There are 3 Quad City Ultralight Acft CHALLENGER 1 SPEC 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 1999 and 2003.
N477CM
2003 Helms John H GLASSAIR III
Palmdale, CA
N47RC
1999 Crawford Roger CHALLENGER II CWS
Enid, OK
N775DP
Piedmonte Dennis A CHALLENGER 1 PCW SPC
Holley, NY