Piper PA-11 Cub Special

Note on production numbers: Of the 1,541 civilian PA-11s built, approximately 600 were delivered with the A-65 engine and the remainder with the C-90. Many A-65 examples have since been upgraded to C-85 or C-90 engines under the type certificate data sheet, so the majority of flying PA-11s today have 85-90 HP. Buyers should verify engine installation paperwork carefully.

The PA-11 with the C-90 engine is a noticeably livelier airplane than the A-65-powered J-3 Cub. The additional 25 horsepower (a 38% increase) transforms the aircraft from marginally powered with two occupants to comfortably adequate. Climb rate increases from the J-3's 450 fpm to approximately 540 fpm at sea level, and the airplane feels less strained at gross weight.

Cruise speed with the C-90 is approximately 75 KTAS (87 mph), roughly 10 knots faster than a stock J-3. Fuel burn increases proportionally to about 5 GPH, but the PA-11's larger 17-gallon fuel tank (versus the J-3's 12 gallons) provides meaningfully better range of approximately 300 nm with reserve. This is the single most important practical difference between the PA-11 and J-3: an extra 100+ nm of range opens up the airplane for short cross-country flights that the J-3 simply cannot manage without a fuel stop.

Short-field performance remains excellent. The 350-foot ground roll and 700-foot over-50-foot takeoff distance are competitive with any modern LSA. Landing performance is similarly impressive, with ground rolls under 300 feet routine for experienced pilots. The light wing loading and low approach speeds make the PA-11 comfortable on rough grass strips that would challenge heavier aircraft.

The PA-11 retains the J-3's benign stall characteristics. The break is gentle, recovery is immediate, and the airplane gives ample warning through airframe buffet. Stall speed of approximately 30-33 KIAS makes this one of the slowest-stalling certified aircraft in existence.

The PA-11's payload-range picture is meaningfully better than the J-3 Cub's, thanks to the 17-gallon fuel tank (vs. 12 gallons) and C-90 engine's better specific fuel consumption at cruise power settings.

Scenario 1: Solo Flight (Maximum Range)

Solo with full fuel, the PA-11 has nearly 190 lbs remaining for gear and margin. The 300 nm range makes short cross-country flights entirely practical -- a significant improvement over the J-3's 190 nm.

Scenario 2: Two Occupants

Two average-weight occupants with full fuel put the PA-11 very close to gross weight. This is tighter than it appears -- the PA-11's 490-lb useful load (vs. the J-3's 540 lbs) reflects the heavier C-90 engine and associated accessories. Practically, most two-person flights should depart with 14-15 gallons to maintain margin.

Scenario 3: Two Occupants (Reduced Fuel)

Reducing fuel to 14 gallons still provides 240 nm of range with reserve while giving a small margin below gross weight. This is the realistic two-person configuration for most flights.

PA-11 vs. J-3: The Weight Tradeoff

The PA-11's heavier engine (C-90 vs. A-65) reduces useful load by approximately 50 lbs compared to the J-3, despite the identical 1,220 lb gross weight. The PA-11 compensates with its larger fuel tank and better cruise efficiency. In practice, the PA-11 carries the same two people roughly the same distance as a J-3 but gets there 10 knots faster and with a more comfortable power margin.

Flight Training (6/10): An excellent tailwheel trainer that improves on the J-3 by allowing solo from the front seat, giving the student better forward visibility for landings. The C-90 engine provides more margin for training maneuvers. Docked points because most PA-11s still lack electrical systems and radios, limiting training to uncontrolled VFR environments. For tailwheel endorsements and stick-and-rudder fundamentals, it is superb.

Backcountry (7/10): A step above the J-3 for backcountry use thanks to the C-90's better climb performance and the larger fuel tank. Solo backcountry with camping gear is very practical. Two occupants plus minimal gear is feasible but requires careful weight management. The PA-11 accesses the same short, rough strips as the J-3 while offering better margins. Still limited by two seats and modest payload compared to a PA-12 or PA-18 Super Cub.

Business Travel (1/10): Same limitations as the J-3: no electrical system (typically), no radios, two tandem seats, and 75 KTAS cruise. Not a transportation airplane.

Aerobatics (1/10): Not approved for aerobatic flight. Same structural limitations as the J-3.

Cross-Country (3/10): The 17-gallon tank and 75 KTAS cruise make the PA-11 marginally capable for short cross-country flights of 200-250 nm. This is a meaningful improvement over the J-3's 190 nm range, though it remains impractical for any serious distance flying. Adding a radio and GPS (with an electrical system) makes the airplane more versatile for navigating near controlled airspace.

Cargo Hauling (1/10): Limited useful load and minimal baggage capacity. Not a cargo airplane.

Local Fun (9/10): Nearly as joyful as the J-3, with the bonus of better climb performance and a larger fuel tank allowing longer flights without refueling. The PA-11 is a wonderful Saturday morning grass-strip airplane. A point docked versus the J-3 only because the PA-11 lacks the cultural cachet of the iconic yellow Cub, not because the flying experience is inferior.

Surveying (2/10): Same limitations as the J-3. Slow speed is an advantage, but lack of systems limits practical survey work.

The PA-11's avionics situation mirrors the J-3 Cub almost exactly. Most examples lack an electrical system from the factory, and the panel is minimal: airspeed, altimeter, tachometer, oil temperature, and oil pressure.

Purist ($0): Hand-prop start, no electrical system, handheld radio and portable GPS. Perfectly adequate for uncontrolled-field VFR operations. The majority of PA-11s fly this way.

Minimal Electrical ($2,000-$5,000): Lightweight electrical system supporting a single COM radio (Garmin GTR 200 or equivalent) and portable ADS-B solution. Opens towered-field access. Battery installation via logbook entry per AC 43.13.

Panel-Mounted ($5,000-$12,000): COM radio, ADS-B Out transponder, and panel-mounted GPS. This level of modification is less common in PA-11s than in PA-18 Super Cubs, but it is feasible and supported by the same STCs.

Weight is the limiting factor. Every pound of avionics reduces the PA-11's already modest useful load. Owners who want avionics-equipped Cubs increasingly gravitate toward the PA-18 Super Cub, which has more useful load and a wider STC ecosystem for panel upgrades.

The PA-11 benefits from extensive parts and STC commonality with the J-3 Cub. Most J-3 STCs either directly apply to the PA-11 or have PA-11-specific counterparts.

Engine Options

The C-90 is the sweet spot for PA-11s. It provides meaningful performance improvement over the A-65 without the weight penalty and complexity of the O-200. Most PA-11 buyers should seek a C-90-equipped example or budget for the upgrade.

Other Common Modifications

PA-11 to PA-18 Conversion

A note of caution: some PA-11s have been modified extensively with PA-18 Super Cub components (wings, gear, engine mounts) to approximate PA-18 performance. While many of these modifications are STC-approved, buyers should verify that all modifications are properly documented with 337 forms and that the aircraft remains on its original PA-11 data plate. A heavily modified PA-11 may be a capable airplane, but unclear paperwork creates airworthiness and resale issues.

Parts Availability -- Good

The PA-11 shares the vast majority of its parts with the J-3 Cub, and the same suppliers serve both types:

• Univair Aircraft Corporation: Primary aftermarket supplier. Stocks PA-11-specific parts alongside J-3 components.
• Wag-Aero: Additional aftermarket source.
• Cub Club (cubclub.org): The same community that supports the J-3 also supports the PA-11 under the shared type certificate.
• Continental engine parts: A-65, C-85, and C-90 parts remain well-supported through Continental Aerospace Technologies and aftermarket suppliers.

Parts availability is rated "good" rather than "excellent" only because the PA-11's smaller production run (1,541 vs. ~20,000 J-3s) means PA-11-specific parts (cowling components, fuel tank) are less abundant in the salvage market.

Mechanic Familiarity -- Common

Any A&P familiar with J-3 Cubs can work on a PA-11 with no additional training. The airframe, engine, and systems are effectively identical. The Continental C-90 is a straightforward engine that any small-Continental mechanic handles routinely.

Annual Cost Range

Operating costs are slightly higher than the J-3 due to the C-90's increased fuel burn and higher overhaul cost, but the PA-11 remains one of the most affordable certified aircraft to own and fly.

The PA-11 trades at a modest premium to comparable J-3 Cubs when equipped with the C-90 engine, reflecting the better performance and larger fuel tank. However, the PA-11 lacks the J-3's cultural icon status, which caps its collector premium.

Price Tiers (2025-2026)

Key Value Drivers

• Engine: C-90 commands $5,000-$10,000 premium over A-65. O-200 adds further value if properly documented.
• Fabric condition: Same impact as J-3. Fresh fabric adds $10,000-$15,000.
• Engine time: Freshly overhauled adds $8,000-$15,000 versus run-out.
• Metal spars: Preferred. Add $3,000-$5,000 versus wood.
• Sealed struts: Minor value add but eliminates recurring AD.
• Float/ski capability: Float-equipped PA-11s command significant premiums in northern markets.

The PA-11 is a rational choice for buyers who want Cub-family flying with better performance than a stock J-3 and are willing to forgo the J-3's name recognition. Values have been appreciating at 3-5% annually, roughly tracking the J-3 market.

Airworthiness Directives

The PA-11 shares most of its AD history with the J-3 Cub due to the common type certificate:

• Wing strut and strut fork inspection (AD 47-30-02, recurring): Same AD as the J-3. Requires periodic inspection of wing strut forks. Terminated by installing sealed struts.
• Fuel system ADs: Similar contamination concerns as the J-3, though the PA-11's revised fuel system (17-gallon wing tank versus the J-3's header tank) reduces some contamination pathways.
• Continental engine ADs: Standard A-65/C-85/C-90 engine ADs. Most are one-time compliance or addressed at overhaul.

Common Problems and Pre-Buy Concerns

Fabric Condition: Same considerations as the J-3. Punch-test thoroughly during pre-buy. Budget $25,000-$40,000 for a complete re-cover if fabric is approaching limits.

Engine Paperwork: Many PA-11s have been re-engined over the decades. Verify that the installed engine matches the logbook entries and that any engine upgrade is properly documented -- either under the TCDS (A-65, C-85, C-90) or via a specific STC (O-200). Incomplete engine paperwork is the most common documentation issue with PA-11s.

Fuselage Tube Corrosion: Same steel-tube construction as the J-3, same corrosion concerns. Inspect belly area, battery tray (if equipped), and tube cluster joints.

Landing Gear Bungees: Periodic replacement required. Worn bungees cause hard landings. Budget for replacement every 5-8 years depending on usage.

Wood vs. Metal Spars: Same consideration as the J-3. Metal spars are preferred for reduced inspection burden.

Fuel Tank Integrity: The PA-11's wing tank is subject to age-related deterioration. Inspect for leaks, seam integrity, and internal corrosion.

PA-11 insurance is priced similarly to J-3 Cub insurance, with minor adjustments for the slightly higher hull values typical of C-90-equipped examples.

Typical Premiums (2025-2026)

Underwriting notes:

• Same tailwheel experience requirements as the J-3.
• Hull values in the PA-11 market have increased faster than some underwriters recognize. Ensure agreed hull value reflects current replacement cost.
• Float operations carry additional premium or may require a separate endorsement.
• MOSAIC sport pilot operations are generally covered at standard rates.

See insurance-underwriting for broader context on GA insurance markets.