Boeing Model 4 EA

Two Boeing Model 4 aircraft, a reworked version of the Model 3, were built in January 1917. Known under the alternate designation EA (possibly E for Boeing’s fifth design, A for Army), they were developed for evaluation by the U.S. Army as trainer aircraft.

Key Design Innovations

The most significant difference from the Model 3 was the replacement of the float-type landing gear with a wheeled chassis. These machines were also equipped with a shared cockpit, accommodating two pilots seated side-by-side.

Advanced Propulsion

The Model 4 marked a significant milestone for Boeing. It was the firm’s first aircraft to be fitted with the more reliable Curtiss OXX series engine, enhancing its performance and suitability for training operations.

Technical Specifications

Modification	Model 4
Wingspan, m	14.88
Length, m	7.57
Wing area, m2	44.50
Empty weight	725
Maximum takeoff weight	991
Engine type	1 Piston engine Curtiss OXX-5
Power, hp	1 x 100
Maximum speed, km/h	108
Cruising speed, km/h	97
Practical range, km	519
Service ceiling, m	2134
Crew, crew	2

Image and diagram gallery of the Boeing Model 4 EA

Boeing Model 4 EA

Boeing Model 4 EA