The Earth Isn't Flat — The Reality Regarding Flat-Plane Crankshafts
Crossplane - Wikipedia
A crossplane V8 typically operates smoother than a flatplane V8 and an I4. How would a flatplane V8 feel compared to the I4 across the RPM range? - Quora
CROSS PLANE vs FLAT PLANE crank shaft in BIKES | ADVANTAGES and DISADVANTAGES - YouTube