C310 CHARTER PLT LOST CTL OF ACFT IN CLR AIR WHILE CIRCUMNAVING TSTMS WHEN TURB AND WINDSHEAR SUDDENLY ROLLED THE ACFT INVERTED AND IT WENT INTO A VERT DIVE. FULL RECOVERY WAS AFFECTED AT 200 FT ABOVE THE WATER.

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I WAS FLYING A CHARTER FROM NAPLES; FL; TO TALLAHASSEE; FL. I FILED A DVFR FLT PLAN SO I COULD FLY W AROUND SOME TSTMS. AT ABOUT 50-80 MI N OF TAMPA; AROUND THE CRYSTAL RIVER AREA; I WAS AT 6500 FT MSL VFR; ABOUT 10-15 MI OUT OVER THE WATER. I HIT SEVERE TURB AND/OR WINDSHEAR. I WAS IMMEDIATELY ASKING CTR FOR VECTOR OR DIFFERENT ALTS. I GOT 1 BIG JOLT OF TURB AND THE SECOND WAVE ROLLED MY PLANE OVER AND OUT OF CTL. I PULLED PWR BACK TO 20 KTS ABOVE MANEUVERING SPD (VA) IN CASE OF WIND GUST THAT COULD BRING PLANE LOWER THAN VA. THE PLANE FELT LIKE IT ROLLED ON ITS BACK AND DID A WING-OVER BEFORE FALLING STRAIGHT DOWN TOWARD GND. I FOUGHT TO KEEP WINGS LEVEL AND ONCE THEY WERE LEVEL AND WE WERE FALLING; I CHOPPED THE PWR TO KEEP FROM EXCEEDING YELLOW LINE AND STRESSING THE PLANE. I PULLED BACK ON THE YOKE SOME AND HELD CONTINUOUS PRESSURE TRYING NOT TO STRESS PLANE AND APPLIED UP TRIM TO HELP HOLD THE PRESSURE. AT 4000 FT MSL THE ANGLE WE WERE FALLING WAS NOT AS BAD -- 2000 FT MSL SOMEWHAT TRYING TO FLY OUT; AND AT 1000-500 FT MSL THE AIRPLANE WAS ALMOST LEVEL AND FLYING AGAIN. I REGAINED FULL CTL OF ACFT ABOUT 200-300 FT MSL AGAIN. NO DAMAGE; EXCEPT FOR 2 WINDOWS THAT BLEW OUT. I DECLARED AN EMER FINALLY; AS THE WINDOWS BLEW IN THE DSCNT. MY HEADSET WENT OUT THE WINDOW TOO. ZJX GAVE ME AN IMMEDIATE VECTOR TO CRYSTAL RIVER ARPT WHERE WE LANDED SAFELY. I PRAISE THE GUY AT ZJX THAT I WAS TALKING TO. HE GAVE ME GOOD VECTORS; WX IN THE AREA AND MOST IMPORTANTLY; ONCE I REGAINED CTL OF THE PLANE; HELPED ME FIGURE OUT WHERE I WAS. WHEN THE WINDOWS BLEW; I LOST MY HEADSETS; CHARTS; AND GPS. I WAS DEAD RECKONING. I TURNED E 090 DEGS TOWARD LAND AND HE GAVE ME A 085 DEG HDG TO CRYSTAL RIVER. NOW I KNOW ABOUT TURB AND WINDSHEAR. IT COMES OUT OF NOWHERE. ONE MIN THE FLT IS SMOOTH; AND THE NEXT WE ARE FALLING TO THE EARTH. GLAD TO BE ON THE GND.