On August 25, 1994, at 1520 eastern daylight time, a Grumman G-44, N1471N, impacted the water during takeoff from Madaket Harbor, Nantucket, Massachusetts. The pilot received minor injuries. The amphibian airplane was substantially damaged. Visual meteorological conditions prevailed at the time of the accident. The flight was conducted under 14 CFR Part 91. The pilot reported that the takeoff began without incident. He stated, "Transition to the step was smooth...Once on the step there was no indication of engine trouble or control problems. Just prior to lifting off the water, out of the corner of my left eye, I spotted some contrary water what looked to be to me some kind of swell and decided to pull the power, but before I could do so, the plane veered extremely to the right. Attempts to level the plane with opposite aileron was not responsive." The pilot stated that he "...pulled the power back..." and "...was able to keep the plane from rolling completely over." He stated the airplane's left side of the nose impacted the water and the airplane nosed over. Post accident examination of the airframe and engines did not reveal any anomalies.