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28 cylinder radial engine on dyno

the final form of the 7 cylinder radial, with 28 cylinders and 4 rows arranged in a helical pattern offset by 13 degrees between each row. Due to its power no clutch can handle it and thus it is hooked up to a 2 speed gearbox on the dyno. I tried to make it completely even firing and i think i mostly succeeded, but tuning an engine with 28 cylinders is pretty tough. Not exactly supposed to be a completely 100% accurate replica of the r-4360 wasp major, but heavy, very heavy inspiration was taken.

g for starter, f for throttle, u to shift up, i to shift down