A C402 PLT; DEPARTING BOS; DEVIATED FROM ATC'S ASSIGNED HDG; REQUIRING THE NEXT DEP TO TAKE EVASIVE ACTION AROUND HIM.

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ON 0//TUE/02; I WAS FLYING BTWN BOSTON AND HYANNIS; AS CAPT IN THE C402. I WAS CLRED FOR TKOF FROM RWY 27; STRAIGHT OUT BEHIND AN AIRBUS; WITH THE WIND FROM ABOUT 300 DEGS. I WAS ASSIGNED RWY HDG. I TOLD THE CTLR I WAS UNABLE TO ACCEPT THIS; BECAUSE OF WAKE TURB. I TOLD HIM I WOULD NEED A SLIGHT TURN TO THE R TO AVOID THE WAKE TURB VORTICES. HE SAID HE WAS UNABLE; AND INSTRUCTED ME TO TAXI BACK IN LINE FOR DEP. THIS TIME; HE CLRED ME FOR TKOF BEHIND A B737; BUT ASKED ME HOW MUCH OF A CUT TO THE R WOULD I REQUIRE. I INFORMED HIM 'NOT MUCH; JUST 10 DEGS OR SO.' HE CLRED ME FOR TKOF AND INITIALLY ASSIGNED ME 280 DEG HDG. ON CONTACTING DEP; THEY ASSIGNED ME A 290 DEG HDG. UNFORTUNATELY FOR ME; MY ACFT WAS HVY; 8 LARGE PAX; PLUS ME; AND IT WAS A HOT AND HUMID NIGHT. THEREFORE; THE CLB RATE IN THE C402 WAS VIRTUALLY NON EXISTENT. I WAS CLBING AT AN AIRSPD OF 110 KTS (JUST SLIGHTLY ABOVE BLUE LINE); ON THAT HDG; IT DID NOT LOOK GOOD FOR CLRING THE BUILDINGS OF DOWNTOWN BOSTON. AS I NEARED THE BUILDINGS; I COULD SEE THAT I WOULD NOT BE ABLE TO MAINTAIN VFR SEPARATION STANDARDS FROM THOSE BUILDINGS. THEREFORE; I CUT BACK SLIGHTLY TO ABOUT A 275 DEG HDG TO MAINTAIN LEGAL CLRNC. I WOULD HAVE CALLED THE CTLR AND ADVISED HIM OF THIS NECESSARY DEV; BUT THERE WAS CONSTANT CHATTER ON THE RADIO; AND I NEVER COULD GET IN A WORD (IN FACT ONLY ABOUT 20 SECONDS ELAPSED BEFORE THE CTLR STARTED YELLING 'WHAT HDG ARE YOU ON;') I INFORMED HIM AT THAT TIME THAT I HAD TO TURN BACK TO A 275 DEG HDG TO AVOID THE BUILDINGS. THEY TOLD ME TO CALL THE TWR UPON LNDG IN HYANNIS; WHICH I DID WHEN I ARRIVED. I WAS THEN INFORMED BY THE TWR SUPVR THAT THEY HAD CLRED A B737 FOR DEP RIGHT BEHIND ME AND ASSIGNED THEM RWY HDG; AND THAT THEY WERE 'EATING ME UP FROM BEHIND' AND THAT THEY HAD TO TAKE EVASIVE ACTION AROUND ME. I TOLD HIM I WAS SORRY FOR THE INCONVENIENCE THIS CAUSED; BUT THAT I CERTAINLY COULD NOT FLY INTO THE BUILDINGS; AND THAT I ALSO COULD NOT SEE WHO WAS BEHIND ME; OR WHAT WAS GOING ON BEHIND ME.