ATX X HELI HAD NMAC WITH ACR Y IN ARPT TFC PATTERN. SEE AND AVOID CONCEPT.

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ATX X ENTERING DOWNWIND LEG OF TFC PATTERN FOR R TFC; N LNDG; A COMMUTER AIRPLANE LNDG ON RWY 19 CROSSED FROM MY L; REAR; ABOVE; TO MY R AND BELOW AS HE MANEUVERED FOR LNDG. SINCE HE APCHED FROM BEHIND AND OVERTOOK ME; I DID NOT SEE HIM UNTIL HE HAD PASSED OVER AND SLIGHTLY TO MY R. THERE WAS NO TIME FOR EVASIVE ACTION ON MY PART AS HE WAS PAST ME; OR PASSING; WHEN I SAW HIM. I HAD CALLED THE TWR SEVERAL MINS EARLIER; PRIOR TO ENTERING THE ATA. THE ACR Y CALLED INITIALLY SHORTLY AFTER MY FIRST CALL. WE WERE BOTH INBOUND FROM THE NE. HIS FIRST CALL PLACED HIM ABOUT 6 MI BEHIND ME. HE HAD REQUESTED RWY 19 AND WAS TOLD TO RPT 2 DME. I WAS TOLD TO RPT PASSING ABEAM OF THE WILDWOOD NDB. SHORTLY AFTER HIS 2 DME CALL; ATC STATED TO ME; 'THE ACR Y APPEARS TO BE XING ABOVE AND IN FRONT OF YOU'. I RESPONDED THAT I WAS JUST COMING ABEAM OF THE NDB AND LOOKING. I DID NOT SEE HIM UNTIL HE HAD CROSSED OVER ME. NO OTHER ATC CALLS PERTINENT TO OUR SITUATION WERE MADE. AFTER THE ACR Y HAD LANDED; I ASKED THE PLT IF HE HAD SEEN ME; AS I WAS STILL ON THE DOWNWIND LEG OF MY APCH; ON TWR FREQ. HE REPLIED 'NEGATIVE.' AT NO TIME DID ATC ATTEMPT TO VERIFY THAT THE ACR Y HAD ME IN SIGHT. I FEEL IT IS IMPORTANT THAT AN OVERTAKING ACFT MUST BE MADE AWARE OF ANY ACFT HE IS OVERTAKING AS THE SLOWER ACFT CANNOT MANEUVER TO AVOID TFC HE CANNOT SEE.