Narrative:

While maneuvering near kelly airpark on a west heading I noticed an aircraft well below and to my north that would pass below and behind me during my looping maneuver. To facilitate separation and maintain visual contact I continued the climbing portion of the loop vertically to just below a stall. The other aircraft passed greater than 2;500 ft below and more than 2;500 ft west of our position as we passed through inverted. On the way down I rolled 90 degrees to a south heading to maintain visual contact through the end of the maneuver. We leveled at approximately 9;000 ft MSL on the same heading as the other aircraft well behind it. The tis system in my aircraft never registered a traffic advisory. The other aircraft did not say anything on 122.75; the frequency that we monitor in the area known for high intensity training and aerobatics. I possibly encroached on V81 coming less than 4 miles from the center of the airway maneuvering to avoid the other aircraft. The other aircraft did not appear to ever see us as indicated by their unchanging flight path. I finished the flight without incident.in the future to avoid a situation like this I feel like it would help if there was a note on the chart to monitor 122.75 in this area. All of the flight schools do this now but anyone traveling through there would also benefit having an idea of who is there before they come through.that said I will be utilizing denver approach control in the future to know of a potential conflict more quickly while broadcasting in the blind my position and monitoring 122.75.

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Original NASA ASRS Text

Title: A pilot maneuvering during acrobatic flight in a high performance aircraft may have entered the V81 confines near CO15 while not communicating with ATC but monitoring the training area frequency 122.75.

Narrative: While maneuvering near Kelly Airpark on a west heading I noticed an aircraft well below and to my north that would pass below and behind me during my looping maneuver. To facilitate separation and maintain visual contact I continued the climbing portion of the loop vertically to just below a stall. The other aircraft passed greater than 2;500 FT below and more than 2;500 FT west of our position as we passed through inverted. On the way down I rolled 90 degrees to a south heading to maintain visual contact through the end of the maneuver. We leveled at approximately 9;000 FT MSL on the same heading as the other aircraft well behind it. The TIS system in my aircraft never registered a Traffic Advisory. The other aircraft did not say anything on 122.75; the frequency that we monitor in the area known for high intensity training and aerobatics. I possibly encroached on V81 coming less than 4 miles from the center of the airway maneuvering to avoid the other aircraft. The other aircraft did not appear to ever see us as indicated by their unchanging flight path. I finished the flight without incident.In the future to avoid a situation like this I feel like it would help if there was a note on the chart to monitor 122.75 in this area. All of the flight schools do this now but anyone traveling through there would also benefit having an idea of who is there before they come through.That said I will be utilizing Denver Approach Control in the future to know of a potential conflict more quickly while broadcasting in the blind my position and monitoring 122.75.

Data retrieved from NASA's ASRS site as of July 2013 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.