I remember reading an interview with Vic Elford somewhere, comparing the '70 Chaparral Camaro to the '71 ARA Javelin...... The Camaro being MUCH easier to drive with power steering and manual brakes; opposite of how the Javelin was set up. Remember, Roy Woods '71 cars were actually re-skinned Penske '70 models. Roy and Mark were fairly tight, and not a lot was changed engineering wise. Mark ran the Girling 'boosted' front brakes. I have a picture underhood of the Chaparral, and it does have a brake booster.... so maybe the Hall cars evolved through the season? I can say from first hand experience, with a good amount of caster, manual steering, and a slightly too small of steering wheel just due to rollcage and such, 30 minute vintage races in the Texas heat are tough- one hour enduro..... ? almost need medical help!
Nomex underwear, 2 layer suit, hood, enclosed helmet= oven... Ken