Addyman Zephyr
| Zephyr | |
|---|---|
| Role | Single seat sailplane |
| National origin | United Kingdom |
| Manufacturer | E. T. W. Addyman at Harrogate |
| Designer | E. T. W. Addyman |
| First flight | 1933 |
| Number built | 1 |
The Addyman Zephyr was
Design
Erik Addyman designed and built the single seat Zephyr, his first design, in 1933. It was intended as a light wind sailplane, combining a wing of modest aspect ratio with a nacelle cockpit and a truss girder fuselage of the kind more common on primary gliders. It was a wooden structured, largely fabric covered aircraft.[1]
The two spar wing had a straight leading edge and constant chord out to a little over half span, where trailing edge of the ailerons, set at a slight angle to the spar, curved inwards. It was wire braced form above with pairs of wires from the spars to a central, inverted V strut pylon and below by wires to the lower nacelle longerons. There were no flaps or airbrakes. The central wing rib was continued rearward with the the upper member of the open, flat, converging Warren girder fuselage, whose lower member joined the keel of the plywood and fabric covered nacelle just aft of the wing trailing edge. This placed the open single cockpit just forward of the wing leading edge. A central keel skid formed the main undercarriage, with assistance from a tail bumper.[1]
A narrow span, triangular tailplane, wire braced above and below, carried longer span elevators with rounded tips and a cut-out for the deep, rounded rudder hinged to small, triangular fin.[1]
Operational history
Specifications
Data from Ellison[1]
General characteristics
- Crew: 1
- Length: 18 ft 6 in (5.64 m)
- Wingspan: 41 ft 9 in (12.73 m)
- Wing area: 195.0 sq ft (18.12 m2)
- Aspect ratio: 9.5
- Empty weight: 185 lb (84 kg)
References