It was a liquid-cooled piston engine with four inline cylinders, mounted vertically.

(Earlier Wright engines were mounted horizontally.)

It generated about 30–40 horsepower (22–30 kW) from a displacement of 240 cubic inches (3.9 liters) and weighed about 160–180 pounds (73–82 kg).

[3][4] Around a hundred Vertical 4 engines were built, according to a Wright test foreman.

This engine was also built under license by Bariquand et Marre in France and by Neue Automobil-Gesellschaft in Germany.

5: The Wright Brothers' Engines and Their Design (PDF).