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307The ex-Mac Daghorn, Brands Hatch Guards Trophy race1966 Felday 5 Group 7 Sports-Racing PrototypeChassis no. 50011,2 and 3Peter Westbury testing the Felday 5, BrandsHatch, 1966© Ted WalkerPeter Westbury’s Felday Developments company at Holmbury-StMary near Dorking in the Surrey hills built this technology-provingspaceframe-chassised sports-racing car for Group 7 ‘big-banger’racing in the 1966 season.While the company’s smaller sister car, the backbone-chassisedFelday 4 with 2-litre BRM V8 engine and ground-breaking newFerguson Formula 4-wheel drive transmission, had won at clubracing level driven by both Peter Westbury and his Channel islanderteam-mate Mac Daghorn, it would achieve undying fame bybecoming the car loaned to double-Formula 1 World Championdriver Jim Clark for the major Guards Trophy race which headlinedthe annual August Bank Holiday Monday meeting at Brands Hatch.While the brilliant Scotsman would explore the Felday-BRM 4’spotential within the Guards Trophy’s 2-litre category, the spaceframe‘big-sister’ Felday-Ford 5 was prepared simultaneously to make itsracing debut that day, driven by Mac Daghorn.The new car had first turned a wheel during an unofficial test session atthe Kentish circuit on the preceding Thursday. Its spaceframe chassisstructure had been designed by engineer Mike Hillman and weldedupfrom large-diameter round and rectangular-section steel tubing.Externally the Felday 5 looked very similar to the Felday 4 with its noseand tail body sections and drop-down doors each side in mouldedglass-fibre. Aluminium sill sections on each side accommodated25-gallon fuel tanks. Felday-designed cast-magnesium wheels werefitted, with 15-inch x 10-inch wide same-size rims front and rear. Inthe light of test experience that day 12.10 x 15 Firestone rear tyreswere adopted, with 9.20 x 15s at the front. A simple carburettor intakescoop was also added to the car’s rear deck.In its original Guards Trophy form the car was powered by a Holman& Moody-prepared 7-litre Ford V8 engine, converted by Felday todry-sump lubrication, and rigidly mounted to help stiffen the car’srear bay. Mike Hillman’s all-independent suspension system was fullyadjustable for camber, castor and toe-in.78 | Goodwood festival of speed