density, decreasing propeller thrust and degrading UAS performance

Answer

It improves motor efficiency and increases flight time

Answer

It has no effect on multirotor aircraft

Answer

It only affects fixed-wing UAS