What was found
AFTER LEVELING OUT FROM TAKE-OFF FROM KSAT TO HOUSTON THE LOW RPM WARNING LIGHT WITH AUDIO STARTED GOING OFF. I VERIFIED THE WARNING BY OBSERVING ROTOR RPMS BELOW 95% ON THE TRIPLE TACH. I IMMEDIATELY REDUCED POWER RESULTING IN LITTLE EFFECT ON THE RPMS. I CONTACTED KSAT TOWER TO RETURN TO THE AIRPORT. BEING IN A NEW AIRCRAFT AT AN UNFAMILIAR AIRPORT I DECLARED AN EMERGENCY TO BE ABLE TO MANEUVER SAFELY AS NEEDED. ONCE AT A HOVER RPM'S STABILIZED IN THE APPROPRIATE RANGE WITH NO INDICATION OF FAILURE AND I RETURNED TO THE SKY CARE HANGAR