Model Variants (Including Prototypes)
Yak-18 - Initial Production Models
Yak-18A - Definitive Production Model; fitted with Ivchenco AI-14 FR engine of 260 horsepower.
Yak-18U - Limited-production model with retractable tricycle undercarriage.
Yak-18P ("Mouse") - Single-seat acrobatic mount
Yak-18PM - Single-seat acrobatic mount with retractable tricycle undercarriage.
Yak-18PS - Acrobatic variant with retractable tailwheel.
Nanchang CJ-5 - Chinese designation for license-produced versions; 379 examples produced.