LSI LASTEM Alpha-Log, Руководство пользователя

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Alpha-Log – User manual
LSI LASTEM SRL INSTUM_03388 Page 71 / 116
Fig. 33 – 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:
𝐶𝑊 = 𝐴𝐵𝑆(𝑉 × 𝑠𝑖𝑛(𝐷 − 𝐷
𝑟
))
𝐻𝑊 = 𝑉 × 𝑐𝑜𝑠(𝐷 − 𝐷
𝑟
)
𝑇𝑊 = 𝑉 × 𝑐𝑜𝑠(180 + 𝐷−𝐷
𝑟
)
where:
•
CW = Cross Wind
•
HW = Head Wind
•
TW = Tail Wind
•
V = Wind speed measured near the airstrip
•
D = Wind direction measured near the airstrip
•
D
r
= Orientation direction of the landing strip with direction of travel relative to the indicated angle
Consider the following aspects:
•
The direction measured by the anemometer is conventionally referred to the origin of the wind,
while the direction of the aircraft is its destination .
•
If Head Wind is greater than zero, it indicates presence of the wind component at the bow of the
aircraft.
•
If Tail Wind is greater than zero, it indicates the presence of the wind component at the tail of the
aircraft.
•
If Cross Wind is greater than zero, it indicates the presence of the transverse wind component on the
aircraft.