 The Type E biplane was designed in parallel with the slightly earlier Avro Duigan, differing principally in being slightly larger and having a more powerful () water-cooled E.N.V.engine.Both were two-bay tractor biplanes with unstaggered parallel-chord wings with rounded tips, a deep rectangular section fuselage bearing rectangular steel-framed stabilisers, elevators and rudder with no fixed fin, and an undercarriage with a pair of wheels on a transverse leaf-spring and a long central skid projecting forward of the propeller.