There are 4 Ayres S2R-R3S aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1979 and 1980.
N4019Q
1980 Ayres Corporation S2R-R3S
Buckeye, AZ
N4014A
1979 Ayres Corporation S2R-R3S
Deming, NM
N4014D
1979 Ayres Corporation S2R-R3S
Deming, NM
N4012G
Ayres Corporation S2R-R3S
Yuma, AZ