RedactedNarrative: VI OPERATOR WAS ACCELERATING TO PLANE WHEN VI STARTED NOT OPERATE CORRECTLY AND NOT GETTING ENOUGH POWER.  SMOKE BEGAN COMING FROM ENGINE.  OPERATOR LET OFF THROTTLE AND OPENED ENGINE COMPARTMENT SEEING SMOKE AND A SMALL FIRE.   ALL ON BOARD FIRE EXTINGUISHERS WERE USED WITH A FIFTH GOTTEN FROM A NEARBY VESSEL.  FIRE DEPARTMENT CALLED OUT TO MAKE SURE WAS EXTINGUSHED.  PFD WERE USED. UNKNOWN IF USED BEFORE FIRE.  ALCOHOL NOT A FACTOR.