BRM P261
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| Category | Formula One/Tasman | ||||||||
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| Constructor | British Racing Motors | ||||||||
| Designer(s) | Tony Rudd | ||||||||
| Predecessor | BRM P61 | ||||||||
| Successor | BRM P67 / BRM P83 | ||||||||
| Technical specifications | |||||||||
| Chassis | Duralumin monocoque | ||||||||
| Suspension (front) | Double wishbone, with inboard spring/damper units | ||||||||
| Suspension (rear) | Double wishbone, with outboard coilover spring/damper units | ||||||||
| Axle track | F: 54 in (1,372 mm) (adj.) R: 53 in (1,346 mm) (adj.) |
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| Wheelbase | 91 in (2,311 mm) (adjustable) | ||||||||
| Engine | BRM P56 1,498 cc (91.4 cu in) V8 Naturally aspirated mid-mounted | ||||||||
| Transmission | BRM P72 6-speed manual | ||||||||
| Weight | 1,028 lb (466.3 kg) | ||||||||
| Fuel | Shell | ||||||||
| Tyres | Dunlop | ||||||||
| Competition history | |||||||||
| Notable entrants |
Owen Racing Organisation Reg Parnell Racing |
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| Notable drivers |
 Graham Hill Richie Ginther Jackie Stewart Richard Attwood
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| Debut | 1964 Monaco Grand Prix | ||||||||
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| Constructors' Championships | 0 (2nd: 1964; 1965) | ||||||||
| Drivers' Championships | 0 (2nd: 1964; 1965 - Graham Hill) | ||||||||
| n.b. Unless otherwise stated, all data refer to Formula One World Championship Grands Prix only. |
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The BRM P261, also known as the BRM P61 Mark II, is a Formula One motor racing car, designed and built by the British Racing Motors team in Bourne, Lincolnshire, England. The BRM P261 was introduced for the 1964 Formula One season, and its design was an evolution of Tony Rudd's one-off BRM P61 car of 1963. The P261 had a relatively long racing career; variants of the car were still being entered for Formula One World Championship Grands Prix as late as 1968. During the course of their front-line career BRM P261s won six World Championship races, in the hands of works drivers Graham Hill and Jackie Stewart, and finished second in both the Drivers' and Constructors' Championship standings in 1964 and 1965. Stewart, Hill and Richard Attwood also used works P261s to compete in the Tasman Series in 1966. The BRMs dominated, with Stewart winning four, Hill two, and Attwood one of the 1966 Tasman Series' eight races. Stewart also won the title. The works-backed Reg Parnell Racing team returned in 1967 with Stewart and Attwood, where Stewart added another two wins to his tally. In terms of races won and total Championship points scored, the P261 was the most successful car in BRM's history.
Colin Chapman's monocoque Lotus 25 of 1962 had put the writing on the wall for older spaceframe chassis designs, and most other Formula One constructors hurriedly started work on their own monocoque cars. The BRM P261 was British Racing Motors's first fully monocoque chassis. Its prototype, the one-off P61 introduced in 1963, had pioneered many of BRM's monocoque elements, but had used a tubular subframe for its rear engine mounting. As its name suggests, with the P261 (or P61 Mark II) designer Tony Rudd simply built upon the P61's structure, rather than introducing a completely new car. To emphasise this continuity, the P261 chassis numeration continues the P61 sequence, with the first P261 chassis being numbered 2612.
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