Avro 534, 543 and 554 Baby

Single seat sports equal span, single bay biplane of wire braced fabric covered wooden construction. The fuselage, of rectangular section with an arched deck fairing, was of the conventional girder type, with longerons and struts of spruce and aluminium covering forward of the cockpit. The balance area of the 'comma' rudder was increased slightly to make it an accurate circle and there was no fixed fin. The main wing spars were of built-up box section, while the leading edge was of wood spindled out to a U section. The wing tips and the trailing edges were of steel tubes. The wing ribs were of the wood girder type, with box girder ribs taking the compression load imposed by the internal drag bracing. Ailerons were fitted to both top and bottom planes. One 35 h.p. Green powerplant.
Following a crash, the second Type 534 was modified to include a raised tailplane, tapered ailerons, a slightly taller, oval shaped rudder, a new oil tank without projecting filler cap, more streamlined inter plane struts and the pitot head repositioned on the top wing. These modifications were incorporated on all subsequent aircraft.

Twin float seaplane version of Type 534 with an unbalanced rudder hinged to a large fin, and a slight reduction in lower mainplane span which imparted a slant to the interplane struts.

As Type 534 with plywood covered fuselage, the reduced span lower wing of the Type 534 and return to the perfectly circular rudder.

Racing version of Type 534 with reduced span on both wings.

Tropical version of type 534, with all-steel engine bearers, oversize radiator, extra cowling louvres, slightly taller undercarriage, and a luggage locker behind the pilot's seat. Built to the orders of Col. E. Villiers.

Type 534 Baby Specification
Span	Length	Height	Wing Area	Empty Wt	Max AUW	Cruise Speed	Maximum Speed	Range	Service Ceiling
25 ft	17 ft 6 in	7 ft 6 in	180 sq ft	625 lb	857 lb	70 mph/ 61 kn	78 mph/ 68 kn	240 mi
7.62 m	5.33 m	2.29 m	16.72 m2	283 kg	389 kg	113 km/h	126 km/h	386 km

Two seat variant of type 534, housing pilot and passenger in an enlarged single cockpit. It was otherwise a standard Baby with the front fuselage lengthened by 2 ft. 6 in. One 35 h.p. Green and later 60 h.p. ADC Cirrus I powerplant.

Two seat photgraphic survey development of the projected Type 544. Limited shipboard stowage space called for swift dismantling and erection by gloved hands without rigging problems. Tubular steel struts therefore replaced flying wires, N-type interplane struts were used, and all bolts were extra large. One 80 hp Le Rhone powerplant.