C177 PLT HAS A CONFLICT WITH ANOTHER ACFT DURING TKOF FROM RWY 29 AT HEG.

Narrative

WINDS WERE BLOWING FROM 310 DEGS AND FAVORING RWY 29. AS I TAXIED TO RWY 29; I NOTICED ACFT #2 ON THE RUN-UP AREA FOR RWY 25. IT IS COMMON THAT THE MAINT SHOPS ON THE FIELD GO TO THE RWY 25 RUN-UP AREA TO TEST THE ENG AT FULL PWR. I CALLED XING RWYS WITH MY INTENTION TO GO TO RWY 29; REACHED THE RUN-UP AREA; DID MY RUN-UP. AN ACFT Y IN THE PATTERN CALLED BASE FOR RWY 7. I ANNOUNCED THAT I WAS PROCEEDING TO TAKE RWY 29 FOR DEP; HAD THE ACFT Y IN SIGHT AND WOULD REMAIN CLR. I WOULD BE GONE BEFORE HE WAS ON SHORT FINAL. I COULD NOT SEE THE BEGINNING OF RWY 25 BECAUSE OF TREES IN THE WAY BTWN THE APCH ENDS OF RWY 29 AND RWY 25; BUT I HEARD NOTHING FROM ACFT Z SINCE THE TIME I SAW IT AT THE RUN-UP AREA. I APPLIED FULL PWR AND JUST AFTER LIFTOFF I SAW ACFT Z CROSS MY PATH; TAKING OFF ON RWY 25; DIRECTLY INTO THE PATH OF ACFT Y; WHO WAS NOW ON FINAL. ACFT Y IMMEDIATELY MADE A R TURN FOR DOWNWIND RWY 29; ACFT Z MADE A VERY LOW LEVEL (50 FT OR SO) HARD R TURN AND DEPARTED TO THE NW. I CONTINUED TKOF WITH NO ISSUES; ACFT Y LANDED ON RWY 29 WITH NO PROBS. NEITHER THE ACFT Y PLT; NOR MYSELF HEARD ANYTHING FROM ACFT Z. WHAT DID I LEARN? ALTHOUGH THERE WAS LITTLE RISK TO MY ACFT IN THIS INCIDENT; WITH ACFT Y ON BASE FOR AN INTERSECTING RWY; I SHOULD HAVE WAITED FOR ACFT Y TO LAND BEFORE TAKING RWY 29 FOR DEP. HE WAS MUCH FASTER THAN I ANTICIPATED. SECONDLY; I LEARNED THE IMPORTANCE OF COMS AT UNCTLED ARPTS. IN HINDSIGHT; ALTHOUGH I'M NOT SURE IF ACFT Z HAD WORKING RADIOS; I SHOULD HAVE ASKED ITS INTENTIONS. I MIGHT NOT HAVE GOTTEN A RESPONSE; BUT THAT MAY HAVE ALERTED ACFT Y PLT THAT THERE WAS AN ACFT AT THE END OF RWY 25. I SHOULD HAVE ALSO TOLD ACFT Y PLT THAT THERE WAS AN ACFT IN THE RWY 25 RUN-UP AREA.