2006 Radical SR9
The SR9 is Radical’s first LMP2 car which debuted at Paul Ricard test in March 2006.
The initial concept of the SR9 was a ‘value for money’ LMP2 car that used Radical’s own Powertec RPD 3.0 litre V8, but the company later decided to made proper bespoke racecars that would be individually made for future customers.
This change was motivated by Peter Elleray who came on board and used his experience designing the LeMans-winning Bentley EXP on the SR9. For Radical, he used a completely carbon fibre monocoque that can attach a Judd V8 or an AER Powertec Turbo to the bulkhead, but leaves it unstressed. Power is delivered to the rear wheels through Ricardo’s 750Nm sportscar box.
Radical’s first customer, Rollcentre Racing from the UK helped design and produce the SR9 to replace their aging Dalara SP1 LMP900. Powered by a Judd V8, Rollcentre’s best achievement has been a fifth place at the Le Mans 24-Hour Race. Also present was Radical’s own AER-powered car which placed 15th. Sadly, both teams retired at the 2007 event.
For the 2007 season, Radical made their debut in the American LeMans Series (ALMS) with them Van Der Steur Racing. This team suffered a racing incident during pre-season testing which delayed the debut of the car until the Lime Rock Park.
Story by Supercars.net
|submitted by||Richard Owen|
|engine||AER P07D Inline-4|
|valvetrain||DOHC, 4 Valves per Cyl|
|displacement||1995 cc / 121.7 in³|
|power||395.2 kw / 530 bhp @ 7500 rpm|
|specific output||265.66 bhp per litre|
|bhp/weight||683.87 bhp per tonne|
|torque||620 nm / 457.3 ft lbs|
|body / frame||Cabon Fibre Monocque|
|driven wheels||RWD w/Mechanical Plate LSD|
|wheel type||Forged Magnesium BBS|
|front brakes||Carbon Discs w/Monobloc AP Racing 6-Piston Calipers|
|rear brakes||Carbon Discs w/Monobloc AP Racing 6-Piston Calipers|
|front wheels||F 45.7 x 27.9 cm / 18 x 11 in|
|rear wheels||R 45.7 x 33.0 cm / 18 x 13 in|
|steering||Electrically-driven, power-assisted system|
|f suspension||Double Wishbones w/Pushrod Operated Inboard Adj Shock Absorbers|
|curb weight||775 kg / 1709 lbs|
|transmission||Ricardo 6-Speed Sequential Transaxle|