Fig. 33 β ICAO equations 28 and 29 reference
Fig. 34 - Example of calculated measurement configuration of type "QNH - ICAO"
4.2.3.8 Wind component in aeronautics
Alpha-Log calculates the transverse wind component, in the tail and in the bow depending on the angle of
the landing strip relative to the North.
The formulas used are:
πΆπ = π΄π΅π(π Γ π ππ
(
π· β π·
π
)
)
π»π = π Γ πππ
(
π· β π·
π
)
ππ = π Γ πππ
(
180 + π·βπ·
π
)
where:
β’ CW = Cross Wind
β’ HW = Head Wind
β’ TW = Tail Wind
β’ V = Wind speed measured near the airstrip
β’ D = Wind direction measured near the airstrip
β’ D
r
= Orientation direction of the landing strip with direction of travel relative to the indicated angle
Consider the following aspects:
β’ The direction measured by the anemometer is conventionally referred to the origin of the wind,
while the direction of the aircraft is its destination.
β’ If Head Wind is greater than zero, it indicates presence of the wind component at the bow of the
aircraft.
β’ If Tail Wind is greater than zero, it indicates the presence of the wind component at the tail of the
aircraft.
β’ If Cross Wind is greater than zero, it indicates the presence of the transverse wind component on the
aircraft.
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