It is believed Tangye type "O" Oil engines followed on from the Type "P" engines.
As with most Tangye dating records when the first "O" engine was built is unknown, but from catalogues available the Type "O" engines were first listed in 1906.
As can be seen from the tables below, type "O" oil engines were given a two letter Reference designation, the first starting with the letter A then B etc, indicated engine HP then the second letter always O indicated type "O" Oil. Heavier flywheel Electric Light engines were given a third letter "E".
At or about the same time new model Type "B" Benzoline and Type "A" Alcohol engines were released.
The serial number of Type "O" engines originally used a suffix B after the number, at this stage the exact meaning of the B is unknown but thought to involve design modifications to previous engines.
Type "O" engines carried a Tangye Patents plate, the letter S being deleted from those used on previous plates,they can be seen on Tangye Plates Page
This information was taken from "Oil Engines, Benzoline Engines, Alcohol Engines" catalogue section 111. No 73 dated 1906.
Type "O" engines were still being listed in a catalogue dated February 1907
As additional data is obtained the details on this page will be updated.
* Tangye "O" type Oil engines are suitable for working with ordinary petroleum (Kerosene) or Paraffin lamp oil.
* The HP figures stated in the tables below are the powers which the engines are capable of developing continuously during a ordinary full days work of 10 hrs.
* A flywheel and pulley is supplied with engines AO to EO, sizes FO and larger have two flywheels and pulley.
* Electric lighting engines are supplied with a heavy flywheel with extended shaft and outer bearing to all engines except AOE which has two flywheels.