There are 8 Porterfield CP-50 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 1939 and 1948.
N25439
1948 Porterfield CP-50
Felton, DE
N25436
1940 Porterfield CP-50
Johannesburg, MI
N25495
1940 Porterfield CP-50
Drexel, MO
N21973
1939 Porterfield CP-50
Hood River, OR
N21987
1939 Porterfield CP-50
Anahiem Hills, CA
N21994
1939 Porterfield CP-50
Ottumwa, IA
N25422
Porterfield CP-50
Cashmere, WA
N25437
Porterfield CP-50
Tillar, AR