Translations:KAVAN Pilatus PC-6 Porter - Instruction manual/29/en

From KAVAN RC Wiki

For the first test flights, seek an open area of calm water. Try to avoid lakes surrounded by tall trees causing turbulence above water. Tall trees would also force a dangerously steep climb right after your model gets into the air. Choose a fine day with a gentle breeze - the take-off is easier when there are small waves than from a glass-still lake.