If the two side engines are connected by chains to the center engine's crankshaft, how can you be sure that all three engines will operate at exactly the same rpm?
What if one engine is turning faster than the others?
The chains mechanically connect all three engines to one another, so if all the sprockets have the same number of teeth, they will all turn the same RPM, even if one if the engines wasn’t running.
Certainly not my cup of tea, but you got to love the ingenuity.
