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. 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. 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.
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| - Brabham BT21 (de)
- Brabham BT21 (en)
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| - Der Brabham BT21 war ein Formel-Rennwagen, den Brabham 1966 in großer Stückzahl baute und an Privatiers auslieferte; 110 Fahrzeuge wurden hergestellt. Die meisten waren Formel-3-Wagen, einige wurden für die US-amerikanische Formel B gebaut und erhielten die Bezeichnung 21B. Die Wagen für die Formule Libre liefen unter der Kennung 21C. Privatfahrer wie Peter Westbury mit seiner Felday Engineering Ltd. hatten 1967 viel Erfolg mit dem BT21. 1968 erwuchs dem BT21 mit dem neuen Tecno ein ernstzunehmender Gegner und die Siege in der Formel 3 wurden weniger. (de)
- 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. 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. 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. (en)
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| - Der Brabham BT21 war ein Formel-Rennwagen, den Brabham 1966 in großer Stückzahl baute und an Privatiers auslieferte; 110 Fahrzeuge wurden hergestellt. Die meisten waren Formel-3-Wagen, einige wurden für die US-amerikanische Formel B gebaut und erhielten die Bezeichnung 21B. Die Wagen für die Formule Libre liefen unter der Kennung 21C. Die ersten BT21 kamen 1966 an die internationalen Rennstrecken. Das Fahrgestell war flacher als beim BT18, die Aufhängung wurde überarbeitet und die Karosserie völlig neu gebaut. Als Motoren kamen 1966 und 1967 ein Cosworth-MAE-Motor mit 125 PS und 1968 ein Holbay-Aggregat zum Einsatz. Privatfahrer wie Peter Westbury mit seiner Felday Engineering Ltd. hatten 1967 viel Erfolg mit dem BT21. 1968 erwuchs dem BT21 mit dem neuen Tecno ein ernstzunehmender Gegner und die Siege in der Formel 3 wurden weniger. Der BT21B erfuhr daher einige Änderungen. Der Wagen bekam breitere Räder und einen stabileren Gitterrohrrahmen, der vom BT23, einem Formel-2-Wagen, stammte. Damit wurden die Mängel beseitigt. 1969 wurde der BT21 langsam vom abgelöst. (de)
- 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. 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. 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). 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. (en)
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