The British Ariel Square Four (also referred as Squariel) was a design of Edward Turner. Being unemployed at the time, Turner took his drawings of an innovative engine design from one bike manufacturer to the other. It was persistently ignored. Of the giants, BSA rejected the idea, but it was approved by Ariel bikes. This was before the birth of the Ariel Square Four.
Turner’s engine was unconventional for its time; it was essentially two OHC twins lying parallel to each other; a flywheel (geared) joined them together. Debuting at the Motorcycle Show of Olympia in 1930, the first model was featured in a chain-driven overhead cam-shaft form. It had an engine having capacity of 500 cc. The old generation of this model used to have an ingenious 4-speed gear box.
In the year 1932, the engine capacity was lifted to 601 cc by using [...]
 
Ariel Bikes and its Famous CreationsPosted at November 1st, 2010 in ArielThe British Ariel Square Four (also referred as Squariel) was a design of Edward Turner. Being unemployed at the time, Turner took his drawings of an innovative engine design from one bike manufacturer to the other. It was persistently ignored. Of the giants, BSA rejected the idea, but it was approved by Ariel bikes. This was before the birth of the Ariel Square Four. Turner’s engine was unconventional for its time; it was essentially two OHC twins lying parallel to each other; a flywheel (geared) joined them together. Debuting at the Motorcycle Show of Olympia in 1930, the first model was featured in a chain-driven overhead cam-shaft form. It had an engine having capacity of 500 cc. The old generation of this model used to have an ingenious 4-speed gear box. In the year 1932, the engine capacity was lifted to 601 cc by using [...]