Ajax built rotary engines with 3, 6 and 7 cylinders.

With a mechanism similar to Ligez and these engines belong to this group as they are considered bi-rotaries.

"Ajax 7 cylinders"

-By the main text we know that the seven-cylinder engine was bi-rotary similar to the French Ligez mechanism.

-Below we repeat the diagram of the Ligez engine that allows us to see the gear that rotates the engine in one direction and the propeller in the counter direction.

"Ligez diagram"

“3 cylinder Ajax”

-We have located a new three-cylinder Ajax engine and either it is a drawing or it is a poor quality photograph.

-But in any case, it is missing the front hub part of the engine that covers the crankcase, exposing a part of the inner mechanism.

"6 cylinder Ajax (double 3 cylinder engine)"

"Ajax Construcción (80 CV)"

From appendix 9: This is before 1910. because this information is taken from a text of that date.

-However the author knows a 6-cylinder engine that is a result of uniting two 3-cylinder engines that could be from a later date.

“Two diagrams of the Ajax 7 cylinder engine”

-We have located a dial plate that is installed on the front of the Ajax three-cylinder engine, that is also mentioned in the main text. It was used for adjustments and tuning.

"3 cylinder Ajax engine"

"Adjustment dial plate"

From Appendix 10: This company was situated near Zurich and was in operation between 1906 and 1910, dedicated to the automotive industry and they also made aviation engines.

-A new photograph of the 7-cylinder, radial engine has been sent to me by TH where we see details like the builder's brand and the factory's location.

-For the period and the engine's geometric shape, it seems a rotary engine.

“Ajax 7-cylinder rotary”