If a car is to be machined using a smaller drill bit than the standard 6mm diameter bit, can the car have internal concave radii less than 3.5mm (as specified in the rules)?
YES. This is allowable for CONCAVE edges only. CONVEX edges are regulated as per Regulation 2f (Rules and Regulations 2009, page 13), specifically stating that all CONVEX edges that have adjoining surfaces less than 90 degrees, MUST have a radius strictly greater than 1.5mm (there is strictly no tolerance allowance below 1.5mm). NB: This regulation is classed as ‘critical’ (note that it is in RED). This means if it is not adhered to, the car may: -Be classed as unsafe to race, and disqualified (at the discretion of specification judges); and/or -Be penalised 2 marks (rather than 1), against the car’s specifications.
