Accident Details
A private certificated pilot was conducting a personal flight under Title 14, CFR Part 91, performing a glassy water takeoff toward the west from a lake in a float-equipped airplane. The pilot reported variable winds from the north.
During the takeoff, the pilot lifted the left float out of the water, then the right float at 45 mph, and began a climb at 55 mph. When the airplane reached about 50 feet, it began a "very fast uncommanded roll to the right, and control forces went to zero." The pilot indicated there was no mechanical malfunction or failure, and the engine was producing power during the accident sequence.
The airplane descended toward the water, and the right wing and right float assembly struck the water, causing the airplane to overturn. The pilot and passenger were both wearing inflatable jackets and exited the airplane.
Post-Accident Examination
An FAA airworthiness inspector examined the airplane as it sat on a trailer, after the pilot recovered and partially disassembled the airplane. The inspector reported that the airplane's flap handle was set at 10 degrees. The inspector did not indicate that he observed any mechanical malfunction.
Weather Information
A METAR from the accident site reported calm winds and a temperature of 72 degrees F.