While at BMST this season a builder brought his twin-engine streamliner to display. It had two bone stock Hayabusa engines connected via a chain drive. The two throttles, clutches, and gear shift mechanisms were also connected into the cockpit and controlled with the typical hand controls. I questioned what he did to synchronize the two engines so they were not fighting each other. He said nothing needs to be done. Is that right? I know that two engines have minutely different engine speed and power output just because of the small differences in the way they act. But intuitively it seems to me like the engine that runs faster at the same throttle setting will be driving the other engine, and thus the power output is not twice the output of one.
What needs to be done to synchronize the engines so they are working together instead of against each other? Anything? Any special drivetrain to connect them like a differential?
Thanks
Don