GULFSTREAM IV FLT CREW ON DEP FROM WSSL (SELETAR; SINGAPORE) IS ISSUED CLRNC TO REMAIN IN SELETAR CTL ZONE.

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ON DEP FROM SINGAPORE SELETAR ARPT; WE WERE CLRED FOR TKOF RWY 21 AND TO CLB RWY HDG. NORMAL TKOF CLRNC CALLS FOR A R TURN AFTER TKOF; TO REMAIN WITHIN THE SELETAR CTL ZONE. THERE WERE 2 LIGHT ACFT IN PATTERN; AND ATC WAS COORDINATING THE SPACING. AFTER TKOF AT 1500 FT; THE PF CALLED FOR FLAPS UP. THIS IS CONTRARY TO OUR NORMAL PROC FOR THIS RWY. JUST AT THAT POINT ATC INSTRUCTED US TO MAKE A R TURN FOR THE DOWNWIND LEG AND TO REMAIN WITH THE SELETAR CTL ZONE. AS OUR AIRSPD INCREASED; I COULD SEE OUR CURRENT TURN RADIUS WAS NOT GOING TO KEEP US WITHIN THE CTL ZONE AND I INSTRUCTED THE PF TO TIGHTEN THE TURN. HE THEN MADE A VERY MINOR CORRECTION AND INCREASED BANK TO APPROX 30 DEGS. AT THIS POINT ATC AGAIN INSTRUCTED US TO REMAIN WITHIN THE SELETAR CTL ZONE AND AGAIN I TOLD THE PF HE NEEDED TO TIGHTEN THE TURN OR WE WOULD NOT REMAIN WITHIN OUR AREA. HE MADE NO FURTHER CORRECTION AND ALLOWED THE AIRSPD TO INCREASE TO 250 KTS. AT THIS SPD OUR TURN RADIUS WAS SO BIG; WE ENDED UP FLYING N OF THE MIL CTL TWR OF THE ARPT TO THE N AND ACTUALLY OVER ITS RWY AT 2500 FT AND 250 KTS. WHEN I INFORMED THE OTHER PLT OF WHAT HE HAD JUST DONE; HE SAID HE DIDN'T CARE.