A magnificent video on yet another brilliant Napier product, the Deltic:
As you heard, before Napier, Junkers too found out there were problems with the correct phasing of the three cilinder banks. Where Junkers abandoned the triangular design and developed a 'square' variant with four banks, which apparently gave no problems, Napier found the solution. Or rather, a senior draftsman at Napier found it: simply making one of the three crankshafts run in the opposite direction to the other two!
MFBB.
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