There are 3 Quad City Ultralight CHALLENGER II 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 1992 and 2000.
N3055K
2000 Quad City Ultralight Corp CHALLENGER II
Carpinteria, CA
N6613Z
1992 Quad City Ultralight Corp CHALLENGER II
Clarks Summit, PA
N23310
Quad City Ultralight Corp CHALLENGER II
Rockford, MI