The 1937 CP-50 Collegiate (ATC 690) prototype was NC21953. Fifty were built, priced at $1,495, or $1,695 for the deluxe version with dual mags, brakes, tail wheel.
The Porterfield CP-65 of 1940 (ATC 720) sold for $1,665, or $1,895 for the deluxe version with dual mags, brakes, tail wheel.
Rankin Aircraft was founded to market an improved version of the prewar Porterfield CP-65, as Collegiate two-seat lightplane for $15,000 in 1984.
CP-50 Collegiate
Engine: 50hp Continental A-50
Wingspan: 34’9″
Length: 22’6″
Useful load: 436 lb
Max speed: 102 mph
Cruise: 91 mph
Stall: 32 mph
Range: 270 mi
Seats: 2
CP-65 Collegiate
1940 (ATC 720)
Engine: 65hp Continental A-65
Wingspan: 34’9″
Length: 22’8″
Useful load: 500 lb
Max speed: 110 mph
Cruise: 100 mph
Stall: 32 mph
Range: 300 mi
Seats: 2
FP-50 Collegiate
1941 (ATC 690)
CP-50 with 50hp Franklin 4AC.
FP-60 Collegiate
1941 (ATC 720)
FP-50 with 60hp Franklin 4AC
$1,560.
FP-65 Collegiate
1940 (ATC 720)
CP-65 with 65hp Franklin 4AC
$1,590.
All Aero 