co-axial

Updated: May 31, 2025

So much for the early designs. With regard to engines of this type specially constructed for use with aircraft, three designs call for special mention. Messrs A. Gobe and H. Diard, Parisian engineers, produced an eight-cylindered two-stroke cycle engine of rotary design, the cylinders being co-axial.

W. Lockwood (William Lockwood) Marsh - A History of Aeronautics