Cramlington Cramcraft

Cramcraft
Role Basic training glider
National origin United Kingdom
Manufacturer Cramlington Aircraft Co., Northumberland
First flight c.5 October 1930
Number built c.3
Unit cost
£55 in 1930

The Cramlington Cramcraft was a simple, single-seat, primary training glider, designed in the United Kingdom in 1930. About three were built.

Design and development

The Cramcraft was a single-seat primary glider trainer, aimed at newcomers to the sport and designed with simplicity, robustness and low cost in mind rather than aerodynamic performance.[1] It was a wooden aircraft with wings of rectangular planform built around two box spars which, like the ribs, were made from spruce and plywood.[2] Ailerons reached to the wing tips but no airbrakes were fitted.[1] The tail surfaces were carried on a narrow, flat boom formed by two parallel beams from the wing leading edge, braced together and fabric covered.[2] Both the boom-mounted tailplane and elevators it carried were rectangular in plan, though the latter had a cutout for rudder movement and extended beyond the tailplane.[1] The rudder was mounted on a very narrow fin and initially extended further below the boom than above[1] but was later modified so that little projected below and the upper profile became more rounded.[3]

Initially the pilot's seat was mounted well below the wing leading edge on the narrow edge of a board or plank.[1][4] The under edge of this board was shaped to curve up forwards and served as a skid. The board was fixed to the wing spars by two pairs of parallel V-form lift struts, the angle between them being unusually small.[1] This arrangement left the pilot completely exposed and a later version placed him in a short nacelle.[3] Both wings and tail were further wire braced, with lift wires from the fuselage and above from a pair of inverted V-struts mounted on the two boom beams.[1]

Operational history

The first serious testing was on 5 October 1930. Several pilots flew the Cramcraft, though no flights of more than 30 seconds were achieved that day.[5] It is probable that three Cramcrafts were built, at least one of them flying with the Newcastle gliding club and another with the Sunderland club, both near to Cramlington.[1]

Specifications (early version)

Data from Ellison[1]

General characteristics



References

  1. 1 2 3 4 5 6 7 8 9 Ellison, Norman (1971). British Gliders and Sailplanes. London: A & C Black Ltd. pp. 102, 245. ISBN 978-0-7136-1189-2.
  2. 1 2 "A North Country glider" (PDF). Sailplane and Glider 1 (5): 36. 3 October 1930.
  3. 1 2 "The Latest Cramcraft" (PDF). Sailplane and Glider 2 (1): 11. 17 July 1931.
  4. "Cramlington advertisement" (PDF). Sailplane and Glider 1 (7): 51. 3 October 1930.
  5. "More news about the Cramcraft" (PDF). Sailplane and Glider 1 (7): 54. 17 October 1930.
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