Piper J-4

The Piper J-4 Cub Coupe is a tandem two-seat light aircraft produced by Piper Aircraft starting in 1938. It was conceived as a more refined and comfortable version of the Piper J-3 Cub, offering an enclosed cabin and improved amenities. The J-4 retains the high-wing configuration characteristic of the Cub family.

The design differed significantly from the J-3 in that it featured a closed cabin with side-by-side seating for the pilot and passenger, as opposed to the J-3's tandem open cockpit or enclosed but less comfortable arrangement. This made the J-4 more appealing for cross-country flying and passenger comfort. It was typically powered by a Continental A-50 or A-65 engine.

Production ceased during World War II, and after the war, Piper focused on the J-3 and later, more modern designs. The J-4, while popular in its time, did not achieve the same iconic status or production numbers as the J-3. Surviving J-4s are considered classic light aircraft and are often restored and flown by enthusiasts.