Trebert Engine Works made two types of engines:

A classic water-cooled V-8 with 100 HP at 1,200 rpm.

“Trebert V-8”

As we can see, it has a single magneto, therefore, single-ignition.

And the other engine was not as common. Both were built in 1912. It was a “barrel” or “revolver” type engine, with 6 cylinders giving 60 HP.

The propeller speed was halved.

“Trebert Barrel Engine”

Another engine that has appeared is the Trebert X type. It is a 16-cylinder engine built around 1922.

“Trebert X”

 

The X was formed by four rows of four cylinders each, at 90° angles to each other.

From Appendix 6: Wiki-Commons contains a copy of the patent for this engine, although not the description of each element, but some of them are easy to guess: Carburetor, Magneto, Cylinders.

“Fig. No. 1 of Henry Trebert's Patent”

- We now have a 16-cylinder radial and rotary engine built by the HLF Trebert Engine Works of Rochester, New York.

- It was specifically built for use in aviation and had a compact design.

- The power was rated at 150 HP, with a total weight of 325 lb.

- Without a conventional crankshaft and connecting rods, it used a rigid yoke with a sliding bearing in the center for each of two opposing pistons.

- The carburetor at the rear feeds the engine through the center of the central crankcase.

“Appearance of the Trebert 16-Cylinder Engine”

From Appendix 10: Based on the same idea as the Macomber and many others, the Trebert was manufactured by H.L.F. Trebert Engine Works of Rochester, NY.

“Trebert on a Base”

While the Macomber's cylinder power is applied to an inclined plate, the Trebert, both being "revolver" engines, combines the advantages of two- and four-stroke engines, without valves.

“Trebert ad”

It is an engine without valves and without vibrations. Neither had it gyroscopic effects, even though it is considered rotary.