Overview
A float plane, operated by a flight instructor (CFI) and a student pilot, struck an embankment during an aborted takeoff. The CFI had decided to demonstrate a no-flap takeoff in calm/glassy water conditions. The aircraft accelerated to approximately 55 to 60 knots but did not become airborne, prompting the instructor to abort the maneuver.
Sequence of Events
After aborting, the CFI attempted a left turn. The float plane settled off step, but the forward momentum caused the aircraft to continue straight ahead. The instructor called for "rudders," meaning the water rudders, but the student interpreted the command as normal rudder and assisted in applying that control. The water rudder handle was located at the lower left corner of the instrument panel, which was not accessible to the CFI, who was seated in the right seat.
Following the miscommunication, the float plane impacted an embankment. The engine had been shut down by that time, and the estimated impact speed was between 7 and 10 knots.
Aftermath
The CFI later stated that he should have called for "water rudders" instead of simply "rudders" to avoid confusion. The accident investigation did not provide a formal probable cause statement.