NMAC BETWEEN DEPARTING ACR-LTT AND DEPARTING SMA.

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CLRED FOR TKOF RWY 28; ALB. F/O WAS MAKING THE TKOF WHILE I MONITORED THE INSTRUMENTS. I WAS ON THE GAUGES TILL THE GEAR AND FLAPS WERE RETRACTED APPROX 200' ALT. IT WAS THEN I BEGAN A VISUAL SCAN AND SAW THE SMA Y ON A CONVERGING COURSE 200-300' OFF OUR 10 O'CLOCK POS. I IMMEDIATELY TOLD THE F/O TO BREAK RIGHT AND THE SMA APPEARED TO TURN LEFT. MY F/O NEVER SAW THE SMA DUE TO HIS POS IN THE ACFT AND THE DECK ANGLE. THE SMA WAS ISSUED A TKOF CLRNC 20 SECS PRIOR TO US WITH A 280 DEG HDG ASSIGNED. EVIDENTLY HE DID NOT FLY THE INITIAL HDG AS 280 DEGS WOULD PUT HIM S OF THE 28 DEP COURSE. WIND AT THE TIME WAS WNW AT 10 KTS. I'VE ENCLOSED THE ARPT DIAGRAM AND NEITHER THE TWR NOR THE HELIPAD ARE VISIBLE FROM THE END (DEP) OF RWY 28. TWR SHOULD HAVE OBSERVED MORE CLOSELY THE DEP PATH OF THE SMA Y AND THE SMA Y SHOULD HAVE ADHERED TO HIS DEP INSTRUCTIONS TO PREVENT SUCH AN INCIDENT. NO WARNING/ADVISORY OF EITHER ACFT TO THE OTHER WAS HEARD; BUT THIS IS A HIGH WORKLOAD PORTION OF FLT AND WE MAY HAVE MISSED IT IF ONE WAS ISSUED. HOWEVER; NONE WAS GIVEN ON THE INITIAL TKOF CLRNC. MY F/O STATES HE NEVER HEARD ANY WARNING INITIAL OR OTHERWISE.