Emerson Engine Co made at least three models of water-cooled, inline, aviation engines.

“Emerson 6-cylinder”

-The "Aerial" from 1910 with six cylinders gave 120-150 hp according to the rotation speed.

-In 1911, the 60 hp four-cylinder engine appears as well as another six-cylinder that gave 100 hp.

From Appendix 10: The Emerson Engine Co. Inc., in Alexandria, Virginia, was making engines for aviation as early as 1910.

"The 60 HP, installed on an airplane"

-The 6-cylinder engines that gave 100, 120 or 150 hp were similar to each other, in architecture.

"The Emerson six-cylinder on both sides"

"A six-cylinder installed with radiator and tank"

-In articles of the time appears a "skeleton" of an Emerson 8-cylinder in line engine that draws attention but we can not confirm that it went into production.

"Maybe it was the union of two 4-cylinder engines"

-Their propaganda mentioned that they used German steel of greatest resistance, including from Krupp.

-In an ad of the time is also said "To have enough power to fly and not like a lawn-mower."