Penske PC-9

The Penske PC-9 and Penske PC-9B are USAC and CART open-wheel race car chassis, designed by British designer Geoff Ferris at Penske Racing, which was constructed for competition in the 1980 and 1981 IndyCar seasons, as well as the 1980 season and 1981–82 USAC Champ Car seasons. It also notably successfully won the 1981 Indianapolis 500, being driven by Bobby Unser.^{[2][3][4][5][6][7][8]}

Penske PC-9
Penske PC-9B

Category	CART IndyCar
Constructor	Penske
Designer(s)	Geoff Ferris
Predecessor	Penske PC-7
Successor	Penske PC-10
Technical specifications
Chassis	Aluminum Monocoque
Suspension	Inboard springs and Fox shocks front and rear, operated by top rocker arm with front and lower rear A arms of streamline tubing
Engine	Cosworth DFX 2,650 cc (161.7 cu in) V8 80° Mid-engined, longitudinally mounted
Transmission	Hewland L.G.500[1] 4 speed manual
Weight	1,550 lb (703.1 kg)
Fuel	Methanol, supplied by Mobil
Tyres	Goodyear Eagle Speedway Specials - Rear 27.0x14.5-15 - Front 25.5x10.0-15
Competition history
Notable entrants	Penske Racing
Notable drivers	Rick Mears Bobby Unser Mario Andretti Tom Gloy Bill Alsup

1981 Indy 500-winning Penske PC-9B chassis of Bobby Unser

Penske PC-9B being demonstrated at the 2011 Goodwood Festival of Speed