Mr. H. Roberts, president of this company from Burbank, California, designed a rotary radial engine with a “Scotch yoke” type linkage system, that is, each two opposed pistons are rigidly joined by a connecting rod with a central slotted hole for the crankshaft.

“H. Roberts and his rotary engine”

-Initially it gave 80 HP and it could not be developed beyond 150 HP due to gyroscopic problems.