Airspeed AS-4 Ferry
This was a multi engined
airliner to requirements of Sir Alan Cobham. The wings were equal span,
three bay, unstaggered, unswept biplane configuration. Wings were of
constant chord. Lower wing is cranked to shorten undercarriage leg.
Construction of wood with fabric covering. Ailerons on all four wings.
Wings braced from engine mount to lower fuselage. The fuselage under the
lower wing was box section monocoque of spruce and of plywood
construction. The pilot was in an enclosed cockpit in the nose with an
enclosed cabin for 10 passengers behind.
Two 120 hp de Havilland Gipsy II four cylinder upright engines on lower
wing either side of the cabin and one inverted 120 hp de Havilland Gipsy
III engine in centre of upper wing
Length:39 ft 8 in
Height:14 ft 3 in
Wing Area:641 sq ft
Empty weight:3,440 lb
Loaded weight:5,600 lb
Max Speed:108 mph at sea level
Initial Rate of Climb:520 ft/min
Absolute Ceiling:13,000 ft