Arrol-Johnston 15.9 HP
Car : Arrol-Johnston 15.9 HP
Year : 1911
Engine : 4 cylinders in line
Bore and stroke :80?120 mm
Cylinder capacity : 2411 cc
Gears : 4 forward
Brake horse power : 34
Maximum speed : 45 mph
Wheelbase : 9 ft 6 ins (2.89 m)
Suspension : front: semi- elliptic leaf- springs; back: elliptic leaf- springs
This was the prestige car of this Scottish firm founded in 1897 by William Arrol and George Johnston. At first called Mo-Car Syndicate Ltd, from 1905 it changed its name to New Arrol-Johnston Car Company Ltd. Its early cars had much in common with coaches, but gradually the became more modern, acquiring a certain name for themselves through race results.

In a twin-cylinder model J. S. Napier won the first Tourist Trophy (1905) with and average speed of over 30 mph. The 15-9 HP was the brainchild of T. C. Pullinger, director of Arrol in 1909. The engine had side valves, with L-head and shaft transmission. Detachable wheels and dashboard radiator made it an original car. The front brakes were standard, but were abandoned due to malfunctioning. In 1927 it merged with the Aster Engineering Company Ltd and for four years cars were made under the name Arrol-Aster. The decision to reduce production , in 1929, did not have the results that had been hoped for and the company closed down in 1930.