Four Inch Course

Four-Inch Course
Location Douglas, Isle of Man
Time zone GMT
Major events RAC Tourist Trophy
Length 37.5 mi (60.39 km)
Turns 220+
Lap record 1 hour 32 mins, 32.2 sec (57.70 mph) (Major Henry Seagrave, Sunbeam, 1922)

The Four-Inch Course was a road-racing circuit first used for the 1908 Tourist Trophy Race for cars,[1] held on public roads closed for racing by an Act of Tynwald (the parliament of the Isle of Man). The name of the course derives from the regulations for the 1908 Tourist Trophy adopted by the Royal Automobile Club, which limited the competitors' engines to a cylinder-diameter of four inches. The Four-Inch Course was adopted by the Auto-Cycle Club for the 1911 Isle of Man TT Races. The Four-Inch Course was subsequently known as the Snaefell Mountain Course or Mountain Course when used for motor-cycle racing.

Four-Inch Course

The new course length was 37.5 miles, based on the 'Short' Highlands Course with the omission of the Sandygate Loop and the Peel Loop. The start-line was moved from the road junction of the A2 Quarterbridge Road/Alexander Drive to Hillberry Corner on the A18 Mountain Road.

The Four-Inch Course was based on a number of public roads closed for the duration of racing, including:

The Four-Inch Course was adopted by the Auto-Cycle Club for the 1911 Isle of Man TT Races and the start-line was moved to a level section of the Quarterbridge Road between Selborne Drive and the 1st Milestone/Alexander Drive, becoming known as the Snaefell Mountain Course when used for motorcycle racing.[2]

From the 1920 Isle of Man TT races, changes were made to the Snaefell Mountain Course and competitors turned left at Cronk-ny-Mona following the primary A18 Bemahague Road to Governor's Bridge, then to a new start/finish line on Glencrutchery Road which lengthened the course from the pre-World War I length of 37.50 miles (60.35 km) to 37.75 miles (60.75 km).

More changes to the course followed for the 1923 Isle of Man TT races with the adoption of two small sections of private road between Parliament Square and May Hill in Ramsey. The Snaefell Mountain Course had previously negotiated the A2 Albert Road and Tower Road in Ramsey which differed from the original Four-Inch circuit which had incorporated these sections of private road and the new Mountain Course length increased to 37.739 miles (60.74 km). The official course distance for the Snaefell Mountain Course was amended for the 1938 Isle of Man TTraces to 37.733 miles (60.73 km) which is the current Snaefell Mountain Course length.[3]

See also

Sources

  1. ↑ TT Pioneers – Early Car Racing in the Isle of Man pp.103–104 Robert Kelly, Mercury Asset Management (1996) (1st Edition) The Manx Experience, The Alden Press ISBN No 1 873120 61 3
  2. ↑ The Tourist Trophy in Old Photographs Collected by Bill Snelling. Bill Snelling p.14 Sutton Publishing ISBN 1-84015-059-9
  3. ↑ Official TT Guide 1992 p.45 edited by Norrie White Isle of Man Department of Tourism (1992) Mannin Media Ltd

External links

Coordinates: 54°10′18″N 4°29′31″W / 54.17167°N 4.49194°W / 54.17167; -4.49194

This article is issued from Wikipedia - version of the 8/15/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.