There are 5 Tl-Ultralight Sro STING S4 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 2012 and 2013.
N5511
2013 Tl-Ultralight Sro STING S4
Front Royal, VA
N184WA
2012 Tl-Ultralight Sro STING S4
Frankfort, IL
N316DK
2012 Tl-Ultralight Sro STING S4
Ceresco, MI
N4747
2012 Tl-Ultralight Sro STING S4
Lakewood, CO
N368TJ
Tl-Ultralight Sro STING S4
Flagstaff, AZ