Aston Martin Atom

Aston Martin Atom
Overview
ManufacturerAston Martin
Production1939–1940
DesignerClaude Hill
Body and chassis
ClassPrototype grand tourer
Body style4 door saloon
LayoutFR
Powertrain
Engine2.0 L (122 cu in) I4
TransmissionSemi-automatic Cotal preselector
Dimensions
Wheelbase102 in (2,591 mm)
Kerb weight24 long cwt (2,700 lb or 1,200 kg)

The Aston Martin Atom is a prototype automobile built by Aston Martin (AM). Construction of the car began in 1939 and was completed in 1940. The Atom is one of the first fully functional concept cars ever built.[1][2] Aston Martin explored several new technologies with the Atom, and its chassis design was the basis for the platform used by AM's post-war models well into the late 1950s.[1]

History

Construction of the Atom was commissioned by R. Gordon Sutherland, AM's Managing Director and son of Arthur Sutherland, the company's owner.[3] Chief engineer Claude Hill led the design effort.[4][5]

The goal was to produce a small enclosed saloon that was comfortable and possessed good road manners.[1] To meet that goal, emphasis was put on light weight and a rigid chassis.[6][7] The car's name was chosen to be evocative of something small but powerful.[8]

The Atom broke with traditional body-on-frame construction methods. Its chassis used square and rectangular cross-section steel tubing for both the main chassis and the support framework for the body.[5] This was a continuation of Hill's earlier experiments with a prototype built on chassis J6.403.LS, registered as EML 132, and known informally at the works as Donald Duck.[9][10]

The Atom was built on chassis G40/900.[2] It was originally powered by the same type of engine used in the model 15/98.[4] After World War II (WWII) that engine was replaced by EN4/48/2, an instance of the new four-cylinder engine that would later power the Aston Martin 2-Litre Sports model.

Aston Martin and Hill applied for twenty-seven patents on technologies developed for the Atom, including ones related to the body, chassis, and engine.[11][8]

A Road Tax disc was issued for the car by the Department of Transport on 14 July 1940.[8] It was registered as LMF 386.[2][12]

The Atom appeared at the Chessington Rally in 1941.[2][13]

It is reported that David Brown decided to buy the Aston Martin company after having driven the Atom in 1947.[1][14]

The Atom's chassis design was adapted for use in the 2-Litre Sports by the addition of extra bracing needed to compensate for the loss of stiffness due to the new model's drophead coupé body.[15]: 25  The same basic chassis would later be adapted for the DB2, the DB2/4, and the DB2/4 MkIII, staying in production until 1959.[4][5] This lineage ended with the release of the DB4.[16]

Sutherland kept the Atom as a personal vehicle after the sale of the factory to Brown, putting about 100,000 mi (161,000 km) on the car before selling it in 1949.[8][17] In 1951 the Atom was owned by C.F. Mayo, and by 1953 the car had become the property of Bob Gathercole, godson of W. O. Bentley.[1] In 1965, after some other intermediate owners, the Atom was bought by ex-Aston racing driver Nigel Mann, who kept the car in France until 1986, when it was purchased by Tom Rollason, who repatriated it to the UK where it underwent a full restoration.[8]

In June 2014 the Atom was put up for auction by Bonhams at the Goodwood Festival of Speed.[17] Bidding did not reach the reserve and there was no sale.[5] By the time of this auction the car had been driven 250,000 mi (402,336 km).[18][2]

While the Buick Y-Job is often described as the first ever concept car, the Atom debuted just months after the Buick.[17] The Atom is considered to have been Europe's first concept car.[19]

Features

Body and chassis

Rear three-quarter view.

The chassis of the Atom has been called a "skeleton frame", a "tubular monocoque", a "tubular unitary body", and a "space frame".[20][21][22][23] It consists of a box frame built with 2½" x 1¼" 13 gauge rectangular mild steel tubing, with an upper structure to support the body and additional bracing made from 1¼"x 1¼" 18 gauge square section tubing.[8]

The car's unstressed aluminium bodywork is attached using a combination of self-tapping screws and bolts paired with Nyloc nuts.[3][8] Both the car's shape and construction methods reflect the influence of contemporary aircraft methods.[8][24] The body shape is of a streamlined four door saloon, with both front and rear doors hinged on the B-pillar. The windscreen is of two pieces of flat glass that meet at a centre joint. Instead of a separate grille, cooling air is admitted through a series of twenty-four vertical slits in the front bodywork, increasing in height as they converge towards the car's centreline.

Elements of the car's aircraft influence can also be seen in its hammock-style front seats on the interior and its delta-wing-shaped bonnet release.[24][12]

Running gear

The Atom was the first ever Aston Martin with an independent front suspension.[14][15]: 20  The system is based on a design patented by F. G. Gordon Armstrong of the Armstrong Shock Absorber Company, and as adapted by Hill comprises twin trailing arms, coil springs and Armstrong lever dampers with split track rods.[8][1]

In 1919 the Salisbury Axle Company was acquired by the Spicer Manufacturing Corporation (later Dana Incorporated).[25] The Atom is the first British car to be fitted with a Salisbury rear axle with hypoid bevel gears and a carrier-style differential axle housing.[18][2] The Salisbury axle allowed the car's propeller shaft to be 2 in (51 mm) lower than it would have otherwise been, reducing its intrusion into available interior space.[1][15]: 20  The rear axle is suspended on semi-elliptical leaf springs in a Hotchkiss drive system. Rear dampers are Armstrong lever arm units.[1]

Brakes front and rear are 12 in (305 mm) Lockheed drums.[1] The car's 5.50 × 17" tyres are mounted on 17 in × 2.75 in (432 mm × 70 mm) Rudge-Whitworth knock-on wire wheels.[8]

Drivetrain

Cotal transmission diagram.

The Atom's original engine was a single overhead camshaft (SOHC) inline four designed by Hill.[26] With a bore of 78 mm (3.07 in) and stroke of 102 mm (4.02 in), it displaced 1,949 cc (118.9 cu in). It was fitted with dual Zenith carburettors.[12] This 2.0 L design was the successor to an earlier 1.5 L SOHC Aston Martin engine developed in or around 1930 for the R&B car by A C Bertelli and William Renwick along with Hill.[27][28][29] Hill started work on the 2.0 L engine in 1935. While still a SOHC inline-four, it shared almost no parts with the earlier 1.5 L unit.[9][26] The 2.0 L was fitted to Speed Model cars in 1936.[9][30][31][15]: 15 

In 1944 the Atom's SOHC engine was replaced by a new overhead valve (OHV) four cylinder also designed by Hill. The bore × stroke of this engine are 82.6 mm × 92 mm (3.25 in × 3.62 in) respectively, for a swept volume of 1,972 cc (120.3 cu in). This engine is fed by two SU carburettors.[12] Patents were granted for the 2.0 L engine in 1945.[8]

The transmission in the Atom is a semi-automatic Cotal preselector.[8] This transmission uses electromagnets to engage the gears, and provides the same four ratios and, potentially, speed in the reverse direction as the forward.[32][8] The car has two controls for the transmission; a floor lever that selects forward, neutral, or reverse, and a small lever in an H-shaped gate mounted under the fascia that the driver uses to select the desired gear.[1]

References

  1. ^ a b c d e f g h i j McFadyen, Peter (May 2020). "Aston Martin Atom". Classic and Competition Car. No. 116. pp. 30–35.
  2. ^ a b c d e f "Lot 357 — 1939-40 Aston Martin Atom Factory Prototype Concept Car". Bonhams. 27 June 2014.
  3. ^ a b Boddy, William (April 1949). "An interview with Claude Hill, designer of the post-war Aston-Martin, which won the 1948 Spa 24-hour race". Motor Sport. pp. 121–122.
  4. ^ a b c Cottingham, Tim. "The Atom". Aston Martins.com. Retrieved 9 December 2020.
  5. ^ a b c d Matthews, Nigel (24 July 2014). "Aston Martin: Atom's Design was no small step". Hagerty.
  6. ^ Ward, Seán (11 August 2020). "The seven best Aston Martin concepts ever". Goodwoods.
  7. ^ Evans, John (25 June 2014). "News: "World's rarest" Aston Martin could fetch £1m as Atom auctioned at Goodwood". The Sunday Times.
  8. ^ a b c d e f g h i j k l m "Sutherland Aston Martin, 1936-1940 — The Atom". Ecurie Bertelli Ltd. 2017.
  9. ^ a b c King, Tom (14 June 2014). "Aston Martin Before Bentley" (PDF). NEW ZEALAND ROLLS-ROYCE & BENTLEY CLUB (INC). New Zealand Rolls-Royce & Bentley Club Inc. pp. 13–18.
  10. ^ Reek, Felix (30 September 2014). "Rentenmodell aus Entenhausen" [Pension Model from Duckberg]. Süddeutsche Zeitung (in German).
  11. ^ Bonnafous, Gilles (14 November 2006). "Histoire: Historique Aston Martin avant-guerre" [Story: Historic pre-war Aston Martin]. Motorlegend (in French).
  12. ^ a b c d van der Zeeuw, Martin (22 February 2019). "1939 Aston Martin Atom". Drive-My.
  13. ^ "ON THE CHESSINGTON RALLY". Motor Sport. August 1941.
  14. ^ a b Ernst, Kurt (28 March 2014). "Influential Aston Martin Atom concept heads to auction". Hemmings.
  15. ^ a b c d Noakes, Andrew (3 September 2019). Aston Martin DB: 70 Years. White Lion Publishing. ISBN 978-1781319284.
  16. ^ "Aston Martin DB4 'series 3' sports Saloon" (PDF). The Aston Martin Sale. Bonhams. 17 May 2014. p. 134.
  17. ^ a b c "The ex-Gordon Sutherland, experimental one-off 1939-40 Aston Martin Atom Factory Prototype Concept Car" (PDF). Goodwood Festival of Speed Sale. Bonhams. 27 June 2014.
  18. ^ a b MacLeman, Greg (27 March 2014). "World's rarest Aston Martin put up for sale". Classic & Sports Car.
  19. ^ English, Andrew (27 June 2014). "Goodwood Festival of Speed 2014: Aston Martin Atom". The Telegraph.
  20. ^ Page, James (26 August 2019). "The 10 weirdest and wildest Aston Martins ever". Classic & Sports Car.
  21. ^ Kupélian, Yvette; Kupélian, Jacques (13 February 2008). "Aston Martin Story". Automanie.net (in French).
  22. ^ Moon, Capt. John (September 1943). "A design for a 1 1/2-litre post war sports car". Motor Sport. pp. 176–180.
  23. ^ Hyams, Jacky (30 August 2018). "The making of Aston Martin". Express.
  24. ^ a b Tongue, Andy (5 July 2014). "Back to the Future - The Aston Martin Atom". Aston Martin.
  25. ^ Raber, Michael S.; Boesch, Eugene J. "SPICER MANUFACTURING COMPANY, SOUTH PLAINFIELDWORKS" (PDF). Historic American Engineering Record.
  26. ^ a b McCourt, Mark J. (November 2014). "Aston Martin 15/98". Hemmings Motor News.
  27. ^ "Introduction — Renwick and Bertelli". Ecurie Bertelli Ltd. 2017.
  28. ^ "1940 Aston Martin Speed Model Type C". Mecum Auctions. 15–17 August 2019.
  29. ^ Bell, Jonathan (December 2016). "Engines of Change: Revealing the Power Behind Sports Cars". Aston Martin. Archived from the original on 18 May 2019. Retrieved 15 December 2020.
  30. ^ Georgano, Nick, ed. (2001). "Aston-Martin". The Beaulieu Encyclopedia of the Automobile — A–F. Vol. 1 (2nd ed.). Chicago, Illinois: Fitzroy Dearborn Publishers. pp. 83–90. ISBN 1-57958-293-1.
  31. ^ "1940 Aston Martin Speed Model Type C". RM Sotheby's. 13–16 August 2015.
  32. ^ "An Electrically Controlled Gearbox". Commercial Motor. 3 May 1935. Retrieved 14 December 2020.
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