SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Arcus M
FLIGHT MANUAL
4.5.8
Flight in rain
a) Power plant retracted:
When flying the “Arcus M” with a wet surface or in rain, the water drops
adhering to the wings cause 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 containing the
moisture is also descending so that - compared with a wet powered
sailplane in calm air - the sink rates encountered are 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 4.5.4
b) Power plant extended, engine running:
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.
October 2011
Revision --
appr. 4.5.8