Rv-6 pilot reported a near mid-air collision with another aircraft while on a charity flight.

Attributes
ACN	1650461
Time
Date	201905
Local Time Of Day	1201-1800
Place
Locale Reference	LSE.Airport
State Reference	WI
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	RV-6
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	None
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	None
Flight Plan	None
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 15 Flight Crew Total 991 Flight Crew Type 230
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 100 Vertical 100

Narrative:

While flying [a charity flight] I heard on the radio; 'wow! That's a nice rv'. I suspected that I was close to another aircraft for that transmission to occur; however I could not locate one. After looking all around; I noticed the taylorcraft also providing rides about a mile in trail of me and at the same altitude.I was surprised that it was at the same altitude because I was briefed that low-wing aircraft were to fly at 2000 feet and high-wing would fly at 2500 feet. When I got on the ground and after the taylorcraft landed; I introduced myself to the pilot of the taylorcraft and inquired about how close we were. The pilot said that I flew over the top of him. I was shocked because I expected that he was near 2500 feet. I told him that I was briefed that low-wings were to be at 2000 feet and high-wings were at 2500 feet. He replied; 'yeah; but I can't get to 2500 in this'. I never saw the taylorcraft and informed the pilot that I never saw him. He said 'that's scary!' I agreed.I was fairly upset with myself for not seeing the other aircraft and reflected on what could have distracted me. At the time I was pointing out to the [passenger] the instrument panel; specifically the altimeter and airspeed. However; I was still doing my traffic scan. I believe that this should be a learning event and I intend to brief this at our next [organization] meeting.

Original NASA ASRS Text

Title: RV-6 pilot reported a near mid-air collision with another aircraft while on a charity flight.

Narrative: While flying [a charity flight] I heard on the radio; 'Wow! That's a nice RV'. I suspected that I was close to another aircraft for that transmission to occur; however I could not locate one. After looking all around; I noticed the Taylorcraft also providing rides about a mile in trail of me and at the same altitude.I was surprised that it was at the same altitude because I was briefed that low-wing aircraft were to fly at 2000 feet and high-wing would fly at 2500 feet. When I got on the ground and after the Taylorcraft landed; I introduced myself to the pilot of the Taylorcraft and inquired about how close we were. The pilot said that I flew over the top of him. I was shocked because I expected that he was near 2500 feet. I told him that I was briefed that low-wings were to be at 2000 feet and high-wings were at 2500 feet. He replied; 'Yeah; but I can't get to 2500 in this'. I never saw the Taylorcraft and informed the pilot that I never saw him. He said 'That's scary!' I agreed.I was fairly upset with myself for not seeing the other aircraft and reflected on what could have distracted me. At the time I was pointing out to the [passenger] the instrument panel; specifically the altimeter and airspeed. However; I was still doing my traffic scan. I believe that this should be a learning event and I intend to brief this at our next [organization] meeting.

Data retrieved from NASA's ASRS site 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.