Narrative:

The preflight, taxi and takeoff were unremarkable. I believe I was sitting at taxiway C (on the east side of the runway), waiting for takeoff clearance. I was sequenced for what appeared to be the #5 position for takeoff. What appeared to be the incident C172, was directly across from me on the opposing taxiway. The other aircraft in front of me were quickly sequenced and departed. This left me and the C172 -- which I was sequenced ahead of. I was cleared for takeoff and the C172 was cleared for takeoff immediately behind me. Knowing that he would overtake me, I turned to the east more than usual, before heading north to the practice area. I was under the impression he was a northerly departure and I wanted to give him plenty of room to pass ahead of me. As we left addison's airspace, the controller called the C172 and told him there was a C150 in front of him. As I recall, the pilot said, 'he had the traffic in sight.' I climbed at about 500 FPM to 2000 ft MSL and turned slowly to a heading of roughly 360 degrees. From takeoff, I had traveled approximately 8-10 mi when the incident occurred. The C172 suddenly appeared off my left wing, at a distance of what appeared to be about 40 ft. My altitude was 2000 ft MSL and his was 2000 ft MSL. My heading was 360 degrees and his was 350 degrees. We were wingtip to wingtip. The other aircraft was also bouncing in turbulence about 10 ft up and down. The turbulence was light with occasional moderate. The other aircraft was moving from right to left and he was in a very shallow l-hand turn moving through about 350 degrees and pulling ahead of me. The way aircraft suddenly 'appeared so close' was very startling. Also, the way he just 'appeared' off my left wing, gave me the impression that he came down or bounced down, from a slightly higher altitude. I could see the person in the copilot seat, he was looking straight ahead. The other aircraft continued on somewhat of a northwest heading over to lake lewisville, and moved out of sight. I aborted the training mission and returned to my home base. After landing, I contacted addison tower by phone and told the tower supervisor what had happened. The cause of the near miss was the failure of the pilot of the overtaking aircraft to keep me in sight even after ATC specifically alerted him to the traffic. Another factor may have been convective turbulence. It is puzzling that since he was turning from right to left, he possibly could have seen me in his 10 or 11 O'clock position before he initiated his turn. The reason for his failure to see and avoid is unknown.

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Original NASA ASRS Text

Title: C150 DEPARTING ADS HAS NMAC WITH SUCCEEDING FASTER C172.

Narrative: THE PREFLT, TAXI AND TKOF WERE UNREMARKABLE. I BELIEVE I WAS SITTING AT TXWY C (ON THE E SIDE OF THE RWY), WAITING FOR TKOF CLRNC. I WAS SEQUENCED FOR WHAT APPEARED TO BE THE #5 POS FOR TKOF. WHAT APPEARED TO BE THE INCIDENT C172, WAS DIRECTLY ACROSS FROM ME ON THE OPPOSING TXWY. THE OTHER ACFT IN FRONT OF ME WERE QUICKLY SEQUENCED AND DEPARTED. THIS LEFT ME AND THE C172 -- WHICH I WAS SEQUENCED AHEAD OF. I WAS CLRED FOR TKOF AND THE C172 WAS CLRED FOR TKOF IMMEDIATELY BEHIND ME. KNOWING THAT HE WOULD OVERTAKE ME, I TURNED TO THE E MORE THAN USUAL, BEFORE HEADING N TO THE PRACTICE AREA. I WAS UNDER THE IMPRESSION HE WAS A NORTHERLY DEP AND I WANTED TO GIVE HIM PLENTY OF ROOM TO PASS AHEAD OF ME. AS WE LEFT ADDISON'S AIRSPACE, THE CTLR CALLED THE C172 AND TOLD HIM THERE WAS A C150 IN FRONT OF HIM. AS I RECALL, THE PLT SAID, 'HE HAD THE TFC IN SIGHT.' I CLBED AT ABOUT 500 FPM TO 2000 FT MSL AND TURNED SLOWLY TO A HEADING OF ROUGHLY 360 DEGS. FROM TKOF, I HAD TRAVELED APPROX 8-10 MI WHEN THE INCIDENT OCCURRED. THE C172 SUDDENLY APPEARED OFF MY L WING, AT A DISTANCE OF WHAT APPEARED TO BE ABOUT 40 FT. MY ALT WAS 2000 FT MSL AND HIS WAS 2000 FT MSL. MY HEADING WAS 360 DEGS AND HIS WAS 350 DEGS. WE WERE WINGTIP TO WINGTIP. THE OTHER ACFT WAS ALSO BOUNCING IN TURB ABOUT 10 FT UP AND DOWN. THE TURB WAS LIGHT WITH OCCASIONAL MODERATE. THE OTHER ACFT WAS MOVING FROM R TO L AND HE WAS IN A VERY SHALLOW L-HAND TURN MOVING THROUGH ABOUT 350 DEGS AND PULLING AHEAD OF ME. THE WAY ACFT SUDDENLY 'APPEARED SO CLOSE' WAS VERY STARTLING. ALSO, THE WAY HE JUST 'APPEARED' OFF MY L WING, GAVE ME THE IMPRESSION THAT HE CAME DOWN OR BOUNCED DOWN, FROM A SLIGHTLY HIGHER ALT. I COULD SEE THE PERSON IN THE COPLT SEAT, HE WAS LOOKING STRAIGHT AHEAD. THE OTHER ACFT CONTINUED ON SOMEWHAT OF A NW HEADING OVER TO LAKE LEWISVILLE, AND MOVED OUT OF SIGHT. I ABORTED THE TRAINING MISSION AND RETURNED TO MY HOME BASE. AFTER LNDG, I CONTACTED ADDISON TWR BY PHONE AND TOLD THE TWR SUPVR WHAT HAD HAPPENED. THE CAUSE OF THE NEAR MISS WAS THE FAILURE OF THE PLT OF THE OVERTAKING ACFT TO KEEP ME IN SIGHT EVEN AFTER ATC SPECIFICALLY ALERTED HIM TO THE TFC. ANOTHER FACTOR MAY HAVE BEEN CONVECTIVE TURB. IT IS PUZZLING THAT SINCE HE WAS TURNING FROM R TO L, HE POSSIBLY COULD HAVE SEEN ME IN HIS 10 OR 11 O'CLOCK POS BEFORE HE INITIATED HIS TURN. THE REASON FOR HIS FAILURE TO SEE AND AVOID IS UNKNOWN.

Data retrieved from NASA's ASRS site as of July 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.