Hi Chaps i think No 22 is a Pfalz.DIIIa
Prior to World War I, Pfalz Flugzeugwerke produced Morane-Saulnier monoplane designs under license.[1] These aircraft entered military service as the Pfalz A- and E-series. In September 1916, Pfalz began producing the first of 20 Roland D.I and 200 Roland D.II fighters under license.[2]
In November 1916, Pfalz hired Rudolph Gehringer from Flugzeugbau Friedrichshafen GmbH.[3] As Pfalz’s new chief engineer, Gehringer immediately commenced work on an original fighter design. The resulting D.III emerged in April 1917. Like the Rolands, the D.III used a plywood monocoque fuselage. Two layers of thin plywood strips were placed over a mold to form one half of a fuselage shell.[4] The fuselage halves were then glued together, covered with a layer of fabric, and doped. This Wickelrumpf method gave the fuselage great strength, light weight, and smooth contours compared to conventional construction techniques.[4] However, it also proved to be more labor intensive and expensive. Furthermore, the D.III fuselage was prone to twisting or warping from side to side as it aged,[5] a defect variously attributed to the use of insufficiently seasoned wood or to moisture absorption in damp conditions.
The wings were of conventional construction, with a flush Teeves and Braun radiator offset to the right side of the upper wing. The ailerons were of wooden construction, rather than the more conventional steel tube construction.[6] The horizontal stabilizer had an inverted airfoil section, which facilitated dive recovery and permitted the use of an unbalanced elevator.[6]
The Idflieg found the prototype promising. It directed Pfalz to halt production of the Roland D.III and to complete the balance of the contract, 70 aircraft, to the new design.[3] After a Typenprüfung (type test) at Adlershof in May, the Idflieg ordered various modifications, including an enlarged rudder and horn-balanced ailerons.[7] In June 1917, Pfalz received a second order for 300 aircraft.[7]