Narrative:

I had departed the traffic pattern at portage co airport rauenna, oh VFR and was climbing to my cruise altitude in small aircraft X. Approximately 3 mi southwest of the airport at approximately 1900' a white and blue small aircraft Y appeared from the blind spot created by the fight wing of my aircraft. The aircraft was slightly higher than I and approximately 300' to the right of my aircraft. The aircraft was in a steep right bank, traveling at a speed estimated to be approximately 30-50 mph above my 75 mph climb speed. I have no way of knowing if the other pilot spotted me first and was turning away, or he may have been executing a steep turn and may or may not have seen my aircraft. WX was excellent, I was monitoring unicom and scanning for other traffic. There were no cockpit duties to distract my attention. I do not know why I was unable to spot the other aircraft prior to the time it moved into the blind spot that allowed it to close on my aircraft until its grater speed brought it into view just ahead of my right wing. I do not know what could be done to prevent a recurrence of this incident. It is most disturbing to realize that even though proper procedures were followed, use of unicom, proper scanning technique etc in excellent WX, I did not spot the other aircraft prior to the time it was hidden in a blind spot of my aircraft. The execution of gentle s-turns in the climb could have made the other aircraft visible sooner and might have prevented the other aircraft from moving in so close prior to becoming visible. This would be an excellent back up in case the other aircraft was not spotted prior to moving into a blind spot of your aircraft.

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Original NASA ASRS Text

Title: EXPERIENCED PLT OF LIGHT ACFT HAS NMAC WITH ANOTHER LIGHT ACFT WHILE DEPARTING AN UNCONTROLLED ARPT.

Narrative: I HAD DEPARTED THE TFC PATTERN AT PORTAGE CO ARPT RAUENNA, OH VFR AND WAS CLIMBING TO MY CRUISE ALT IN SMA X. APPROX 3 MI SW OF THE ARPT AT APPROX 1900' A WHITE AND BLUE SMA Y APPEARED FROM THE BLIND SPOT CREATED BY THE FIGHT WING OF MY ACFT. THE ACFT WAS SLIGHTLY HIGHER THAN I AND APPROX 300' TO THE RIGHT OF MY ACFT. THE ACFT WAS IN A STEEP RIGHT BANK, TRAVELING AT A SPEED ESTIMATED TO BE APPROX 30-50 MPH ABOVE MY 75 MPH CLIMB SPEED. I HAVE NO WAY OF KNOWING IF THE OTHER PLT SPOTTED ME FIRST AND WAS TURNING AWAY, OR HE MAY HAVE BEEN EXECUTING A STEEP TURN AND MAY OR MAY NOT HAVE SEEN MY ACFT. WX WAS EXCELLENT, I WAS MONITORING UNICOM AND SCANNING FOR OTHER TFC. THERE WERE NO COCKPIT DUTIES TO DISTRACT MY ATTN. I DO NOT KNOW WHY I WAS UNABLE TO SPOT THE OTHER ACFT PRIOR TO THE TIME IT MOVED INTO THE BLIND SPOT THAT ALLOWED IT TO CLOSE ON MY ACFT UNTIL ITS GRATER SPEED BROUGHT IT INTO VIEW JUST AHEAD OF MY RIGHT WING. I DO NOT KNOW WHAT COULD BE DONE TO PREVENT A RECURRENCE OF THIS INCIDENT. IT IS MOST DISTURBING TO REALIZE THAT EVEN THOUGH PROPER PROCS WERE FOLLOWED, USE OF UNICOM, PROPER SCANNING TECHNIQUE ETC IN EXCELLENT WX, I DID NOT SPOT THE OTHER ACFT PRIOR TO THE TIME IT WAS HIDDEN IN A BLIND SPOT OF MY ACFT. THE EXECUTION OF GENTLE S-TURNS IN THE CLIMB COULD HAVE MADE THE OTHER ACFT VISIBLE SOONER AND MIGHT HAVE PREVENTED THE OTHER ACFT FROM MOVING IN SO CLOSE PRIOR TO BECOMING VISIBLE. THIS WOULD BE AN EXCELLENT BACK UP IN CASE THE OTHER ACFT WAS NOT SPOTTED PRIOR TO MOVING INTO A BLIND SPOT OF YOUR ACFT.

Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.