The Piper Geronimo is a highly modified version of the original Piper Apache (PA‑23), extensively upgraded for improved speed, performance, and utility. Originally developed in the 1950s, the Apache was Piper's first twin-engine design. The Geronimo conversion emerged in the 1960s and 70s as a popular aftermarket upgrade kit, which included more powerful engines, improved aerodynamics, and a taller vertical stabilizer for enhanced stability.
The Geronimo conversion typically replaced the standard 150 or 160 hp engines with 180 hp Lycoming O‑360s, increased gross weight limits, added fuel capacity, and even revamped the landing gear and nose for better flight efficiency. The result was a twin-engine aircraft with significantly improved climb rate, cruise speed, and handling—bringing new life to aging Apaches.
Geronimos were often favored by flight schools, private owners, and bush pilots who wanted the economy and reliability of the Apache but with improved performance and ramp appeal. Though no longer in production, the Geronimo remains a unique and admired part of Piper's twin-engine legacy.
A conversion of the Piper Apache, the Geronimo featured more powerful engines, aerodynamic improvements, and modernized avionics—offering better performance and utility than the original.
• Number Converted: Approx. 500 conversions
• Conversion Period: 1960s–1980s
• Serial Number: PA23-27-1001G (Example)
• Length: 27 ft. 9 in.
• Wingspan: 37 ft. 1 in.
• Empty Weight: 2,650 lbs.
• Loaded Weight: 3,800 lbs.
• Engines: 2 × Lycoming O-320 / 160 hp each
• Cruising Speed: 165 mph
• Max Speed: 190 mph
• Range: 1,000 miles
• Ceiling: 19,500 ft
• Rate of Climb: 1,400 ft./min.
• None – Civilian aircraft conversion