Radial engine cutaway - GIF

Radial engine cutaway.

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Previously:

https://www.homemadetools.net/forum/...286#post172912
https://www.homemadetools.net/forum/...085#post168585
https://www.homemadetools.net/forum/...992#post168156
https://www.homemadetools.net/forum/...387#post150781
https://www.homemadetools.net/forum/...047#post164668

Appears a Double Row Wasp type, two banks of 9 radial cylinders.
A couple generations back, they built untold but massive quantities of them.
And a large percent of the world's population gave thanks; whether they knew it or not.