Schempp-Hirth Ventus-3M Performance, Предварительное руководство по эксплуатации самолета

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SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Ventus-3M „Performance“ FLIGHT MANUAL
March 2019 CS 22
Revision – 4.5.12
4.5.12 Flight in Rain
When flying the aircraft with a wet surface or in rain, the size of the water drops
adhering to the wing causes a deterioration of its flight performance which cannot
be expressed in numerical values due to the difficulties involved with such
measurements. Often the air mass in which it´s raining is also descending so that
– compared with a wet aircraft in calm air – the sink rates encountered are even
higher.
Flight tests in rain, conducted by the manufacturer, did not reveal any significant
differences in the stalling behaviour or stalling speeds.
It cannot be excluded, however, that excessive alterations of the airfoil (as caused
by snow, ice or heavy rain) may result in higher minimum speeds.
Approach in rain: see page 4.5.7.
Caution:
The approved propellers didn’t show any defects after operation in light rain so
far.
Nevertheless, the use of the engine in rain is not recommended.