O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
Alter Type A I
Single seat "Nieuport type" machine produced by Ludwig Alter Werke, Darmstadt. Engine, probably Oberursel U II 120 h.p.
W.Green, G.Swanborough The Complete Book of Fighters
ALTER A.l Germany
Conceptually adhering closely to the Nie 11 Bebe if not an outright copy of the French design, the A.l single-seat fighter, designed by Kallweit and Ketterer and built by the Ludwig Alter-Werke of Darmstadt, was first flown in February 1917 by Georg Sell. A single-bay sesquiplane with I-type interplane struts, the A.l was of wooden construction with fabric and plywood covering. Armament consisted of two synchronised 7,92-mm LMG 08/15 machine guns and power was provided by a 110 hp Goebel Goe II seven-cylinder rotary engine. The A.l was demonstrated to the Idflieg (Inspektion der Fliegertruppe), but the type was rejected, performance being considered inadequate and the structure being viewed as insufficiently robust, further development being discontinued.
Max speed, 110 mph (177km/h).
Time to 9,840 ft (3000m), 12.8min.
Loaded weight, 1,124 lb (510 kg).