The manufacturer of the famous Indian motorcycles was Hendee Mfg. Co. in Springfield, Massachusetts, also entered into the manufacture of aeronautical engines.

-They made two types of engines, one in V and one rotary radial.

“Indian V8”

-The V8 gave 65 hp. The combustion chamber was separate and contained the valves, one above and the other below.

“Indian Rotary”

-The rotary was a 7-cylinder giving 50 hp of power at 1,100 rpm. An engine like this is exposed at the NASM.

-We achieved a photograph for the Indian radial of which there is shown an outline in the main text.

“Indian rotary engine, 50 hp”

-Now we know two rotary engines with the name of Indian, actually built by the Hendee Manufacturing Company of Springfield, like the V8 of the main text and also of all the motorcycles of that brand.

-In 1911 a Bleriot with an Indian engine made the first postal service in the USA.

-Photo of the engine at the NASM.

-Below we see an Indian 2-cylinder motorcycle V-engine in a sports aircraft.

“Indian V-engine” (PiP)

-Another motorcycle V-engine assembly we see installed by adaptation on the Mix "Flying Arrow" biplane.

“Indian en Flying-Arrow” (PiP)

From Appendix 6: New applications of this American motorcycle engine are being found.

-One of them, the installation of an Indian Chief on the Garbrick, a small plane as we see in the below photograph of Aerofiles. Year 1941

"Indian Motor in the Garbrick mini-plane" (PiP)

-Another engine would be the Indian J-2 with 18.5 hp on the F. Timer of 1924, although it did not prosper due to excessive vibrations of the engine.

-The Chiefs gave 17/18 hp and they were also mounted on the light EPPS of 1925 or the Folkerts of 1917.

-But the application that draws our attention is the double mounting of Chiefs on Gallaudet Chummy with two propellers on the leading edge of the main wings and with a complicated transmission by chains and bars.

“Photo of the Chummy in Aerofiles” (PiP)

-Trying to enlarge the image of the two twin-mounted engines in the front, we see that they are two-cylinder V-engines.

“Chummy twin-engine assembly” (PiP)

From Appendix A3/6: We obtained a better view of the V8 engine that we have also shown in the main text.

“Indian V8”

-This is a view from the other side of the one that was initially published.

-Indian made these engines in an experimental plan, let's not forget that their specialty was the construction of motorcycles.

From Appendix 9: We located a four-cylinder inline motorcycle engine modified for aviation.

"4-cylinder engine adapted for aviation"

-A coupling of two V-engines, made by Gallaudet, with a complicated transmission for two propellers.

"The airplane and an Indian engine of the time"