CHAPTER 17 TRIALS Appendix 6- Technical Regulations – Historic Sporting Trial Car Formula( HST)
Note:( 1) * indicates that additional information must be provided in the Official Documents
1. General
1.1. Vehicles must be prepared in the spirit of the period. The term“ period” refers to the Historic Class for cars manufactured between 1 / 1 / 1931-31 / 12 / 70 and for cars in the Post Historic Class those manufactured between 1 / 1 / 1971 – 31 / 12 / 1978.
1.2. The Organisers of a Historic Sporting Trials reserve the right to disqualify any car that has a specification, component or modification( other than permitted specification modifications) that would not have been used in period.
1.3. In all cases the onus of proving a specification, component or modification as being in period rests with the Competitor who must submit the required documentary evidence.
2. Eligibility
2.1. The Historic Sporting Trials Car Formula involves four-wheel Vehicles complying with all Ch. 7 Technical Regulations except:
a. Ch. 7 App. 2 Arts. 6.5 – 6.9 and 22.4 – 22.9 b. Period Vehicle Waivers( E to G)
2.2. In the following Regulations:
a. The term“ Ford Sidevalve” refers to components from the following models: E04A, E494A, E4930A / B, E93A, E493A, E83W, 100E and 103E. b.
The term“ period” refers to the Historic Class for cars manufactured between 1 / 1 / 1931-31 / 12 / 70 and for cars in the Post Historic Class those manufactured between 1 / 1 / 1971 – 31 / 12 / 1978.
3. Classes
3.1. Vehicles will be divided into two classes, Historic( 1 / 1 / 1931 – 31 / 12 / 1970) and Post-Historic( 1 / 1 / 1971 – 31 / 12 / 1978) according to their technical construction in the following regulations.
4. Chassis
4.1. Must be of period design, constructed of steel tube and complying with the wheelbase and track dimensions shown in App. 7 Chart 1.
4.2. Vehicle engines must be located with the centre of the foremost original manufacturer’ s sparking plug orifice not more than one-fifth of the wheelbase behind the centre line of the front wheel hubs where the only operative water radiator is mounted in front of the engine or one-eighth if no radiator is fitted in front of the engine( tolerance 1cm).
5. Body 5.1. The Chassis must be covered by an open body of period design constructed from Aluminum, Steel or Fibreglass.
5.2. The bodywork must be of adequate strength and proper construction to provide a compartment for Driver and Passenger. It must meet the following criteria:
a. The front and rear overhangs must be as specified in App. 7 Chart 1.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 17 Appendix 6- Technical Regulations- HST Formula 630