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The McMurtry Spéirling is an electric single-seat concept car which was first presented at the Goodwood Festival of Speed in 2021. The car is developed by McMurtry Automotive, a British startup founded in 2016 by Irishman Sir David McMurtry (co-founder and executive chairman of Renishaw plc).[2][3] "Spéirling" means "thunderstorm" in Irish.[4]

McMurtry Spéirling
Overview
ManufacturerMcMurtry Automotive
Production2021
Body and chassis
ClassSports prototype
Body styleFastback
LayoutRR
Powertrain
Electric motorTwin motors
Power outputFan system: at least 60 kW (80.5 hp)
Battery60 kWh (800 V, 75 Ah)[1]
Electric range350 km (WLTP)
Plug-in charging600 kW
Dimensions
Wheelbase2,000 mm (78.7 in)
Length3,200 mm (126.0 in)
Width1,500 mm (59.1 in)
Height1,050 mm (41.3 in)
Curb weightUnder 1,000 kg (2,205 lb)

History


According to McMurtry, the motivation behind the car was to see what could be achieved by taking a step away from road cars and existing racing categories. The concept car is neither type approved for road use nor homologated for racing, but is built to satisfy relevant motorsport safety requirements, with crash structures and a carbon-fibre monocoque chassis with integral rollover protection.

The car was first presented at the Goodwood Festival of Speed on 8–11 July 2021, where it was part of the "Future of Motorsport Power" demonstration run segment, being driven by five-time Le Mans winner Derek Bell. Before this, the car had been developed in secrecy over three years.

Following the 2021 Goodwood Festival of Speed, McMurtry announced that they would attempt to beat several world records with the Spéirling.

On 26 June 2022, the Spéirling achieved a new Goodwood Festival of Speed hill climb record, completing the 1.87-kilometre (1.16 mi) course in 39.08 seconds with McMurtry test driver Max Chilton behind the wheel.[5][6]


Specifications


McMurtry has not published mass and power figures, but are confident that the car will weigh below 1000 kg and have a mass to power ratio of at least 746 kW per 1000 kg (1 horsepower per kilogram). The manufacturer claims that this will be sufficient for the car to accelerate from zero to 300 km/h (190 mph) in 9 seconds, as well as reach an estimated top speed above 320 km/h (200 mph). Estimated driving time on a race track at a GT3 pace is about 30–60 minutes.

The car has rear-wheel drive using two electric motors placed inside a specially designed "e-axle",[2] and uses carbon brakes. The monocoque has room for a driver between 150 and 200 cm (4.9 and 6.6 ft) tall. The battery is integrated into a separate safety cell inside the monocoque.


Active downforce


A special design aspect of the car its active downforce system without the use of a front or rear wing (and the associated extra drag which would have resulted), by means of twin fans which provide an extra 2,000 kg (4,400 lb) of downforce from a standstill. When the fans are at full speed, they emit about 120 dB of noise, comparable to that of a jet engine at full speed.[7][8]

The use of fans powered by separate motors to provide downforce was first conceived of by Jim Hall for the Chaparral 2J, a Can-Am car he designed, constructed and raced in 1970. It was banned at the end of the 1970 Can-Am series. A downforce fan system was also used in the Brabham BT46B Formula One car, which was designed by Gordon Murray. The BT46B raced at the beginning of the 1978 season to great effect before a rule change was made under pressure from other race teams, resulting in a ban on movable aerodynamic surfaces.[9][10]


Tyres


The tyre width is 210 mm on the front and 240 mm on the rear, both on 19 inch (483 mm) rims. This is modest for a supercar and is comparable with regular road cars which tend to have tyre widths between 195 mm and 205 mm.[11]


See also



Comparable electric cars



Other fan cars



References


  1. Speirling – McMurtry Automotive
  2. Vasilash, Gary (23 July 2021). "McMurtry Automotive reveals composites-intensive, fully electric Spéirling demonstrator vehicle". www.compositesworld.com. Retrieved 2022-06-27.
  3. Edgren, John (2021-07-19). "Er dette verdens raskeste elbil? 0–300 på ni sekunder". Tu.no. Retrieved 2022-06-27.
  4. Kew, Ollie (2022-06-27). "What is the McMurtry Spéirling?". Top Gear. Retrieved 2022-09-02.
  5. "39.08! McMurtry fan car breaks Goodwood Hill RECORD! | Festival of Speed 2022". YouTube.
  6. Potts, Greg (2022-06-27). "The McMurtry Speirling has broken the Goodwood hillclimb record". Top Gear. Retrieved 2022-09-02.
  7. "Speirling". McMurtry Automotive. Retrieved 2022-06-27.
  8. Oliva, Jacob (19 June 2022). "Adorably Short Electric Car Aims For 0 To 60 MPH In Under 1.5 Seconds". Motor1.com. Retrieved 2022-06-27.
  9. "McMurtry target Goodwood FoS victory with fan car competing in motorsport for the first time since 1978". McMurtry Automotive. 16 June 2022. Retrieved 2022-06-27.
  10. Edelstein, Stephen (9 July 2021). "British startup McMurtry unveils electric track car with downforce-generating fan". Motor Authority. Retrieved 2022-06-27.
  11. Valmot, Odd Richard (2013-10-06). "Alt du bør vite om dekk". Tu.no. Retrieved 2022-06-27.




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