AEROBATIC PRACTICING AA5 INADVERTENTLY PENETRATES HOU CLASS B AIRSPACE.

Narrative

I WAS PRACTICING CHANDELLES; LAZY 8'S; STEEP TURNS; ETC; AND I DRIFTED INTO HOUSTON CLASS B AIRSPACE. I STARTED MY FLT BY FLYING FROM SPX TO THE SE TO GET OUT FROM UNDER CLASS B AIRSPACE AND THEN CLBED TO 5500 FT MSL TO GET ABOVE THE FEW CLOUDS THAT WERE OUT THERE AND BEGAN MY PRACTICE (BASES 3000 FT MSL; TOPS 4500 FT). I WAS ABOUT 25-28 MI DME FROM HOBBY. I WAS MONITORING 134.45 AND LOOKING OUT FOR TFC AS I PRACTICED. SINCE IT WAS NIGHT; IT WAS A LITTLE HARD TO KEEP TRACK OF MY GND TRACK. WHILE PRACTICING; I WOULD GET CLOSER TO CLASS B AIRSPACE AND THEN TURN AROUND AND FLY BACK OUTBOUND TO GET FURTHER AWAY. UNFORTUNATELY; ONE TIME I DRIFTED INTO CLASS B AIRSPACE. I LOOKED DOWN TO SEE WHERE I WAS AND I REALIZED I HAD GONE TOO FAR. THE DME SHOWED 18.2 FROM HOBBY (20 NM IS CLASS B). I QUICKLY TURNED AND EXITED THE AIRSPACE AND DSNDED TO A LOWER ALT. I DIDN'T HEAR ANYTHING ABOUT THIS FROM APCH WHILE I WAS MONITORING THE FREQ. I'M SURE THEY KNEW ABOUT MY INDISCRETION; BUT NOBODY WAS IN THE AREA; SO I GUESS IT DIDN'T MATTER TO THEM. I DIDN'T PUT ANYONE IN DANGER; BUT I SHOULD HAVE PAID CLOSER ATTN TO MY GND TRACK. IT WAS A ROOKIE MISTAKE AND I SHOULD KNOW BETTER. I CAN PROMISE YOU THIS -- IT WON'T HAPPEN AGAIN!