De Havilland "Dingo" (Bristol "Jupiter" or Siddeley "Jaguar"). The De Havilland "Dingo," or D.H.42, is one of the recent experimental productions of the de Havilland firm, built to Air Ministry specification. Bearing the typical "D.H." stamp, but embodying several distinctive features, the "Dingo" was designed as a two-seater fighter of the tractor fuselage biplane type. It can be fitted either with the Bristol "Jupiter" or the Siddeley "Jaguar" engine. The top plane has a. slightly larger chord than has the lower one - a novelty in D.H. design - and the pilot sits immediately below it, a circular hole being cut in the centre to provide upward vision.
De Havilland "Stag" (Bristol "Jupiter VI"). Fitted with the 450 h.p. Mark VI Bristol "Jupiter" engine, the D.H. "Stag" has an exceedingly good performance, and may be described as a general-purpose military two-seater tractor biplane, being particularly suitable for reconnaissance work, and also for Army co-operation, bombing, photography, etc. It has a range of five or six hours' duration. The "Stag" is generally similar to the D.H.9; in fact, it may be said that aft of the main planes it is standard D.H.9 practice, the rest being new.
De Havilland "Hyena" (Armstrong Siddeley "Jaguar") Designed to the same specification as the other Army co-operation machines, the de Havilland "Hyena" retains its typical de Havilland lines, and especially does it resemble the famous D.H.9A, except for such rather drastic changes as the substitution of a radial air-cooled engine for the water-cooled "Liberty" of the 9A, and the fitting of a lower plane of considerably smaller chord than the top. The cowling of the "Jaguar" engine has been carried out with considerable care, and the undercarriage is of more modern design than that of the 9A, being of the type in which rubber blocks are used working in compression.