NMAC AT LTT FLIES THROUGH UNCTLED FIELD AIRSPACE WITH NO COM.

Narrative

AN LTT WAS FLYING OPPOSITE DIRECTION. IT HAD CANCELLED ADVISORIES SEVERAL MINS PRIOR. IT THEN FLEW OVER BAR HARBOR ARPT WITHOUT TALKING ON UNICOM. THIS ARPT IS VERY BUSY DURING SUMMER AND FALL MONTHS. AN SMA A ON FINAL TO RWY 4 TRIED TO REACH THE LTT ON UNICOM. IF IT HADN'T BEEN FOR THIS CALL; I WOULD NOT HAVE KNOWN THE LTT WAS IN THE AREA. BASED ON THE CALL FROM THE SMA A TO THIS LTT I STARTED A DSCNT. THE LTT TRANSITED THE AREA AT 1500-2000 AGL WITHOUT EVEN TALKING ON UNICOM. AT THE TIME THEY WERE 3 SMAS; A GLIDER; AND AN LTT B ALL WITHIN 5 MI OF THE ARPT. I WOULD LIKE TO SEE A PUBLISHED RECOMMENDATION FOR FLT AROUND BAR HARBOR/ARCADIA NATL PARK. AT THE TIME I WAS COMPLETING A SCENIC FLT AROUND THE ISLAND WITH 3 PAX. I HAD ON BOTH ROTATING BEACON STROBES AND LNDG LIGHTS. FOR THE PAST 50 YRS PEOPLE HAVE BEEN FLYING AROUND THE ISLAND IN A CLOCKWISE MANNER AND THIS HAS BECOME ACCEPTED PRACTICE IN THE AREA. BOTH THE LTT AND AN SMA C FLEW AROUND THE ISLAND IN A COUNTER CLOCKWISE MANNER THAT DAY. I MET THE SMA C ON THE OPPOSITE SIDE OF THE ISLAND EARLIER IN THE DAY (100 FT VERT 300 HORIZ). NEAR MISS. THE SMA C WAS MONITORING UNICOM AT THE TIME AND I INFORMED HIM OF THE ACCEPTED PRACTICE OF FLYING CLOCKWISE AROUND THE ISLAND AT THAT TIME. IN THIS TYPE OF FLYING ALL ACFT TEND TO SEEK THE LOWEST ALT THAT IS SMOOTH FOR THEIR SIGHTSEEING ACTIVITIES. THIS PUTS OPPOSITE DIRECTION ACFT IN DIRECT CONFLICT AROUND THE EDGES OF ARCADIA NATL PARK. ON THIS DAY THAT ALT WAS 1400 FT MSL. EVERY YEAR FOR THE PAST 5 YRS I HAVE HAD AT LEAST 2 SUCH INCIDENTS DURING THE SUMMER AND FALL SEASON.