BELLANCA 7GCBC PVT PLT AT EUL ATTEMPTS A HIGH-SPD TAXI ON A TXWY AND SUBSEQUENTLY TAKES OFF.

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MY HANGAR IS ON W END OF ARPT AND WHILE STARTING UP I LISTENED TO ASOS. THE RPT WAS WIND AT 010 DEGS AT 6 KTS. I TAXIED TO RWY 12 AND NOTICED THE WINDSOCK HAD SHIFTED SW AND A PLANE WAS TAKING OFF ON RWY 30 (5500 FT RWY). WITH NO RPTED TFC ON RADIO (MONITORING 122.7) I DECIDED TO PRACTICE A HIGH SPD TAXI ON MAINS (7GCBC IS A TAIL-DRAGGER) ON MAIN TXWY. WIND WAS A QUARTERING TAILWIND WITH NO FLAPS; I TRIED TO MAINTAIN A SPD BELOW 'TO' RANGE. JUST PAST MIDWAY; I WAS STARTING TO GET LIGHT ON MAINS AND STARTED TO PULL PWR. JUST AT THAT TIME; A HELI TRAINING ANNOUNCED IT WAS ON FINAL FOR PARALLEL TXWY RWY 30. ALTHOUGH WE HAD PLENTY OF SEPARATION; FOR ME TO SLOW DOWN; IT MEANT THE HELI WOULD HAVE TO EXTEND HIS TOUCHDOWN POINT. WITH THE PRESENT MOMENTUM I DECIDED THE BEST PLAN OF ACTION WAS TO APPLY PWR AND TAKE OFF FROM TXWY. THIS PRECLUDED A CONFLICT WITH SEPARATION. NO OTHER TFC WAS RPTING FOR DEP OR ARR. ANALYSIS -- I PROBABLY SHOULD NOT HAVE BEEN TRYING TO PRACTICE A HIGH-SPD TAXI ON TXWY; RETROSPECTIVELY; I SHOULD HAVE ANNOUNCED MY INTENTIONS AND PRACTICED ON THE RWY. SECOND; I DID NOT MAINTAIN ADEQUATE SPD CTL OTHERWISE; I WOULD NOT HAVE BEEN LIGHT ON THE MAINS. THIRD; I DID MAINTAIN SITUATIONAL AWARENESS IN REGARDS TO THE HELI TFC THAT TRAIN AT EUL AND USE THE PARALLEL TXWY AS THEIR RWY.