Main Menu

Piper J-4 Cub Coupe / L-4E


Piper introduced the Cub Coupe in 1938 and it went into production the next year, gaining immediate popularity, particularly with pilot sports who liked to take their gals for a ride and hold hands side-by-side. It came out with, wheel pants, full-swivel tailwheel, oleo gear in the undercarriage, and even an airspeed indicator. It had a small increase in wing span and introduced improved landing gear with a fully-castoring tailwheel, and hydraulic brakes. As powered initially by a 37kW Continental A50-1 it had the designation J-4.

The J-4 Coupe was developed and introduced shortly after Taylor brought out his highly successful Taylorcraft Model B side-by-side two seater. Taylor had designed the Piper Cub, and when he split with Piper he decided to offer an airplane better than the Cub was. Piper engineers countered with the J-4 and the market was offered the choice between two airplanes of generally similar configuration.

The initial Coupes were plush inside, upholstered in suede cloth and leather. Elevator tab control and indicator were put up in the ceiling, in front of the pilot's head where you could see whether you were winding the nose up or down.

In 1939 Piper introduced the J-4B, differing only in powerplant which initially, was a 45kW Franklin 4AC-171, but that was soon replaced by the 48kW Franklin 4AC-176-B2 without any change in designation.
Introduction of the 56kW Continental A75-9 brought redesignation as the J-4E.

Last of the J-4s was the version powered by Avco Lycoming engines, the 41kW O-145-A1 or -A2, or 48kW O-145-B1, both of these Cub Coupes having the designation J-4F.

By 1941, with production rolling on the Coupe, Piper's 70-horsepower version came out with. increased speed, range, and altitude, and sold at $2,395, only $799 down, with a free flying course including eight hours of dual time thrown in so you could fly your toy home from Lock Haven all by yourself - hopefully.

This was a step forward from originally published claims for the Cub Coupe, which sold in 1938 for $1,995, only $665 down with a free catalog thrown in. Announced Piper: "Get this luxurious 1939 Cub Coupe and you've got everything! Here's a plane that's complete in every detail. Nothing more to buy!"

Production of J-4s reached 1,250 by 1942, and during World War II 17 J-4Es were impressed for service with the USAAF under the designation L-4E.


Harry Garland's J-4A Cub NC30815 on the Garland's Seaplane Base ramps facing the Detroit River 1946


Engine: Continental A-50, 50 hp
Span: 36 ft 7 in
Length: 22 ft 6 in
Height: 6 ft 10 in
Empty wt: 710 lb
Gross weight: 1,200 lb
Top speed: 93 mph
Cruising speed: 83 mph
Landing speed: 35 mph
Cruising range: 340 miles
Climb first minute: 500 fpm
Service ceiling: 12,000 ft
Seats: 2


Engine: Continental. 55 hp

J4A-65 Cub-Coupe
Engine: Continental A65-8, 65 hp

Piper J-4F
Engine: 1 x Avco Lycoming O-145-B1, 48kW
Max take-off weight: 590 kg / 1301 lb
Empty weight: 336 kg / 741 lb
Wingspan: 11.02 m / 36 ft 2 in
Length: 6.86 m / 23 ft 6 in
Height: 2.08 m / 7 ft 10 in
Wing area: 17.00 sq.m / 182.99 sq ft
Max. speed: 161 km/h / 100 mph
Ceiling: 3660 m / 12000 ft
Range: 547 km / 340 miles



Copyright © 2021 all-aero. All Rights Reserved.
Joomla! is Free Software released under the GNU General Public License.