Brabham BT21

Last updated
Brabham BT21
Brabham BT21B
Brabham BT21C
1969 F3 Guards Trophy Brands Hatch James Hunt Brabham BT21.jpg
James Hunt in a Brabham BT21 at Brands Hatch in 1969
Category Formula 3
Formula Libre
Formula B
Production1966
110 cars built
Predecessor Brabham BT18
SuccessorBrabham BT28
Technical specifications
Chassis Tubular space frame
Engine Cosworth MAE Straight-four engine
Transmission Hewland Mk. 4 5-speed manual
Weight410 kg (900 lb)
Competition history
Notable drivers Flag of the United Kingdom.svg James Hunt
Brabham BT21 Brabham BT21.jpg
Brabham BT21

The Brabham BT21 was an open-wheel formula racing car, designed, developed, and built by Brabham in large numbers in 1966 and delivered to private individuals; 110 vehicles were manufactured. [1]

Most were manufactured as Formula 3 cars, with some built for US Formula B and given the designation 21B. The wagons for the Formule Libre ran under the identifier 21C. [2] [3]

The first BT21s came to international racetracks in 1966. The chassis was flatter than the BT18, the suspension was revised and the body was completely rebuilt. In 1966 and 1967, a 997 cc (60.8 cu in) naturally aspirated Cosworth MAE four-cylinder engine with 125 hp (93 kW) and in 1968 a Holbay unit were used as engines. This drove the rear wheels through a Hewland Mk.4 five-speed manual transmission. The chassis was constructed out of a tubular space frame, with a lightweight fibreglass body. This meant the car was very light and nimble, weighing in at only 900 lb (410 kg). [4] [5]

Private drivers like Peter Westbury with his Felday Engineering Ltd. had much success with the BT21 in 1967. In 1968 the BT21 became a serious opponent with the new Tecno and the victories in Formula 3 became fewer.

The BT21B, therefore, underwent some changes. The car got wider wheels and a sturdier tubular space frame derived from the BT23, a Formula 2 car. This eliminated the shortcomings. In 1969 the BT21 was slowly being replaced by the BT28.

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References

  1. Brown, Allen. "Brabham « OldRacingCars.com". OldRacingCars.com.
  2. Brown, Allen (25 June 2023). "Brabham BT21C car-by-car histories". OldRacingCars.com.
  3. Brown, Allen (7 March 2022). "Brabham BT21A car-by-car histories". OldRacingCars.com.
  4. "Al Murray's Lotus Twin-Cam Powered Brabham BT21 Racecar, Number 67". www.britishracecar.com.
  5. "1967 Brabham BT21 technical and mechanical specifications" . Retrieved 15 June 2022.