(see American Gyro). The Gyro Motor Company, was based in Washington, DC. In 1911, engineer Berliner from this company acquired the license to build the 7-cylinder Gnome "Omega" under the name of "Old Gyro".

“Old Gyro”

-Together with Adams Farwell they were the first to build rotaries in the United States.

-In fact, designer Emile Berliner worked for both companies.

-The first Gyro engine was the "Old Gyro", a seven-cylinder rotary that gave 50 hp at 1,500 rpm.

-It had an intake valve on the piston head and a controlled exhaust one in the cylinder head.

“Duplex System”

-Around 1914 the improved models known as "Duplex" came out.

-As explained in American Gyro, they had a double track on the cam plate, one for the exhaust command and another one for a slide valve on the outside of the cylinder about two inches above the piston BDC.

-There was the 5-cylinder "J" model giving 50 hp at 1,250 rpm.

“Gyro K”

-The 7-cylinder "K" model gave 90 hp. Finally the "L" was a 9-cylinder that gave 110 hp at 1,200 rpm.

“Another Gyro K”

-We can see the mixture ducts towards the valves in the lower part of the cylinders.

“Gyro L”

-In 1914, Beatty-Wright planes flew in Hendon, England, with three different models, two of them with "Gyro" engines (called American Gyros), with 50 and 60 hp and the third with a normal four-cylinder Wright engine.

-Below we show a picture of a Gyro ad from 1912, of an engine that weighed 170 pounds and gave 50 hp of power.

“Gyro with support”

-The offered sizes were 3, 5 and 7-cylinders with 22, 35 and 50 hp respectively.

-Between 1912 and 1914, "Duplex" models of this brand are appearing. They obtained 90 hp with nine cylinders. 80 hp with 7 cylinders and 100 hp once more with 9 cylinders.

“Gyro Duplex, 80 hp”

“Gyro Duplex, 90 hp”