More American pilots learned to fly in a Cub than in any other airplane of its era.
Piper built the tandem two-seat taildragger in Lock Haven, Pennsylvania, from 1938 to 1947, and its fabric-covered steel-tube airframe, 65 hp Continental and 39 mph landing speed made it the trainer of choice for the Civilian Pilot Training Program and, as the L-4 Grasshopper, the US Army’s eyes over the battlefield.
Nearly 20,000 were built. Thousands still fly from grass strips, floats and skis, and the Museum of Flight is one of many collections that keep an original on display. The type runs on 8.00-4 main gear tires and a small solid tail wheel tire, both still in production.
Piper J-3 Cub Specifications
Figures are for the J3C-65, the definitive production model, from Jane’s All the World’s Aircraft and FAA Aircraft Specification A-691.
| Manufacturer | Piper Aircraft Corporation (Lock Haven, Pennsylvania) |
| Type | Two-seat tandem light trainer and utility aircraft, conventional gear |
| First flight | 1937 (J-3 prototype) |
| Certification | Aircraft Specification A-691; J3C-40 and J3C-50 approved July 14, 1938; J3C-65 approved July 6, 1939 |
| Production status | Out of production; ended 1947 |
| Units built | Nearly 20,000 US-built, including more than 5,400 L-4 and NE military variants |
| Engine(s) | 1x Continental A-65-8 flat-four, 65 hp at 2,300 rpm; A-75, A-85, C-85 and A-90 engines also approved for the J3C-65 |
| Max range | About 200 mi (174nm / 322km) on 12 US gal |
| Cruise speed | 73 mph (63 KTAS); 83 mph max level speed at gross weight |
| Landing speed | 39 mph (34 kt) |
| Max operating altitude | 14,000ft absolute ceiling |
| Rate of climb | 450 ft/min |
| Takeoff distance | 370ft ground run |
| Landing distance | 290ft landing run |
| Max takeoff weight (MTOW) | 1,220 lb (553 kg); 1,100 lb or 1,170 lb on some pre-war serial numbers |
| Empty weight | 680 lb (308 kg) |
| Wingspan / length | 35ft 2.5in (10.72m) / 22ft 4.5in (6.82m) |
| Fuel capacity | 12 US gal (45 L), single tank behind the firewall |
| Passenger capacity | 1 passenger, tandem |
| Crew | 1 pilot; flown solo from the rear seat |
| Price (new) | $995 to $2,461 (1938 to 1947); used examples roughly $30,000 to $135,000 (2026 asking prices) |
| Operating cost | About 4.4 US gal/hr fuel burn at cruise |
Piper J-3 Cub – History and Overview
Development and Background
The Cub started as the Taylor E-2 of 1930, a low-cost trainer built in Bradford, Pennsylvania, with backing from local industrialist William T. Piper. Piper kept the company alive through bankruptcy, and engineer Walter Jamouneau reworked the design into the J-2 in 1936. After fire destroyed the Bradford plant in 1937, production moved to a former silk mill in Lock Haven.
The J-3 that followed was an evolution rather than a new airplane. Jamouneau built the fin into the rear fuselage, gave the rear side window its familiar half-oval shape and replaced the J-2’s tailskid arrangement with a steerable tailwheel linked to the rudder by springs and light chains. Early examples sold for just over $1,000 with a 40 hp Continental.
The Civilian Pilot Training Program made the Cub a national institution. About 75 percent of the program’s 435,165 graduates trained in one, and wartime demand pushed Lock Haven to a rate of one airplane every 20 minutes. According to the San Diego Air & Space Museum, Piper built 5,569 Cubs for the military alone.
Design and Performance
Construction is simple and durable: a welded steel-tube fuselage and tail, spruce-spar wings with aluminum ribs, fabric over the whole airframe, and Vee struts bracing the wing to the lower longerons. There are no flaps, most examples have no electrical system, and the engine is hand-propped with its cylinder heads left exposed outside the cowling. With the fuel tank behind the firewall, the pilot flies solo from the rear seat to keep the center of gravity in limits.
At 1,220 lb gross on 178.5 sq ft of wing, wing loading sits under 7 lb per square foot. Jane’s credits the J3C-65 with a 370ft takeoff run and a 290ft landing roll, figures that still hold up on short grass. Cruise is a leisurely 73 mph on about 4.4 gallons an hour.
Handling is the real draw. Controls are light and honest, the stall is gentle and well signposted, and the narrow speed range forces a pilot to fly with feet and hands rather than instruments, which is exactly why tailwheel instructors still prize the type.
Variants
Model designations follow the engine maker, with an S suffix for seaplane versions.
- J3C-40 and J3C-50: Continental A-40 and A-50 powered versions approved in July 1938; the first J-3s off the Lock Haven line.
- J3C-65: Continental A-65 powered, approved July 6, 1939. The definitive production model and the basis for most surviving aircraft, with A-75, A-85, C-85 and A-90 engines approved on the same type certificate.
- J3F: Franklin 4AC engines from 50 to 65 hp.
- J3L: Lycoming O-145 engines from 50 to 65 hp.
- J3C-65S and other S models: Seaplane versions with float gear; the J3C-65S was approved May 27, 1940.
- L-4 Grasshopper: Military version with a glazed greenhouse cabin for observation, built from 1941 as the O-59 and redesignated L-4 in 1942. The Navy took dual-control NE-1 and NE-2 variants.
- TG-8: Three-seat training glider using the Cub fuselage and wing; 250 built.
Operators
Flight schools under the Civilian Pilot Training Program were the first large-scale operators, and by the end of the war roughly 80 percent of US military pilots had taken their first lessons in Cubs. The Army flew L-4s on artillery spotting, liaison, reconnaissance and casualty evacuation in Europe, and the type served again in Korea. Civilian Cubs flew coastal anti-submarine patrols with the Civil Air Patrol, while today’s fleet belongs to private owners, flying clubs, tailwheel schools and float operators.
Current Status
Production ended in 1947, when the PA-11 Cub Special took over; the PA-18 Super Cub later carried the line into the 1980s. Thousands of J-3s remain registered and airworthy, and Univair supplies replacement structure, landing gear and tailwheel parts for the type. Asking prices in 2026 run from about $30,000 for tired examples to $135,000 for fresh restorations, with most airworthy aircraft trading between $50,000 and $90,000.
The design also lives on in new production. CubCrafters and American Legend both build modernized Cub-style aircraft, and American Legend offers an open-cowl version with the exposed cylinder heads that mark an original J-3.
Piper J-3 Cub Landing Gear and Tires
Landing Gear Configuration
The J-3 sits on fixed conventional gear: two side Vees with half axles hinged at a cabane beneath the fuselage, sprung by rubber bungee cords. Standard main wheels were Hayes 841 units fitted with the 8.00-4 tube-type tyre, stopped by hydraulic expander tube brakes, and the leaf-spring steerable tailwheel carries a small solid tire.
Gear hardware matters for weight as well as handling. Cubs built before serial number 10339 qualify for the 1,220 lb gross weight only with the late-model axle and shock strut assemblies called out in Piper drawings 31472 and 31423, as Univair’s gross weight guide explains. Many aircraft have since been converted to 6 inch wheels and brakes or larger bush tires under STC, and those aircraft follow the STC data rather than the original Hayes specification.
Piper J-3 Cub Tire Specifications
| Main gear tire size | 8.00-4 (original Hayes 841 wheel) |
| Tail wheel tire size | 6.00 x 2 solid (Air Associates assembly); 6 inch solid on Scott-type assemblies |
| Ply rating | 4PR main gear |
| Construction | Bias ply, tube type |
| Tire pressure | Refer to the aircraft maintenance manual |
| Compatible brands | Goodyear, Dunlop (8.00-4 main gear) |
| Part numbers | Goodyear 804C41-1; Dunlop DR12520T |
| STC conversions | 8.00-6 main gear on 6 inch wheel and brake conversions; tundra tires under separate STCs |
Always verify tire size, ply rating and part number against the aircraft’s maintenance manual, current STC data and applicable airworthiness directives before ordering. Serial number, gear configuration and installed modifications can change tire requirements.
Main Gear Tires
The 8.00-4 is a large, low-pressure tire on a small rim, sized for grass and dirt rather than hard runways. At 1,220 lb gross the load per tire is light, so most are replaced for sidewall cracking, cuts or brake flat spots rather than worn tread. Goodyear’s 804C41-1 Aircraft Rib and Dunlop’s DR12520T are both 4-ply tube-type 8.00-4 tires listed for the Cub.
Tail Wheel Tire
Univair’s J-3 parts catalog lists a 6.00 x 2 solid tire on the Air Associates tailwheel, alongside the Scott CST-12 assembly. Maule, Matco and API units are common on today’s fleet, so confirm the installed assembly before ordering a replacement tire. Uneven wear usually points to a worn spindle bushing or poor steering spring rigging rather than the tire itself.
Approved and Compatible Brands
The following main gear tires are listed for the J-3 Cub:
- Goodyear Aircraft Rib 804C41-1: 8.00-4, 4PR, tube type, main gear (original Hayes 841 wheels)
- Dunlop DR12520T: 8.00-4, 4PR, main gear (original Hayes 841 wheels); alternate to the Goodyear 804C41-1
- Goodyear Flight Special II 806C61-5: 8.00-6, 6PR, tube type, main gear; STC wheel conversions only, verify against the STC data
- Michelin Aviator 071-371-0: 8.00-6, 6PR, main gear; STC wheel conversions only, verify against the STC data
Solid tail wheel tires are specific to the tailwheel assembly fitted and are not listed here; match the replacement to the assembly manufacturer’s part number.
Frequently Asked Questions: Piper J-3 Cub
Is the Piper J-3 Cub still in production?
No. Piper built the last J-3 in 1947 and replaced it with the PA-11 Cub Special. Thousands remain airworthy, and 8.00-4 main gear tires and replacement parts are still manufactured for the type.
What are the Piper J-3 Cub specifications?
The J3C-65 has a 65 hp Continental A-65, a 1,220 lb gross weight, 680 lb empty weight, 73 mph cruise and about 200 miles of range on 12 gallons. It seats two in tandem; see the full specifications table above.
What engine does the Piper J-3 Cub use?
Most surviving Cubs are J3C-65s with the 65 hp Continental A-65, and the type certificate also approves A-75, A-85, C-85 and A-90 engines. Franklin-powered J3F and Lycoming-powered J3L models were built in smaller numbers.
What is the range of the Piper J-3 Cub?
About 200 miles (174nm) on 12 US gallons at a 73 mph cruise, with no reserve. Practical legs are closer to two hours once VFR reserves are held.
What is the Piper J-3 Cub price?
New Cubs sold for $995 to $2,461 between 1938 and 1947. In 2026, asking prices run from about $30,000 to $135,000, with most airworthy examples between $50,000 and $90,000 depending on engine, fabric, logbooks and originality.
Where can I find a Piper J-3 Cub for sale?
Listings appear on Trade-A-Plane, Controller and Barnstormers, and on type forums such as J3-Cub.com. A pre-purchase inspection by a mechanic who knows fabric aircraft is essential on an airframe more than 75 years old.
Why is the J-3 Cub flown solo from the back seat?
The fuel tank sits behind the firewall, ahead of the front seat. Flying solo from the rear seat keeps the center of gravity within limits; the PA-11 and later Cubs moved fuel to the wings and allowed solo flight from the front.
What is the Piper J-3 Cub landing distance?
Jane’s gives a 290ft landing run and a 370ft takeoff run for the J3C-65 at gross weight. Distances over a 50ft obstacle are considerably longer, and grass, wind and density altitude all change the numbers.
What tire size does the Piper J-3 Cub use?
Standard Cubs use 8.00-4 main gear tires on Hayes 841 wheels and a small solid tail wheel tire, 6.00 x 2 on the Air Associates assembly. Aircraft converted to 6 inch wheels under STC typically run 8.00-6 main tires; verify against the maintenance manual and STC data for your aircraft.
Which tire brands are approved for the Piper J-3 Cub?
Goodyear’s 804C41-1 Aircraft Rib and Dunlop’s DR12520T are both 8.00-4 4-ply tires listed for the Cub. Goodyear and Michelin 8.00-6 tires fit STC wheel conversions.
How much do Piper J-3 Cub tires cost?
Pricing varies by brand and ply rating. Current pricing appears on the product listings linked in the brands section above.
What is the tire pressure for the Piper J-3 Cub?
Inflation pressure is set by the aircraft maintenance manual or, for converted aircraft, the STC data. The 8.00-4 runs at low pressure by design, so check it cold before every flight.
How long do Piper J-3 Cub tires last?
On grass, a set of 8.00-4 tires often lasts years rather than hundreds of landings. Low-utilization Cubs usually lose tires to age cracking and weather checking before the tread wears out, while paved runways and heavy braking shorten life.
How often should Piper J-3 Cub tires be changed?
Replace at the tread wear limit, or earlier for cuts, bulges, flat spots, sidewall cracking or exposed cord. Tubes should be inspected whenever a tire is changed, and a licensed engineer and the maintenance manual govern the final call.
