Thanks for the Michelin/BFG feedback re not using tubes. I have a few trips to BNI and El Mirage under my belt and have preached the skinny tyre benefits here. Unfortunately not all racers in Australia have such first hand experience and instead rely literally on what they read in the rule book which states that "Tubes are required, except for racing tires expressly designed for use without tubes".
This is in the SCTA rule book, as well as copied into the DLRA version, and perhaps taken out of context but has lead to passenger car tubeless tyres being fitted with inner tubes contary to the tyre manufacturers advice.
I teach auto and the only technical reference I could find, re fitting an inner tube, was as a temporary 'get you home at reduced speed' fix. Occassionally we get a tubed wheel/tyre in class for punture repair and often it had failed because the tube had rubbed through against the ribbed inner casing of the radial tubeless tyre leaving little balls of rubber inside the tyre, and a hole in the tube.
Thanks also for the kind words re the roadster. The www pix are of it as built and raced previously by Rod Mappin. I am in the process of purging it of the Ford front axle
and installing a 1939 Willys beam axle with parallel springs. Being based on a narrowed and shortened 1928 Whippet tourer body and chassis with Willys flathead 4 engine it is now called the 'Whipster'.
Sure would like to see enough of these traditional style 'Lakes Modifieds' turn up at the lakes to form a new 'LM' class.