What was found
AFTER DEPARTING RUNWAY 35L AT MCO, INSTRUCTED TO TURN TO A WEST HEADING & MAINTAIN 8000 FT. LEVELED OFF & STARTED ACCELERATING TO 250 KNOTS. PASSING THROUGH 230 KNOTS FELT AN UNUSUAL FLUTTER IN YOKE & TAIL. SLOWED A/C DOWN & TOLD TO CLIMB. AGAIN PASSING THROUGH 240 SEEMED WORSE. CONTACTED ATC FOR ABOUT A MINUTE & CONTINUOUSLY BLOCKED BY OTHER AIRCRAFT. EMERGENCY DECLARED. DURING DESCENT, FLUTTER FELT AGAIN & SPEED ABOUT 220 KNOTS & SLOWING. ACRFT LANDED WITHOUT INCIDENT & TAXIED BACK TO GATE. MX PERFORMED INSPECTION OF FLT CONTROLS & FOUND NO DISCREPANCIES. PERFORMED ELEVATOR CABLE TENSION CHK IAW EMB 135 27-31-01. OPS CHK GOOD. TENSION CHK OF ELEVATOR GOOD IAW EMB 135 AMM 27-21-1. NO DEFECTS NOTED.