BUNNELL, Fla. (AP) _ An experimental helicopter-like aircraft known as a gyroplane lost power and clipped several trees before it crashed and burst into flames on Tuesday, killing two men on board.

Bill Parsons, 69, a pilot and innovator in the field of gyroplanes, was killed instantly when the craft went down about 5:45 p.m. at Flagler County Airport.

His passenger, Robert Lynn Scott, 72, of Flagler Beach, died a short while later.

Flagler County Airport Manager Brian Cooper said they had been flying most of the afternoon around the airport. The gyro appeared to have engine trouble just before the crash, he said.

``They had a new design of rotor blade, and they may have been testing it out,'' Cooper said.

Called the ``Guru of Gyros,'' Parsons has built hundreds of the gyroplanes.