Travel Air "Curtis Wright"
Travel Air 4000
First Flight 13 March 1925 Introduction 1925

The Travel Air 4000 is an American general-purpose biplane of the 1920s, a member of the family of aircraft that began with the Travel Air Model A.[1] It was later known as the Model 4. Derived from the Model BW, around 100 were built, including two that were converted from Model 2000s

Design and development Like other members of this family, the Model 4000 is an unequal-span, single-bay, staggered biplane of conventional design] The passengers and pilot sit in tandem, open cockpits. It has a conventional tail, and fixed, tailskid undercarriage. The fuselage is built from welded steel tubes, and the wings from wood. Travel Air model numbers primarily reflected changes in powerplant, and the Model 4000 was originally powered by a Wright J-5 or J-4 radial engine mounted in the nose, driving a tractor propeller.From late 1928 onwards, however, the Model 4000 and Model 4 designations were applied to aircraft powered by a wide variety of other air-cooled radial engines

TTravel Air built fourteen Model 4000s in 1927, and the design received type certificate ATC-32 in April 1928. Most Model BWs were registered under the same type certificate.

Starting with the Model B-4000, some variants had a new "outrigger" style undercarriage, where oleo struts were attached outboard of the main undercarriage units, connected to struts forward of the lower wing

Travel Air D-4000 on display at the Kansas Aviation Museum.

Model 4000 variants are distinguished by changes in their wing type and powerplant, although other characteristics such as undercarriage changes or roles such as mailplane or aerial spraying are sometimes also reflected in the model numbers.

The wing types are as follows:

 Wiki Link