Cloudcraft Dickson Primary

Dickson Primary
Role	Single seat primary glider
National origin	United Kingdom
Manufacturer	Cloudcraft Glider Co., Southampton
Designer	Roger S. Dickson
First flight	1930
Number built	c.30?

The Cloudcraft Dickson Primary was a single-seat primary glider designed in the United Kingdom in 1930 to be constructed from plans. Many glider clubs in the UK and the British Empire flew them in the 1930s.

Design and development

Like other primary gliders of the 1930s, the Dickson Primary was aerodynamically unambitious, with its emphasis on low cost and simplicity. It was a wooden high wing aircraft, carrying the pilot on an open seat with a largely open, flat truss girder fuselage behind.^[1]

The wing had a two-spar fabric covered structure and was completely rectangular in plan. Ailerons occupied approximately ⅓ of the outer trailing edge. The wing was mounted on the horizontal upper beam of the three-bay fuselage Warren girder. The lower beam, angled slightly upwards rearwards, carried the pilot's seat and controls at its forward end. On each side V-shaped lift struts linked the upper fuselage structure to the two wing spars at about ¼ span. Pairs of landing wires ran from a longitudinally-orientated inverted V-shaped pylon above the centre of the upper wing to the two spars near the inboard edge of the aileron. Similarly arranged flying wires ran from the same wing points to the keel. Bracing wires from the rear spar, at the same point as the flying wires, were anchored to the lower rear corner of the flat fuselage girder to limit sideways flexing.^[1]

The seat and exposed control column were located just ahead of the wing leading edge. A simple skid acted as undercarriage. At the rear, a fabric-covered tailplane, with swept leading edges and carrying rectangular elevators, was mounted on the upper fuselage beam over the whole of the aft fuselage bay. The rearmost vertical member of the girder carried a near-rectangular rudder, which projected above the fuselage led by a slender fin. Lateral stability was enhanced by the fabric covering of the rear bay of the fuselage.^[1]

The Dickson Primary flew for the first time in 1930.

Operational history

Only nine Dickson Primarys have established individual identities.^[1] However, a Cloudcraft advertisement from July 1931 claimed that there were "over one hundred in use at the present time" in the UK, USA, Australia, New Zealand and South Africa.^[2] Some of these may have been built from kits, others from plans published in books and in or by magazines like Flight or bought from Cloudcraft.^[1] Certainly one example was built and flying in New Zealand by March 1931.^[3] UK gliding clubs (GC) flying Dickson Primarys included the London GC,^[4] operating at Dunstable, the Southampton GC^[5] and the Stockport GC. The last built their Dickson from plans.^[6] Seven years after the first flight, full working drawings were still on offer for 30/- (£1.50) from Flight itself,^[7] as they had been in 1931.^[3]

Aircraft on display

In 2010 a reproduction Dickson Primary was on display at the Old Rhinebeck Aerodrome, New York.^[8] The remains of an original aircraft are in storage in the UK.^[9]

Specifications (Dickson Primary)

Data from Ellison^[1]

General characteristics

• Crew: 1
• Length: 17 ft 4 in (5.28 m)
• Wingspan: 34 ft 3 in (10.45 m)
• Wing area: 170.0 sq ft (15.79 m²)
• Aspect ratio: 7.0
• Airfoil: Clark Y-H
• Empty weight: 180 lb (82 kg)

See also

Aircraft of comparable role, configuration and era

Other primary gliders from the early 1930s were:

• B.A.C. II
• Stamer Lippisch SG-38 Zögling

plus many Zögling clones.

References

1. ^ ^{a b c d e f} Ellison, Norman (1971). British Gliders and Sailplanes. London: A & C Black Ltd. pp. 99, 245. ISBN 0 7136 1189 8 5. 
2. ^ "Cloudcraft advertisement". Sailplane and Glider 2 (1): p.7. July 1931. http://www.lakesgc.co.uk/mainwebpages/Sailplane%20&%20Glider%201930%20-%201955/Volume%202%20No.%201%20Jul%2017%201931.pdf. 
3. ^ ^{a b} "Gliding". Flight (6 March 1931): p.203. http://www.flightglobal.com/pdfarchive/view/1931/1931%20-%200219.html. 
4. ^ "London Gliding Club". Flight (25 March 1932): p.261. http://www.flightglobal.com/pdfarchive/view/1932/1932%20-%200285.html. 
5. ^ "Southampton Gliding Club". Flight (23 January 1931): p.78. http://www.flightglobal.com/pdfarchive/view/1931/1931%20-%200076.html. 
6. ^ "Stockport Gliding Club". Flight (21 November 1930): p.1261. http://www.flightglobal.com/pdfarchive/view/1930/untitled0%20-%201333.html. 
7. ^ "Flight advertisement". Flight (13 May 1937): p.20. http://www.flightglobal.com/pdfarchive/view/1937/1937%20-%201302.html. 
8. ^ Ogden, Bob (2011). Air Museums and Collections of North America (2 ed.). Air-Britain (Historians) Ltd. p. 445. ISBN 978 0 85130 427 4. 
9. ^ Ellis, Ken (2010). Wrecks & Relics (22 ed.). Manchester: Crecy. p. 265. ISBN 9 780859 791502.