GLIDER TOW PLT OPERATING OUT OF X51 ALMOST; BUT NOT QUITE; ENTERED CLASS D AIRSPACE AT HST WITHOUT CLRNC.

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I HAD RECENTLY GOTTEN CHKED OUT TO FLY AS TOW PLT FOR A NEW GLIDER SCHOOL. THE GLIDER SCHOOL HAS A VERY STRICT TOW PATTERN TO FLY AFTER TKOF; AND I WAS DOING MY BEST TO FIT INTO THE NEW OP. WE HOOKED UP THE GLIDER; I LINED UP; AND PER PROC; ANNOUNCED OUR OP ON THE CTAF AND COMMENCED THE TKOF. I WAS DETERMINED TO FOLLOW THE SET TOW PATTERN; WHICH WAS A L TURN AFTER AIRBORNE; THEN AT 500 FT; A R TURN WBOUND; AND AT 1000 FT A TURN TO DUE E UNTIL RELEASE (NORMALLY AT 2500 FT). AS I SAID; THE DAY WAS VERY HOT; AND THE GLIDER HAD THE INSTRUCTOR AND A STUDENT; SO THE CLB WAS PROCEEDING SLOWLY. I HAD TOWED SOLO STUDENTS THE DAY BEFORE; SO I GUESS I WAS SUBCONSCIOUSLY EXPECTING TO REACH RELEASE ALT AT THE SAME PLACE. OF COURSE; THIS WASN'T THE CASE WITH 2 PEOPLE IN THE GLIDER. I FAILED TO NOTICE THAT WITH THE ANEMIC CLB; WE WERE PROCEEDING FURTHER E THAN NORMAL. JUST ABOUT 2000 FT; I REALIZED THE SIT WITH HOMESTEAD AFB; AND ITS CLASS D AIRSPACE (WHICH IS LARGER THAN NORMAL); WHICH LAID DUE E OF MY POS. I MADE A 45 DEG TURN TO THE S; AND MISSED THE CLASS D AIRSPACE AT HST. AFTER RELEASE; I RETURNED TO X51 NORMALLY; WITH A NEW LESSON LEARNED. 1ST; I HAD SUBCONSCIOUSLY THOUGHT THAT THERE REALLY WASN'T ANY AIRSPACE TO WORRY ABOUT FLYING OUT OF X51 AS LONG AS I DIDN'T GO N. ALTHOUGH I KNEW HST AND ITS CLASS D WAS THERE; I PAID IT NO MIND SINCE IT SEEMED SO FAR AWAY. 2ND; I ALLOWED MYSELF TO BECOME ACCUSTOMED TO THE PERFORMANCE OF THE TOW PLANE WITH 1 PERSON IN THE GLIDER; AND WHERE REACHING THE RELEASE ALT OCCURRED (NORMALLY NOT SO FAR E). 3RD; I FELL INTO THE RUT OF MAKING SURE I FOLLOWED THE TOW PATTERN PRECISELY; WITHOUT TAKING INTO ACCOUNT THE LOWERED PERFORMANCE. 4TH; I FELL INTO THE TRAP OF FIXATING ON 1 TASK. FINALLY; I COULD HAVE ALWAYS GIVEN THE TWR AT HOMESTEAD AFB A CALL. HOW HARD WAS THAT? BUT WHEN YOU DO REPEATED OPS OUT OF AN UNCTLED FIELD; EVENTUALLY YOU FEEL LIKE IT'S TOO MUCH TROUBLE; AND JUST AVOID THEIR AIRSPACE.