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Really nice model, I'd like to see an odd numbered amount of pistons though, as stated by ModelStation. (preferably 7 cylinders)
The reason for this odd number of cylinders is the firing order, which skips one cylinder every time.
As such, a 7 cylinder radial has the firing sequence: 1,3,5,2,4,6 and back to 1, where the numbers represent the cylinders.
An 8 cylinder radial would have the sequence: 1,3,5,7 and back to 1, thus skipping the even numbered cylinders.