AN SMA PLT HAND PROPPED HIS ACFT WITHOUT WHILE IT WAS NOT PROPERLY TIED DOWN. THE ACFT RAN INTO ANOTHER ACFT; DAMAGING BOTH AND INJURING THE PLT.

Narrative

AFTER FUELING ACFT AT JUNEAU (DODGE COUNTY ARPT); I NEEDED TO MOVE IT AWAY FROM PUMPS DUE TO HVY TFC. THIS WAS MY LAST STOP ENRTE TO THE EAA CONVENTION AND I WANTED TO REVIEW THE ARR PROCS AND TALK WITH OTHER PLTS; ETC; BEFORE STARTING OUT. NEARBY TIEDOWN POS WERE OCCUPIED; SO I DECIDED TO TAXI ACFT TO A SUITABLE LOCATION. SINCE THIS ACFT HAS NO ELECTRICAL SYS OR STARTER; I ASKED FOR AN EXPERIENCED HELPER. FINDING NONE; I ASKED A MAN TO HOLD THE TAIL WHILE I PROPPED IT. IT DID NOT START READILY; AND; AFTER TURNING ENG BACKWARDS WITH THROTTLE OPEN; I TURNED IGNITION ON AND FORGOT TO REDUCE THROTTLE. THE ENG STARTED. BEING UNABLE TO SHUT OFF ENG OR RESTRAIN IT; THE ACFT MOVED AND COLLIDED WITH AN ACFT WHICH WAS TIED DOWN. DAMAGE TO BOTH ACFT NOT DETERMINED AT THIS TIME. NO PERSONAL INJURIES EXCEPT I FELL AND RECEIVED ABRASIONS AND A HAIRLINE FRACTURE TO AN ARM BONE. IT WAS A BAD DECISION ON MY PART TO TRY TO START THE ENG WITHOUT COMPETENT ASSISTANCE. AS A POSSIBLE FACTOR IN FORGETTING TO REDUCE THE THROTTLE MIGHT BE THAT CONSIDERABLE EFFORT HAD BEEN EXPENDED AND I FELT IT WAS NECESSARY TO EXPEDITE MOVING THE PLANE AWAY FROM THE GAS PUMPS.