12 Hours of Brno

In October 1950 a 12-hour race combined for SportsCars and Saloon Cars was held at the Brno circuit.

The race organizers created an interesting and unique mathematical formula (the so-called power output indicator) to equalize the potential of all cars. The formula was based on a predetermined average speed that differed for cars with various engine capacity, and the corresponding distance expected to be covered by each car over the 12-hour period. The actual distance traveled by a car was then divided by this expected distance to arrive at a quotient, and the results were based on the values of this quotient. Consequently, even cars with the smallest engine size could win the race if they reached sufficient distance, while anybody failing to complete the expected distance was not classified at all. The calculation was further complicated by a provision that any lap completed below the projected average speed was not counted toward the total traveled distance.

Consequently, the overall winner was Treybal with saloon Bristol, who reached a quotient of 1.268 while travelling 1121.158 km (4th longest distance). The pair Pavelka/Zd. Sojka with Tatraplán Sport covered the longest distance of 1192.933 km but their quotient of 1.098 was good for only 14th place in final classification. The race was seen as a great success, yet initial plans to hold a 24-hour race in the following year and thus establish an endurance racing tradition in Brno were eventually abandoned.

24H Series

In 2015 the 24H Series returned to the Brno circuit for a 12-hour race, called the 12H Epilog Brno. It was the last race of the season.

References

^[1]

^ Svět Motorů magazine, Nos. 91, 92

[1] Svět Motorů magazine, Nos. 91, 92

[1]

v t e Automobile endurance races
24 hours	24 Hours of Le Mans 24 Hours of Daytona Nürburgring 24 Hours Spa 24 Hours Dubai 24 Hour Fuji 24 Hours 24 Hours of Zolder 24 Hours of Portimão 24 Hours of Barcelona - Trofeo Fermí Vélez [es] 2CV 24 Hour Race Longest Day of Nelson 24H Silverstone – European Touring Car Edition 24 Hours of Chamonix [fr] Willhire 24 Hour Bathurst 24 Hour Tokachi 24 Hours
12 hours	12 Hours of Kuwait 12 Hours of Sebring Bathurst 12 Hour Gulf 12 Hours Sepang 12 Hours Coppa Florio 12 Hours of Sicily 12 Hours at the Point 12 Hours of Brno 12 Hours of Reims Rothmans 12 hours
10 hours	Petit Le Mans Qatar 1812 km
9 hours	Kyalami 9 Hours
8 hours	8 Hours of Bahrain Indianapolis 8 Hour California 8 Hours 1000 Miles of Sebring
6 hours	6 Hours of Abu Dhabi 6 Hours of Bogotá 6 Hours of Fuji 6 Hours of Imola 6 Hours of Jeddah 6 Hours of Rome 6 Hours of São Paulo 6 Hours of Spa-Francorchamps 6 Hours of Watkins Glen Bathurst 6 Hour 6 Hours of Austin Monterey 6 Hours 6 Hours of Indianapolis (IMSA) 6 Hours of Perth 6 Hours of Atlanta 6 Hours of Donington 6 Hours of Mexico 6 Hours of Monza 6 Hours of Nürburgring 6 Hours of Portimão 6 Hours of Zhuhai Riverside 6 Hours Mid-Ohio 6 Hours Mosport 6 Hours
4 Hours	4 Hours of Abu Dhabi 4 Hours of Barcelona 4 Hours of Dubai 4 Hours of Imola 4 Hours of Le Castellet 4 Hours of Mugello 4 Hours of Portimão 4 Hours of Sepang 4 Hours of Spa-Francorchamps 4 Hours of Aragón 4 Hours of Estoril 4 Hours of Red Bull Ring 4 Hours of Shanghai 4 Hours of Silverstone
2 hours	TCR European Endurance
1000 miles	Mil Milhas Brasil Mille Miglia
1000 km	1006 km Palanga 1000 km Paul Ricard Bathurst 1000 Baja 1000 Sepang 1000 km Suzuka 1000 km 1000 km Brands Hatch 1000 km Buenos Aires 1000 km Istanbul 1000 km Jarama 1000 km Le Mans (Bugatti) 1000 km Mosport 1000 km Okayama 1000 km Paris Race of a Thousand Years
Other	25 Hours of Spa 25 Hours of Thunderhill Carrera Panamericana Charge of the Headlight Brigade Targa Florio TCR Spa 500 Laps or 23 Hours The 2904
Defunct races are indicated in italics

24H Series

See also

References