Accident Sequence
During a takeoff from a lake, the pilot extended the flaps to 20 degrees, beyond the manufacturer's recommended setting of 10 degrees. The airplane lifted off near the midpoint of the lake. As the airplane climbed to about 20 feet above the water, the stall horn activated. The pilot realized the airplane would not clear the trees along the shoreline. He turned the airplane to the left and reduced engine power for an intended landing while in the turn. The left wing subsequently stalled, causing the airplane to pitch down as it rolled left. The left wingtip, followed by the corresponding float and then the fuselage, struck the water. After coming to rest, the airplane sank.
Pilot Report
The pilot reported that the manufacturer recommends one notch, or 10 degrees, of flaps for takeoff. When questioned about the flap setting used, the pilot stated he had used 20 degrees. The pilot described the stall horn sounding continuously as the airplane flew at low altitude. The decision to turn and reduce power was made to avoid the trees, but the maneuver led to an aerodynamic stall.
Examination
No examination details were provided in the source. The airplane was not recovered due to sinking. No further information is available regarding damage or injuries.